Aphasias: Test the Pattern, Localize the Network, Plan the Care

1. A. Dysarthria affecting motor execution of speech (Best answer)

   Language formulation and comprehension are preserved across spoken and written tasks. Consistent slurring and imprecise articulation instead localize the problem to motor execution of speech.

   Reasoning steps for option A

   1. For aph-01 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Language formulation and comprehension are preserved across spoken and written tasks.

   2. For aph-01 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dysarthria affecting motor execution of speech is the remaining discriminator: Consistent slurring and imprecise articulation instead localize the problem to motor execution of speech.

2. B. Broca aphasia affecting grammatical language output (Why this does not fit)

   Broca aphasia would impair formulation of connected language, often producing short or agrammatic phrases. This patient can name objects and generate a complete written sentence despite poor articulation.

   Reasoning steps for option B

   1. For aph-01 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Broca aphasia would impair formulation of connected language, often producing short or agrammatic phrases.

   2. For aph-01 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Broca aphasia affecting grammatical language output is the remaining discriminator: This patient can name objects and generate a complete written sentence despite poor articulation.

3. C. Apraxia of speech affecting learned speech planning (Why this does not fit)

   Apraxia of speech often produces effortful initiation, distorted sound substitutions, and inconsistency across attempts. The repeated errors here are stable and slurred, which better fits impaired motor execution.

   Reasoning steps for option C

   1. For aph-01 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Apraxia of speech often produces effortful initiation, distorted sound substitutions, and inconsistency across attempts.

   2. For aph-01 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Apraxia of speech affecting learned speech planning is the remaining discriminator: The repeated errors here are stable and slurred, which better fits impaired motor execution.

4. D. Global aphasia affecting several language domains (Why this does not fit)

   Global aphasia severely impairs expression, comprehension, and repetition. This patient follows a complex command and demonstrates intact naming and written language.

   Reasoning steps for option D

   1. For aph-01 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Global aphasia severely impairs expression, comprehension, and repetition.

   2. For aph-01 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Global aphasia affecting several language domains is the remaining discriminator: This patient follows a complex command and demonstrates intact naming and written language.

Takeaway: Demonstrate language separately from articulation before labeling difficult speech aphasia.

Case sources: ^[1]

1. A. Broca aphasia (Why this does not fit)

   Broca aphasia can be nonfluent with relatively preserved comprehension, but repetition is usually impaired. Accurate repetition of a long unfamiliar sentence is the key discordant finding.

   Reasoning steps for option A

   1. For aph-03 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Broca aphasia can be nonfluent with relatively preserved comprehension, but repetition is usually impaired.

   2. For aph-03 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Broca aphasia is the remaining discriminator: Accurate repetition of a long unfamiliar sentence is the key discordant finding.

2. B. Anomic aphasia (Why this does not fit)

   Anomic aphasia is usually fluent, with word retrieval pauses as the predominant deficit. Markedly reduced spontaneous output does not fit that residual pattern.

   Reasoning steps for option B

   1. For aph-03 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Anomic aphasia is usually fluent, with word retrieval pauses as the predominant deficit.

   2. For aph-03 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Anomic aphasia is the remaining discriminator: Markedly reduced spontaneous output does not fit that residual pattern.

3. C. Transcortical motor aphasia (Best answer)

   Poor initiation or nonfluent output with comparatively preserved comprehension and repetition defines a transcortical motor profile. The frontal border-zone lesion supplies a compatible vascular arrangement.

   Reasoning steps for option C

   1. For aph-03 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Poor initiation or nonfluent output with comparatively preserved comprehension and repetition defines a transcortical motor profile.

   2. For aph-03 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Transcortical motor aphasia is the remaining discriminator: The frontal border-zone lesion supplies a compatible vascular arrangement.

4. D. Conduction aphasia with disproportionate repetition failure (Why this does not fit)

   Conduction aphasia is relatively fluent and is distinguished by disproportionate repetition failure. This patient shows the opposite repetition pattern.

   Reasoning steps for option D

   1. For aph-03 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Conduction aphasia is relatively fluent and is distinguished by disproportionate repetition failure.

   2. For aph-03 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Conduction aphasia with disproportionate repetition failure is the remaining discriminator: This patient shows the opposite repetition pattern.

Takeaway: Preserved repetition separates transcortical motor aphasia from a neighboring Broca profile.

Case sources: ^{[1] [8]}

1. A. Wernicke aphasia with impaired sentence repetition (Why this does not fit)

   Wernicke aphasia explains fluent output and impaired comprehension, but repetition is generally impaired. Accurate sentence repetition and echolalia identify a different profile.

   Reasoning steps for option A

   1. For aph-04 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia explains fluent output and impaired comprehension, but repetition is generally impaired.

   2. For aph-04 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wernicke aphasia with impaired sentence repetition is the remaining discriminator: Accurate sentence repetition and echolalia identify a different profile.

2. B. Conduction aphasia (Why this does not fit)

   Conduction aphasia preserves comprehension better than this and produces disproportionate repetition failure. Both defining comparisons run opposite to the findings.

   Reasoning steps for option B

   1. For aph-04 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Conduction aphasia preserves comprehension better than this and produces disproportionate repetition failure.

   2. For aph-04 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Conduction aphasia is the remaining discriminator: Both defining comparisons run opposite to the findings.

3. C. Anomic aphasia (Why this does not fit)

   Anomic aphasia preserves comprehension and repetition, with retrieval difficulty as the main deficit. Severe word-object and command comprehension failure excludes that pattern.

   Reasoning steps for option C

   1. For aph-04 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Anomic aphasia preserves comprehension and repetition, with retrieval difficulty as the main deficit.

   2. For aph-04 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Anomic aphasia is the remaining discriminator: Severe word-object and command comprehension failure excludes that pattern.

4. D. Transcortical sensory aphasia (Best answer)

   Fluent low-content output and impaired comprehension resemble a posterior language disorder, while preserved repetition identifies the transcortical sensory pattern. Echolalia can make that preservation conspicuous.

   Reasoning steps for option D

   1. For aph-04 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Fluent low-content output and impaired comprehension resemble a posterior language disorder, while preserved repetition identifies the transcortical sensory pattern.

   2. For aph-04 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Transcortical sensory aphasia is the remaining discriminator: Echolalia can make that preservation conspicuous.

Takeaway: Preserved repetition distinguishes transcortical sensory aphasia from Wernicke aphasia.

Case sources: ^{[1] [8]}

1. A. Conduction aphasia (Best answer)

   Conversational fluency and comprehension are comparatively preserved, while repetition is disproportionately impaired. Phonemic errors and successive approximations toward a target further support a conduction profile.

   Reasoning steps for option A

   1. For aph-05 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Conversational fluency and comprehension are comparatively preserved, while repetition is disproportionately impaired.

   2. For aph-05 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Conduction aphasia is the remaining discriminator: Phonemic errors and successive approximations toward a target further support a conduction profile.

2. B. Wernicke aphasia (Why this does not fit)

   Wernicke aphasia can be fluent and paraphasic, but spoken comprehension is usually substantially impaired. This patient follows complex commands reliably.

   Reasoning steps for option B

   1. For aph-05 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia can be fluent and paraphasic, but spoken comprehension is usually substantially impaired.

   2. For aph-05 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wernicke aphasia is the remaining discriminator: This patient follows complex commands reliably.

3. C. Transcortical sensory aphasia (Why this does not fit)

   Transcortical sensory aphasia combines poor comprehension with relatively preserved repetition. Both domains in this case show the reverse relationship.

   Reasoning steps for option C

   1. For aph-05 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Transcortical sensory aphasia combines poor comprehension with relatively preserved repetition.

   2. For aph-05 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Transcortical sensory aphasia is the remaining discriminator: Both domains in this case show the reverse relationship.

4. D. Apraxia of speech (Why this does not fit)

   Apraxia of speech can disrupt sound production, but it does not by itself explain a selective collapse of linguistic repetition with fluent conversation and intact comprehension. The examination describes a language-network dissociation.

   Reasoning steps for option D

   1. For aph-05 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Apraxia of speech can disrupt sound production, but it does not by itself explain a selective collapse of linguistic repetition with fluent conversation and intact comprehension.

   2. For aph-05 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Apraxia of speech is the remaining discriminator: The examination describes a language-network dissociation.

Takeaway: Disproportionate repetition failure with stronger comprehension and fluency supports conduction aphasia.

Case sources: ^{[1] [4]}

1. A. Global aphasia with severely impaired repetition (Why this does not fit)

   Global aphasia can severely impair output and comprehension, but repetition is also severely impaired. Exact repetition is the feature that argues against the global profile.

   Reasoning steps for option A

   1. For aph-06 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Global aphasia can severely impair output and comprehension, but repetition is also severely impaired.

   2. For aph-06 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Global aphasia with severely impaired repetition is the remaining discriminator: Exact repetition is the feature that argues against the global profile.

2. B. Mixed transcortical aphasia (Best answer)

   Severely limited self-generated output and poor comprehension coexist with unexpectedly preserved repetition. Echolalia after a watershed event is a classic expression of network isolation.

   Reasoning steps for option B

   1. For aph-06 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Severely limited self-generated output and poor comprehension coexist with unexpectedly preserved repetition.

   2. For aph-06 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Mixed transcortical aphasia is the remaining discriminator: Echolalia after a watershed event is a classic expression of network isolation.

3. C. Broca aphasia (Why this does not fit)

   Broca aphasia causes nonfluent output with better comprehension than shown here and usually impaired repetition. The patient has severe comprehension failure with accurate repetition.

   Reasoning steps for option C

   1. For aph-06 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Broca aphasia causes nonfluent output with better comprehension than shown here and usually impaired repetition.

   2. For aph-06 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Broca aphasia is the remaining discriminator: The patient has severe comprehension failure with accurate repetition.

4. D. Anomic aphasia (Why this does not fit)

   Anomic aphasia is fluent and preserves comprehension, with naming as the predominant weakness. It cannot account for severe deficits in spontaneous output and understanding.

   Reasoning steps for option D

   1. For aph-06 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Anomic aphasia is fluent and preserves comprehension, with naming as the predominant weakness.

   2. For aph-06 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Anomic aphasia is the remaining discriminator: It cannot account for severe deficits in spontaneous output and understanding.

Takeaway: Preserved repetition separates mixed transcortical aphasia from global aphasia.

Case sources: ^{[1] [8]}

1. A. Conduction aphasia (Why this does not fit)

   Conduction aphasia requires disproportionate repetition impairment, which is absent. Circumlocution alone does not establish that syndrome.

   Reasoning steps for option A

   1. For aph-07 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Conduction aphasia requires disproportionate repetition impairment, which is absent.

   2. For aph-07 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Conduction aphasia is the remaining discriminator: Circumlocution alone does not establish that syndrome.

2. B. Transcortical motor aphasia (Why this does not fit)

   Transcortical motor aphasia produces reduced initiation or nonfluent output. This patient speaks fluently in complete sentences.

   Reasoning steps for option B

   1. For aph-07 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Transcortical motor aphasia produces reduced initiation or nonfluent output.

   2. For aph-07 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Transcortical motor aphasia is the remaining discriminator: This patient speaks fluently in complete sentences.

3. C. Anomic aphasia (Best answer)

   Fluent grammatical speech, preserved comprehension, and preserved repetition leave word retrieval as the predominant deficit. Circumlocution is a common strategy when the target word is inaccessible.

   Reasoning steps for option C

   1. For aph-07 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Fluent grammatical speech, preserved comprehension, and preserved repetition leave word retrieval as the predominant deficit.

   2. For aph-07 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Anomic aphasia is the remaining discriminator: Circumlocution is a common strategy when the target word is inaccessible.

4. D. Wernicke aphasia (Why this does not fit)

   Wernicke aphasia includes impaired comprehension and often inaccurate content monitoring. This patient understands conversation and selects the correct target when it is supplied.

   Reasoning steps for option D

   1. For aph-07 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia includes impaired comprehension and often inaccurate content monitoring.

   2. For aph-07 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wernicke aphasia is the remaining discriminator: This patient understands conversation and selects the correct target when it is supplied.

Takeaway: Update the syndrome label as recovery leaves a predominantly anomic profile.

Case sources: ^[1]

1. A. Global aphasia (Why this does not fit)

   Global aphasia causes severe impairment across output, comprehension, and repetition. This patient understands simple commands and shows a selective syntax-sensitive comprehension deficit rather than broad comprehension failure.

   Reasoning steps for option A

   1. For aph-08 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Global aphasia causes severe impairment across output, comprehension, and repetition.

   2. For aph-08 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Global aphasia is the remaining discriminator: This patient understands simple commands and shows a selective syntax-sensitive comprehension deficit rather than broad comprehension failure.

2. B. Wernicke aphasia (Why this does not fit)

   Wernicke aphasia usually produces fluent output with a broader comprehension disorder. The nonfluent agrammatic speech and inferior frontal lesion point to an anterior profile.

   Reasoning steps for option B

   1. For aph-08 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia usually produces fluent output with a broader comprehension disorder.

   2. For aph-08 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wernicke aphasia is the remaining discriminator: The nonfluent agrammatic speech and inferior frontal lesion point to an anterior profile.

3. C. Isolated auditory processing disorder (Why this does not fit)

   An isolated auditory disorder would impair access to spoken material more consistently. The contrast between simple commands and grammatically demanding sentences indicates a language-syntax problem.

   Reasoning steps for option C

   1. For aph-08 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: An isolated auditory disorder would impair access to spoken material more consistently.

   2. For aph-08 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Isolated auditory processing disorder is the remaining discriminator: The contrast between simple commands and grammatically demanding sentences indicates a language-syntax problem.

4. D. Broca aphasia (Best answer)

   Broca aphasia often preserves simple comprehension better than language output while complex grammatical relations can still fail. Nonfluent agrammatic speech with impaired repetition supports this diagnosis.

   Reasoning steps for option D

   1. For aph-08 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Broca aphasia often preserves simple comprehension better than language output while complex grammatical relations can still fail.

   2. For aph-08 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Broca aphasia is the remaining discriminator: Nonfluent agrammatic speech with impaired repetition supports this diagnosis.

Takeaway: Broca aphasia can preserve simple comprehension while complex grammatical relations remain difficult.

Case sources: ^[1]

1. A. Dominant posterior temporal language cortex supplied by the inferior middle cerebral artery division (Best answer)

   Fluent low-content output with impaired comprehension and repetition supports a posterior perisylvian language lesion. Inferior-division involvement can occur without dense motor weakness.

   Reasoning steps for option A

   1. For aph-09 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Fluent low-content output with impaired comprehension and repetition supports a posterior perisylvian language lesion.

   2. For aph-09 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant posterior temporal language cortex supplied by the inferior middle cerebral artery division is the remaining discriminator: Inferior-division involvement can occur without dense motor weakness.

2. B. Dominant inferior frontal language cortex supplied by the superior middle cerebral artery division (Why this does not fit)

   An inferior frontal lesion is more likely to produce nonfluent, effortful, or agrammatic output. The fluent comprehension disorder points posteriorly.

   Reasoning steps for option B

   1. For aph-09 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: An inferior frontal lesion is more likely to produce nonfluent, effortful, or agrammatic output.

   2. For aph-09 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant inferior frontal language cortex supplied by the superior middle cerebral artery division is the remaining discriminator: The fluent comprehension disorder points posteriorly.

3. C. Nondominant parietal association cortex causing hemispatial neglect (Why this does not fit)

   Neglect can impair attention to one side of space but does not explain fluent neologistic speech with impaired spoken comprehension and repetition. The language profile localizes to the dominant hemisphere.

   Reasoning steps for option C

   1. For aph-09 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Neglect can impair attention to one side of space but does not explain fluent neologistic speech with impaired spoken comprehension and repetition.

   2. For aph-09 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Nondominant parietal association cortex causing hemispatial neglect is the remaining discriminator: The language profile localizes to the dominant hemisphere.

4. D. Bilateral corticobulbar pathways causing pseudobulbar dysarthria (Why this does not fit)

   Bilateral corticobulbar injury can alter articulation and emotional expression. It does not account for fluent language that lacks meaning or for failure of comprehension.

   Reasoning steps for option D

   1. For aph-09 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Bilateral corticobulbar injury can alter articulation and emotional expression.

   2. For aph-09 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Bilateral corticobulbar pathways causing pseudobulbar dysarthria is the remaining discriminator: It does not account for fluent language that lacks meaning or for failure of comprehension.

Takeaway: Posterior dominant language injury can produce severe aphasia without dense hemiparesis.

Case sources: ^[8]

1. A. Inferior division of the dominant middle cerebral artery (Why this does not fit)

   Inferior-division injury is more strongly associated with posterior temporal language dysfunction and often lacks dense face-arm weakness. The speech profile and motor pattern point anteriorly.

   Reasoning steps for option A

   1. For aph-10 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Inferior-division injury is more strongly associated with posterior temporal language dysfunction and often lacks dense face-arm weakness.

   2. For aph-10 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Inferior division of the dominant middle cerebral artery is the remaining discriminator: The speech profile and motor pattern point anteriorly.

2. B. Superior division of the dominant middle cerebral artery (Best answer)

   The nonfluent agrammatic profile localizes to dominant inferior frontal language regions. Right face and arm weakness with relative leg sparing is compatible with adjacent lateral frontal motor cortex injury in the superior division.

   Reasoning steps for option B

   1. For aph-10 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The nonfluent agrammatic profile localizes to dominant inferior frontal language regions.

   2. For aph-10 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Superior division of the dominant middle cerebral artery is the remaining discriminator: Right face and arm weakness with relative leg sparing is compatible with adjacent lateral frontal motor cortex injury in the superior division.

3. C. Dominant posterior cerebral artery (Why this does not fit)

   Dominant posterior cerebral artery injury can affect reading, memory, or posterior language pathways. It does not best fit the combined inferior frontal language pattern and lateral face-arm motor deficit.

   Reasoning steps for option C

   1. For aph-10 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Dominant posterior cerebral artery injury can affect reading, memory, or posterior language pathways.

   2. For aph-10 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant posterior cerebral artery is the remaining discriminator: It does not best fit the combined inferior frontal language pattern and lateral face-arm motor deficit.

4. D. Dominant anterior cerebral artery (Why this does not fit)

   Anterior cerebral artery injury more often affects medial frontal structures and the contralateral leg. The prominent face-arm weakness and inferior frontal language findings fit a lateral middle cerebral artery distribution.

   Reasoning steps for option D

   1. For aph-10 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Anterior cerebral artery injury more often affects medial frontal structures and the contralateral leg.

   2. For aph-10 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant anterior cerebral artery is the remaining discriminator: The prominent face-arm weakness and inferior frontal language findings fit a lateral middle cerebral artery distribution.

Takeaway: Combine the language profile with the motor distribution when forming a vascular hypothesis.

Case sources: ^[8]

1. A. Posterior temporal language cortex (Why this does not fit)

   Posterior temporal injury usually impairs comprehension and can produce fluent low-content speech. Comprehension and repetition are both strong here.

   Reasoning steps for option A

   1. For aph-11 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Posterior temporal injury usually impairs comprehension and can produce fluent low-content speech.

   2. For aph-11 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Posterior temporal language cortex is the remaining discriminator: Comprehension and repetition are both strong here.

2. B. Dorsal temporoparietal repetition network (Why this does not fit)

   Damage to the dorsal repetition network would be expected to impair repetition disproportionately. Accurate long-sentence repetition argues against that localization.

   Reasoning steps for option B

   1. For aph-11 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Damage to the dorsal repetition network would be expected to impair repetition disproportionately.

   2. For aph-11 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dorsal temporoparietal repetition network is the remaining discriminator: Accurate long-sentence repetition argues against that localization.

3. C. Dominant frontal border-zone or medial frontal language network (Best answer)

   Hypoperfusion can affect frontal border-zone or medial frontal regions that support initiation. Sparse self-generated speech with preserved comprehension and repetition fits a transcortical motor profile.

   Reasoning steps for option C

   1. For aph-11 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Hypoperfusion can affect frontal border-zone or medial frontal regions that support initiation.

   2. For aph-11 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant frontal border-zone or medial frontal language network is the remaining discriminator: Sparse self-generated speech with preserved comprehension and repetition fits a transcortical motor profile.

4. D. Left occipital cortex and posterior callosal fibers (Why this does not fit)

   That combination is associated with a reading disconnection, often with preserved writing. It does not explain selective loss of speech initiation with intact repetition.

   Reasoning steps for option D

   1. For aph-11 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: That combination is associated with a reading disconnection, often with preserved writing.

   2. For aph-11 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Left occipital cortex and posterior callosal fibers is the remaining discriminator: It does not explain selective loss of speech initiation with intact repetition.

Takeaway: After hypotension, sparse output with preserved repetition suggests a frontal border-zone profile.

Case sources: ^[8]

1. A. Dominant inferior frontal injury (Why this does not fit)

   Inferior frontal injury usually produces nonfluent or agrammatic output. This patient is fluent and has marked comprehension failure.

   Reasoning steps for option A

   1. For aph-12 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Inferior frontal injury usually produces nonfluent or agrammatic output.

   2. For aph-12 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant inferior frontal injury is the remaining discriminator: This patient is fluent and has marked comprehension failure.

2. B. Dominant dorsal temporoparietal injury (Why this does not fit)

   Dorsal temporoparietal injury is associated with disproportionate repetition impairment. Repetition is preserved in this case.

   Reasoning steps for option B

   1. For aph-12 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Dorsal temporoparietal injury is associated with disproportionate repetition impairment.

   2. For aph-12 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant dorsal temporoparietal injury is the remaining discriminator: Repetition is preserved in this case.

3. C. Large dominant perisylvian infarction (Why this does not fit)

   A large perisylvian infarct can produce global aphasia with severe impairment of repetition. Preserved sentence repetition argues for relative sparing of the central perisylvian network.

   Reasoning steps for option C

   1. For aph-12 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A large perisylvian infarct can produce global aphasia with severe impairment of repetition.

   2. For aph-12 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Large dominant perisylvian infarction is the remaining discriminator: Preserved sentence repetition argues for relative sparing of the central perisylvian network.

4. D. Dominant posterior border-zone injury (Best answer)

   Posterior border-zone injury can impair comprehension while leaving repetition comparatively preserved. The hypotensive setting and fluent transcortical sensory profile support this arrangement.

   Reasoning steps for option D

   1. For aph-12 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Posterior border-zone injury can impair comprehension while leaving repetition comparatively preserved.

   2. For aph-12 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant posterior border-zone injury is the remaining discriminator: The hypotensive setting and fluent transcortical sensory profile support this arrangement.

Takeaway: Posterior border-zone injury can mimic Wernicke aphasia while preserving repetition.

Case sources: ^[8]

1. A. The core perisylvian language network is relatively spared but isolated from surrounding association cortex (Best answer)

   Preserved repetition suggests that central perisylvian language pathways remain relatively available. Extensive surrounding watershed injury can isolate that network, producing a mixed transcortical profile.

   Reasoning steps for option A

   1. For aph-13 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Preserved repetition suggests that central perisylvian language pathways remain relatively available.

   2. For aph-13 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The core perisylvian language network is relatively spared but isolated from surrounding association cortex is the remaining discriminator: Extensive surrounding watershed injury can isolate that network, producing a mixed transcortical profile.

2. B. The entire dominant perisylvian network is destroyed (Why this does not fit)

   Destruction of the entire perisylvian network would severely impair repetition as part of a global profile. Accurate sentence repetition is inconsistent with complete destruction.

   Reasoning steps for option B

   1. For aph-13 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Destruction of the entire perisylvian network would severely impair repetition as part of a global profile.

   2. For aph-13 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The entire dominant perisylvian network is destroyed is the remaining discriminator: Accurate sentence repetition is inconsistent with complete destruction.

3. C. A pure motor speech disorder prevents all self-generated language (Why this does not fit)

   A motor speech disorder would also affect repeated speech unless a highly specific dissociation were demonstrated. Here repetition is clear while comprehension and naming are severely impaired, indicating language dysfunction.

   Reasoning steps for option C

   1. For aph-13 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A motor speech disorder would also affect repeated speech unless a highly specific dissociation were demonstrated.

   2. For aph-13 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for A pure motor speech disorder prevents all self-generated language is the remaining discriminator: Here repetition is clear while comprehension and naming are severely impaired, indicating language dysfunction.

4. D. A posterior visual pathway lesion prevents understanding spoken commands (Why this does not fit)

   A posterior visual lesion can impair reading or visual fields but does not explain failure of spoken comprehension and naming. The preserved repetition with severe language deficits points to network isolation.

   Reasoning steps for option D

   1. For aph-13 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A posterior visual lesion can impair reading or visual fields but does not explain failure of spoken comprehension and naming.

   2. For aph-13 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for A posterior visual pathway lesion prevents understanding spoken commands is the remaining discriminator: The preserved repetition with severe language deficits points to network isolation.

Takeaway: Mixed transcortical aphasia reflects severe surrounding injury with relative preservation of repetition pathways.

Case sources: ^[8]

1. A. The aphasia must be psychogenic because cortex is intact (Why this does not fit)

   Aphasia can arise from subcortical injury through disruption of connected language networks. Absence of a cortical infarct does not make the deficit psychogenic.

   Reasoning steps for option A

   1. For aph-14 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Aphasia can arise from subcortical injury through disruption of connected language networks.

   2. For aph-14 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The aphasia must be psychogenic because cortex is intact is the remaining discriminator: Absence of a cortical infarct does not make the deficit psychogenic.

2. B. Dominant thalamic injury can produce aphasia through network disruption (Best answer)

   The thalamus participates in distributed cortical-subcortical systems. A dominant thalamic lesion can alter language through network dysfunction even when classical cortical regions appear structurally intact.

   Reasoning steps for option B

   1. For aph-14 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The thalamus participates in distributed cortical-subcortical systems.

   2. For aph-14 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant thalamic injury can produce aphasia through network disruption is the remaining discriminator: A dominant thalamic lesion can alter language through network dysfunction even when classical cortical regions appear structurally intact.

3. C. The lesion proves a fixed Wernicke profile with predictable abilities (Why this does not fit)

   A fluent comprehension disorder can resemble a posterior cortical profile, but the observed domains should be documented directly. A lesion site does not guarantee every feature of a named syndrome.

   Reasoning steps for option C

   1. For aph-14 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A fluent comprehension disorder can resemble a posterior cortical profile, but the observed domains should be documented directly.

   2. For aph-14 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The lesion proves a fixed Wernicke profile with predictable abilities is the remaining discriminator: A lesion site does not guarantee every feature of a named syndrome.

4. D. Only middle cerebral artery lesions can cause acquired aphasia (Why this does not fit)

   Language dysfunction can follow dominant thalamic, anterior cerebral, posterior cerebral, or other subcortical lesions. Restricting aphasia to one arterial territory is too narrow.

   Reasoning steps for option D

   1. For aph-14 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Language dysfunction can follow dominant thalamic, anterior cerebral, posterior cerebral, or other subcortical lesions.

   2. For aph-14 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Only middle cerebral artery lesions can cause acquired aphasia is the remaining discriminator: Restricting aphasia to one arterial territory is too narrow.

Takeaway: Language localization is network based; subcortical lesions can produce genuine aphasia.

Case sources: ^{[1] [8] [9]}

1. A. Global aphasia caused by a typical left-dominant network (Why this does not fit)

   The domain profile may be global in severity, but the causative lesion is in the right hemisphere. A typical left-dominant description does not account for the observed lateralization.

   Reasoning steps for option A

   1. For aph-15 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The domain profile may be global in severity, but the causative lesion is in the right hemisphere.

   2. For aph-15 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Global aphasia caused by a typical left-dominant network is the remaining discriminator: A typical left-dominant description does not account for the observed lateralization.

2. B. Bilateral language representation established solely by the patient's right-handedness (Why this does not fit)

   Right-handedness increases the probability of left dominance but does not establish bilateral representation. The deficit after a unilateral right lesion supports atypical right-sided language organization.

   Reasoning steps for option B

   1. For aph-15 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Right-handedness increases the probability of left dominance but does not establish bilateral representation.

   2. For aph-15 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Bilateral language representation established solely by the patient's right-handedness is the remaining discriminator: The deficit after a unilateral right lesion supports atypical right-sided language organization.

3. C. Crossed aphasia after a right-hemisphere lesion in a right-handed person (Best answer)

   Crossed aphasia classically refers to aphasia from a right-hemisphere lesion in a right-handed person. The broad acquired language impairment and adequate sensory access support that label.

   Reasoning steps for option C

   1. For aph-15 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Crossed aphasia classically refers to aphasia from a right-hemisphere lesion in a right-handed person.

   2. For aph-15 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Crossed aphasia after a right-hemisphere lesion in a right-handed person is the remaining discriminator: The broad acquired language impairment and adequate sensory access support that label.

4. D. Nondominant neglect misclassified as a language disorder (Why this does not fit)

   Neglect can impair exploration and response, but it does not explain deficits across spoken comprehension, repetition, reading, and writing when attention and sensory access are adequate. The pattern demonstrates acquired language dysfunction.

   Reasoning steps for option D

   1. For aph-15 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Neglect can impair exploration and response, but it does not explain deficits across spoken comprehension, repetition, reading, and writing when attention and sensory access are adequate.

   2. For aph-15 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Nondominant neglect misclassified as a language disorder is the remaining discriminator: The pattern demonstrates acquired language dysfunction.

Takeaway: Handedness changes the probability of language dominance but does not determine it.

Case sources: ^{[1] [5]}

1. A. Phonemic paraphasia followed by echolalia (Why this does not fit)

   A phonemic paraphasia changes the sound structure of a target, while echolalia repeats another person's utterance. Neither label matches the related-word substitution plus descriptive workaround.

   Reasoning steps for option A

   1. For aph-16 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A phonemic paraphasia changes the sound structure of a target, while echolalia repeats another person's utterance.

   2. For aph-16 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Phonemic paraphasia followed by echolalia is the remaining discriminator: Neither label matches the related-word substitution plus descriptive workaround.

2. B. Neologism and perseveration (Why this does not fit)

   A neologism is a novel nonword, and perseveration repeats a prior response inappropriately. 'Fork' is a real related word, and the second response is a description rather than repetition.

   Reasoning steps for option B

   1. For aph-16 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A neologism is a novel nonword, and perseveration repeats a prior response inappropriately.

   2. For aph-16 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Neologism and perseveration is the remaining discriminator: 'Fork' is a real related word, and the second response is a description rather than repetition.

3. C. Semantic paraphasia and neologism (Why this does not fit)

   Calling a spoon a fork is a semantic paraphasia, but the description of a watch is not a nonword. The second behavior is a meaningful description used when the target name is unavailable.

   Reasoning steps for option C

   1. For aph-16 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Calling a spoon a fork is a semantic paraphasia, but the description of a watch is not a nonword.

   2. For aph-16 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Semantic paraphasia and neologism is the remaining discriminator: The second behavior is a meaningful description used when the target name is unavailable.

4. D. Semantic paraphasia and circumlocution (Best answer)

   The first response substitutes a meaning-related real word, which is a semantic paraphasia. The second conveys the target through description, which is circumlocution.

   Reasoning steps for option D

   1. For aph-16 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The first response substitutes a meaning-related real word, which is a semantic paraphasia.

   2. For aph-16 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Semantic paraphasia and circumlocution is the remaining discriminator: The second conveys the target through description, which is circumlocution.

Takeaway: Describe the error itself before using it to support a broader language profile.

Case sources: ^[1]

1. A. Left occipital cortex plus posterior callosal fibers (Best answer)

   Left occipital injury limits direct visual input to the dominant hemisphere, while posterior callosal injury interrupts transfer from the right visual cortex. Written language generation can remain available despite severe reading failure.

   Reasoning steps for option A

   1. For aph-17 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Left occipital injury limits direct visual input to the dominant hemisphere, while posterior callosal injury interrupts transfer from the right visual cortex.

   2. For aph-17 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Left occipital cortex plus posterior callosal fibers is the remaining discriminator: Written language generation can remain available despite severe reading failure.

2. B. Dominant inferior frontal cortex plus premotor speech regions (Why this does not fit)

   Inferior frontal and premotor injury would be expected to impair spoken formulation or speech planning. Those functions are preserved, and the dominant deficit is visual word recognition.

   Reasoning steps for option B

   1. For aph-17 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Inferior frontal and premotor injury would be expected to impair spoken formulation or speech planning.

   2. For aph-17 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant inferior frontal cortex plus premotor speech regions is the remaining discriminator: Those functions are preserved, and the dominant deficit is visual word recognition.

3. C. Dominant angular region plus adjacent inferior parietal cortex (Why this does not fit)

   Angular-region dysfunction can impair both reading and writing. Preserved writing despite inability to read favors a disconnection pattern rather than alexia with agraphia.

   Reasoning steps for option C

   1. For aph-17 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Angular-region dysfunction can impair both reading and writing.

   2. For aph-17 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant angular region plus adjacent inferior parietal cortex is the remaining discriminator: Preserved writing despite inability to read favors a disconnection pattern rather than alexia with agraphia.

4. D. Bilateral auditory cortex plus posterior temporal language regions (Why this does not fit)

   Bilateral auditory injury would impair access to spoken language, and posterior temporal injury could impair comprehension. Dictation, spoken comprehension, and repetition are preserved here.

   Reasoning steps for option D

   1. For aph-17 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Bilateral auditory injury would impair access to spoken language, and posterior temporal injury could impair comprehension.

   2. For aph-17 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Bilateral auditory cortex plus posterior temporal language regions is the remaining discriminator: Dictation, spoken comprehension, and repetition are preserved here.

Takeaway: Pure alexia can result from left occipital injury combined with interrupted visual transfer to the dominant reading network.

Case sources: ^[6]

1. A. The field deficit is sufficient to diagnose pure alexia (Why this does not fit)

   A visual field deficit can slow reading and require compensatory scanning. Pure alexia requires a disproportionate visual word-recognition disorder, not merely missing visual space.

   Reasoning steps for option A

   1. For aph-18 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A visual field deficit can slow reading and require compensatory scanning.

   2. For aph-18 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The field deficit is sufficient to diagnose pure alexia is the remaining discriminator: Pure alexia requires a disproportionate visual word-recognition disorder, not merely missing visual space.

2. B. Field loss without the full pure-alexia dissociation (Best answer)

   Reading remains accurate with a scanning strategy, and writing is normal. The field deficit alone does not demonstrate disruption of visual access to the dominant reading network.

   Reasoning steps for option B

   1. For aph-18 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Reading remains accurate with a scanning strategy, and writing is normal.

   2. For aph-18 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Field loss without the full pure-alexia dissociation is the remaining discriminator: The field deficit alone does not demonstrate disruption of visual access to the dominant reading network.

3. C. The patient has alexia with agraphia from angular-region injury (Why this does not fit)

   Alexia with agraphia impairs both reading and writing. Both are substantially preserved in this case.

   Reasoning steps for option C

   1. For aph-18 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Alexia with agraphia impairs both reading and writing.

   2. For aph-18 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The patient has alexia with agraphia from angular-region injury is the remaining discriminator: Both are substantially preserved in this case.

4. D. The patient has Wernicke aphasia limited to written language (Why this does not fit)

   Wernicke aphasia includes impaired spoken comprehension and fluent language disturbance. Spoken language is normal, and the reading difficulty is explained by the visual field deficit.

   Reasoning steps for option D

   1. For aph-18 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia includes impaired spoken comprehension and fluent language disturbance.

   2. For aph-18 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for The patient has Wernicke aphasia limited to written language is the remaining discriminator: Spoken language is normal, and the reading difficulty is explained by the visual field deficit.

Takeaway: A visual field deficit can hinder reading without producing pure alexia.

Case sources: ^[6]

1. A. Dominant posterior temporal cortex (Why this does not fit)

   Posterior temporal injury can impair spoken comprehension, which is comparatively preserved. The combined reading, writing, calculation, finger, and laterality deficits point elsewhere.

   Reasoning steps for option A

   1. For aph-19 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Posterior temporal injury can impair spoken comprehension, which is comparatively preserved.

   2. For aph-19 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant posterior temporal cortex is the remaining discriminator: The combined reading, writing, calculation, finger, and laterality deficits point elsewhere.

2. B. Left occipital cortex and posterior callosal fibers (Why this does not fit)

   That disconnection can impair reading while preserving writing. Writing is impaired here, and the additional calculation and body-schema findings are not explained.

   Reasoning steps for option B

   1. For aph-19 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: That disconnection can impair reading while preserving writing.

   2. For aph-19 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Left occipital cortex and posterior callosal fibers is the remaining discriminator: Writing is impaired here, and the additional calculation and body-schema findings are not explained.

3. C. Dominant angular and inferior parietal region (Best answer)

   Alexia with agraphia plus acalculia, finger agnosia, and left-right disorientation forms the classic Gerstmann cluster. This constellation supports dominant inferior parietal localization.

   Reasoning steps for option C

   1. For aph-19 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Alexia with agraphia plus acalculia, finger agnosia, and left-right disorientation forms the classic Gerstmann cluster.

   2. For aph-19 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant angular and inferior parietal region is the remaining discriminator: This constellation supports dominant inferior parietal localization.

4. D. Dominant inferior frontal language cortex (Why this does not fit)

   Inferior frontal injury would more strongly affect fluent formulation, grammar, and repetition. It does not best integrate the written-language and parietal association deficits.

   Reasoning steps for option D

   1. For aph-19 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Inferior frontal injury would more strongly affect fluent formulation, grammar, and repetition.

   2. For aph-19 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Dominant inferior frontal language cortex is the remaining discriminator: It does not best integrate the written-language and parietal association deficits.

Takeaway: Alexia with agraphia and the Gerstmann cluster support dominant inferior parietal localization.

Case sources: ^[7]

1. A. Semantic variant primary progressive aphasia (Why this does not fit)

   The semantic variant causes loss of single-word meaning and object knowledge, often with fluent grammatical speech. Those semantic abilities remain strong in this patient.

   Reasoning steps for option A

   1. For aph-20 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The semantic variant causes loss of single-word meaning and object knowledge, often with fluent grammatical speech.

   2. For aph-20 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Semantic variant primary progressive aphasia is the remaining discriminator: Those semantic abilities remain strong in this patient.

2. B. Nonfluent or agrammatic primary progressive aphasia (Why this does not fit)

   The nonfluent or agrammatic variant requires agrammatism or effortful apraxic speech as a core feature. Speech is articulated and grammatical here.

   Reasoning steps for option B

   1. For aph-20 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The nonfluent or agrammatic variant requires agrammatism or effortful apraxic speech as a core feature.

   2. For aph-20 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Nonfluent or agrammatic primary progressive aphasia is the remaining discriminator: Speech is articulated and grammatical here.

3. C. Transcortical motor aphasia from an acute border-zone infarct (Why this does not fit)

   Transcortical motor aphasia has reduced initiation with preserved repetition and follows an acquired lesion. The course is progressive, and sentence repetition is impaired.

   Reasoning steps for option C

   1. For aph-20 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Transcortical motor aphasia has reduced initiation with preserved repetition and follows an acquired lesion.

   2. For aph-20 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Transcortical motor aphasia from an acute border-zone infarct is the remaining discriminator: The course is progressive, and sentence repetition is impaired.

4. D. Logopenic variant primary progressive aphasia (Best answer)

   Progressive word-retrieval pauses and impaired phrase or sentence repetition, with preserved single-word meaning and no frank agrammatism, define the logopenic profile. The posterior temporal-inferior parietal atrophy supports it.

   Reasoning steps for option D

   1. For aph-20 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Progressive word-retrieval pauses and impaired phrase or sentence repetition, with preserved single-word meaning and no frank agrammatism, define the logopenic profile.

   2. For aph-20 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Logopenic variant primary progressive aphasia is the remaining discriminator: The posterior temporal-inferior parietal atrophy supports it.

Takeaway: Logopenic primary progressive aphasia combines retrieval pauses with impaired sentence repetition and preserved early word meaning.

Case sources: ^[2]

1. A. Semantic variant primary progressive aphasia (Best answer)

   Progressive loss of single-word meaning and object knowledge is central to the semantic variant. Fluent grammar, relatively preserved repetition, and anterior temporal atrophy reinforce the profile.

   Reasoning steps for option A

   1. For aph-21 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Progressive loss of single-word meaning and object knowledge is central to the semantic variant.

   2. For aph-21 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Semantic variant primary progressive aphasia is the remaining discriminator: Fluent grammar, relatively preserved repetition, and anterior temporal atrophy reinforce the profile.

2. B. Logopenic variant primary progressive aphasia (Why this does not fit)

   The logopenic variant preserves single-word meaning early and prominently impairs phrase or sentence repetition. This patient shows the opposite semantic-repetition relationship.

   Reasoning steps for option B

   1. For aph-21 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The logopenic variant preserves single-word meaning early and prominently impairs phrase or sentence repetition.

   2. For aph-21 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Logopenic variant primary progressive aphasia is the remaining discriminator: This patient shows the opposite semantic-repetition relationship.

3. C. Conduction aphasia from a focal dorsal network lesion (Why this does not fit)

   Conduction aphasia is an acquired profile with disproportionate repetition impairment and relatively preserved comprehension. The gradual semantic loss and preserved repetition do not fit.

   Reasoning steps for option C

   1. For aph-21 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Conduction aphasia is an acquired profile with disproportionate repetition impairment and relatively preserved comprehension.

   2. For aph-21 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Conduction aphasia from a focal dorsal network lesion is the remaining discriminator: The gradual semantic loss and preserved repetition do not fit.

4. D. Nonfluent or agrammatic primary progressive aphasia (Why this does not fit)

   The nonfluent or agrammatic variant features agrammatism or effortful apraxic speech. Output remains fluent and grammatical here.

   Reasoning steps for option D

   1. For aph-21 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The nonfluent or agrammatic variant features agrammatism or effortful apraxic speech.

   2. For aph-21 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Nonfluent or agrammatic primary progressive aphasia is the remaining discriminator: Output remains fluent and grammatical here.

Takeaway: Progressive loss of word meaning and object knowledge with fluent speech supports the semantic variant.

Case sources: ^[2]

1. A. Logopenic variant primary progressive aphasia with impaired repetition (Why this does not fit)

   Logopenic disease produces retrieval pauses and impaired sentence repetition without prominent agrammatism or apraxic speech early. The grammatical and motor-speech findings here are more anterior.

   Reasoning steps for option A

   1. For aph-22 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Logopenic disease produces retrieval pauses and impaired sentence repetition without prominent agrammatism or apraxic speech early.

   2. For aph-22 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Logopenic variant primary progressive aphasia with impaired repetition is the remaining discriminator: The grammatical and motor-speech findings here are more anterior.

2. B. Nonfluent or agrammatic primary progressive aphasia (Best answer)

   Agrammatism or effortful apraxic speech is central to this variant. Preserved single-word comprehension and posterior frontal-insular atrophy support the same classification.

   Reasoning steps for option B

   1. For aph-22 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Agrammatism or effortful apraxic speech is central to this variant.

   2. For aph-22 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Nonfluent or agrammatic primary progressive aphasia is the remaining discriminator: Preserved single-word comprehension and posterior frontal-insular atrophy support the same classification.

3. C. Semantic variant primary progressive aphasia (Why this does not fit)

   The semantic variant primarily impairs word meaning and object knowledge while speech often remains fluent and grammatical. Those defining semantic deficits are absent.

   Reasoning steps for option C

   1. For aph-22 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The semantic variant primarily impairs word meaning and object knowledge while speech often remains fluent and grammatical.

   2. For aph-22 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Semantic variant primary progressive aphasia is the remaining discriminator: Those defining semantic deficits are absent.

4. D. Wernicke aphasia after an acute posterior lesion (Why this does not fit)

   Wernicke aphasia is abrupt and fluent, with impaired comprehension. This case is progressive, nonfluent, and relatively preserves single-word meaning.

   Reasoning steps for option D

   1. For aph-22 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Wernicke aphasia is abrupt and fluent, with impaired comprehension.

   2. For aph-22 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wernicke aphasia after an acute posterior lesion is the remaining discriminator: This case is progressive, nonfluent, and relatively preserves single-word meaning.

Takeaway: Effortful agrammatic language or apraxic speech with frontal-insular atrophy supports the nonfluent variant.

Case sources: ^[2]

1. A. Explain that the phenotype alone proves Alzheimer pathology (Why this does not fit)

   Logopenic presentations are often associated with Alzheimer pathology, but a clinical phenotype does not establish the biological cause in an individual. Additional etiologic evidence is required.

   Reasoning steps for option A

   1. For aph-23 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Logopenic presentations are often associated with Alzheimer pathology, but a clinical phenotype does not establish the biological cause in an individual.

   2. For aph-23 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Explain that the phenotype alone proves Alzheimer pathology is the remaining discriminator: Additional etiologic evidence is required.

2. B. Explain that the phenotype alone proves frontotemporal lobar degeneration (Why this does not fit)

   Several biological processes can produce progressive language syndromes. The logopenic profile does not uniquely establish frontotemporal lobar degeneration.

   Reasoning steps for option B

   1. For aph-23 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Several biological processes can produce progressive language syndromes.

   2. For aph-23 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Explain that the phenotype alone proves frontotemporal lobar degeneration is the remaining discriminator: The logopenic profile does not uniquely establish frontotemporal lobar degeneration.

3. C. Explain that the syndrome is classified clinically while etiology requires separate evidence (Best answer)

   The language and imaging findings support a logopenic syndrome. Biomarkers, genetics, or pathology are needed when a specific biological cause must be established.

   Reasoning steps for option C

   1. For aph-23 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The language and imaging findings support a logopenic syndrome.

   2. For aph-23 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Explain that the syndrome is classified clinically while etiology requires separate evidence is the remaining discriminator: Biomarkers, genetics, or pathology are needed when a specific biological cause must be established.

4. D. Defer every syndrome classification until tissue pathology is available (Why this does not fit)

   Primary progressive aphasia variants can be classified clinically and can receive imaging support before pathology is known. Tissue confirmation is a separate level of etiologic certainty.

   Reasoning steps for option D

   1. For aph-23 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Primary progressive aphasia variants can be classified clinically and can receive imaging support before pathology is known.

   2. For aph-23 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Defer every syndrome classification until tissue pathology is available is the remaining discriminator: Tissue confirmation is a separate level of etiologic certainty.

Takeaway: A progressive language phenotype supports syndrome classification but does not by itself prove pathology.

Case sources: ^[2]

1. A. Assess decision-specific capacity using supported communication (Best answer)

   Aphasia limits expression but does not establish incapacity. The patient demonstrates understanding and a stable choice when communication barriers are reduced, so direct supported assessment is appropriate.

   Reasoning steps for option A

   1. For aph-25 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Aphasia limits expression but does not establish incapacity.

   2. For aph-25 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Assess decision-specific capacity using supported communication is the remaining discriminator: The patient demonstrates understanding and a stable choice when communication barriers are reduced, so direct supported assessment is appropriate.

2. B. Accept the relative's answer because fluent speech is required for consent (Why this does not fit)

   Consent requires decision-specific understanding and voluntary choice, not fluent speech. The patient is already demonstrating comprehension through accessible responses.

   Reasoning steps for option B

   1. For aph-25 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Consent requires decision-specific understanding and voluntary choice, not fluent speech.

   2. For aph-25 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Accept the relative's answer because fluent speech is required for consent is the remaining discriminator: The patient is already demonstrating comprehension through accessible responses.

3. C. Assume incapacity until spoken naming and repetition normalize (Why this does not fit)

   Naming and repetition are language functions, not universal measures of decision-making capacity. Delaying participation until recovery would wrongly equate aphasia with global cognitive failure.

   Reasoning steps for option C

   1. For aph-25 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Naming and repetition are language functions, not universal measures of decision-making capacity.

   2. For aph-25 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Assume incapacity until spoken naming and repetition normalize is the remaining discriminator: Delaying participation until recovery would wrongly equate aphasia with global cognitive failure.

4. D. Cancel all decisions because picture-supported responses are invalid (Why this does not fit)

   Accessible communication methods can reveal understanding and preferences. Their use should be documented and checked for consistency rather than dismissed.

   Reasoning steps for option D

   1. For aph-25 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Accessible communication methods can reveal understanding and preferences.

   2. For aph-25 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Cancel all decisions because picture-supported responses are invalid is the remaining discriminator: Their use should be documented and checked for consistency rather than dismissed.

Takeaway: Aphasia requires communication support, not automatic removal of the patient from decisions.

Case sources: ^[1]

1. A. Diagnose a postictal state and omit brain imaging (Why this does not fit)

   Improvement after a seizure supports a postictal explanation, but seizure can accompany acute structural injury. Omission of imaging would leave a time-sensitive vascular or other lesion unassessed.

   Reasoning steps for option A

   1. For aph-26 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Improvement after a seizure supports a postictal explanation, but seizure can accompany acute structural injury.

   2. For aph-26 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Diagnose a postictal state and omit brain imaging is the remaining discriminator: Omission of imaging would leave a time-sensitive vascular or other lesion unassessed.

2. B. Treat the event as an urgent neurologic presentation while evaluating seizure and stroke in parallel (Best answer)

   The witnessed seizure and improving deficit make a postictal state plausible, but they do not exclude acute ischemia or hemorrhage. Urgent imaging and time-course assessment should proceed while seizure-related causes are evaluated.

   Reasoning steps for option B

   1. For aph-26 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: The witnessed seizure and improving deficit make a postictal state plausible, but they do not exclude acute ischemia or hemorrhage.

   2. For aph-26 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Treat the event as an urgent neurologic presentation while evaluating seizure and stroke in parallel is the remaining discriminator: Urgent imaging and time-course assessment should proceed while seizure-related causes are evaluated.

3. C. Exclude ischemia because the language deficit is improving (Why this does not fit)

   Transient or improving deficits can still reflect cerebral ischemia. Improvement changes the differential but does not safely remove stroke from consideration.

   Reasoning steps for option C

   1. For aph-26 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Transient or improving deficits can still reflect cerebral ischemia.

   2. For aph-26 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Exclude ischemia because the language deficit is improving is the remaining discriminator: Improvement changes the differential but does not safely remove stroke from consideration.

4. D. Wait for complete language recovery before establishing the onset history (Why this does not fit)

   Onset and last-known-well information are time-sensitive and should be gathered immediately from witnesses and records. Waiting can erase eligibility information without resolving the cause.

   Reasoning steps for option D

   1. For aph-26 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Onset and last-known-well information are time-sensitive and should be gathered immediately from witnesses and records.

   2. For aph-26 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Wait for complete language recovery before establishing the onset history is the remaining discriminator: Waiting can erase eligibility information without resolving the cause.

Takeaway: Seizure can mimic or accompany stroke, so urgent evaluation should address both possibilities.

Case sources: ^[3]

1. A. Diagnose Wernicke aphasia from the English comprehension errors (Why this does not fit)

   Poor performance in a less proficient language can mimic acquired comprehension failure. The reported Spanish conversation makes an English-only syndrome label unreliable.

   Reasoning steps for option A

   1. For aph-28 option A, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Poor performance in a less proficient language can mimic acquired comprehension failure.

   2. For aph-28 option A, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Diagnose Wernicke aphasia from the English comprehension errors is the remaining discriminator: The reported Spanish conversation makes an English-only syndrome label unreliable.

2. B. Diagnose anomic aphasia because naming is impaired in English (Why this does not fit)

   Naming in one nonpreferred language does not establish a selective acquired retrieval disorder. Premorbid proficiency and performance across the patient's languages must be considered.

   Reasoning steps for option B

   1. For aph-28 option B, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Naming in one nonpreferred language does not establish a selective acquired retrieval disorder.

   2. For aph-28 option B, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Diagnose anomic aphasia because naming is impaired in English is the remaining discriminator: Premorbid proficiency and performance across the patient's languages must be considered.

3. C. Repeat the same English tasks more loudly (Why this does not fit)

   Increased volume addresses hearing access, not language proficiency. The conflict between English testing and reported Spanish function requires a linguistically appropriate assessment.

   Reasoning steps for option C

   1. For aph-28 option C, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: Increased volume addresses hearing access, not language proficiency.

   2. For aph-28 option C, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Repeat the same English tasks more loudly is the remaining discriminator: The conflict between English testing and reported Spanish function requires a linguistically appropriate assessment.

4. D. Assess the languages used before illness with trained language support and document accommodations (Best answer)

   A valid assessment should sample the patient's relevant languages and distinguish premorbid proficiency from new impairment. Trained interpretation or bilingual speech-language evaluation can clarify the true pattern.

   Reasoning steps for option D

   1. For aph-28 option D, which domain-level observation must be checked first?

      Map the option back to the observed abilities before naming a syndrome: A valid assessment should sample the patient's relevant languages and distinguish premorbid proficiency from new impairment.

   2. For aph-28 option D, which case-specific contrast decides whether the choice fits?

      The decisive comparison for Assess the languages used before illness with trained language support and document accommodations is the remaining discriminator: Trained interpretation or bilingual speech-language evaluation can clarify the true pattern.

Takeaway: Multilingual assessment must distinguish acquired language loss from limited proficiency in the examiner's language.

Case sources: ^[1]