A stroke patient produces effortful, halting speech using mostly content words ('want...coffee...store...go') but can follow simple verbal instructions and answer yes/no questions accurately. Where is the most likely lesion?
AWernicke's area (posterior superior temporal gyrus)
BBroca's area (posterior inferior frontal gyrus)
CArcuate fasciculus
DPrimary auditory cortex
Effortful, telegraphic speech with omitted grammatical words but relatively preserved comprehension is the hallmark of Broca's aphasia. The patient knows what they want to say but cannot assemble the syntactic frame — a production deficit localized to Broca's area. Wernicke's aphasia would produce fluent but meaningless speech with severely impaired comprehension. The arcuate fasciculus connects the two areas; its damage disrupts repetition while sparing production and comprehension.
Question 2 Multiple Choice
A patient speaks fluently with normal rate and prosody, but uses 'table' when they mean 'chair' and cannot follow verbal instructions. This pattern best describes which condition?
ABroca's aphasia — the frontal lobe damage affects semantic selection
BConduction aphasia — arcuate fasciculus damage disrupts word selection
CWernicke's aphasia — damage to the superior temporal gyrus impairs both comprehension and semantic monitoring
DGlobal aphasia — bilateral damage affecting all language systems
Fluent speech with semantic paraphasias (real words substituted incorrectly) and severely impaired comprehension is the signature of Wernicke's aphasia. Wernicke's area is critical for accessing word meaning and for monitoring whether one's own output matches communicative intent — its damage breaks both. Broca's aphasia would produce non-fluent speech. Conduction aphasia primarily disrupts repetition, not comprehension.
Question 3 True / False
Broca's area primarily contributes to language during speech production; it plays no role in comprehension.
TTrue
FFalse
Answer: False
This is a common oversimplification. Modern neuroimaging shows Broca's area is active during comprehension tasks, and Broca's aphasia impairs comprehension of grammatically complex sentences (passives, center-embedded relative clauses) even when simple sentence comprehension is preserved. This makes sense if Broca's area implements syntactic processing — a process needed both to produce and to parse grammatical structure.
Question 4 True / False
Damage to the arcuate fasciculus produces a dissociation in which speech production and comprehension are relatively spared but repetition is severely impaired.
TTrue
FFalse
Answer: True
This is conduction aphasia, and it is one of the most theoretically important aphasia types. The arcuate fasciculus is the white-matter tract connecting Broca's and Wernicke's areas. When it is severed, production systems (Broca's) and comprehension systems (Wernicke's) remain intact but cannot communicate with each other — the patient understands what is said and can produce spontaneous speech, but cannot route heard speech into the production system for repetition.
Question 5 Short Answer
A patient passes all simple comprehension tests but fails to repeat sentences and makes substitution errors in spontaneous speech. Explain what this pattern reveals about how language is organized in the brain.
Think about your answer, then reveal below.
Model answer: The pattern (preserved comprehension, preserved spontaneous production, impaired repetition) suggests conduction aphasia from arcuate fasciculus damage. This reveals that language is organized as a network of specialized hubs connected by white-matter pathways, not as a single system. Production and comprehension can function independently because they are served by distinct regions; repetition fails specifically because it requires direct information transfer between the comprehension and production subsystems via the arcuate fasciculus.
This question tests whether the student understands the network architecture rather than just memorizing which area does what. The key insight is that the dissociation pattern itself is diagnostic: you can infer where a lesion is by observing which functions are preserved and which are disrupted. The arcuate fasciculus dissociation is particularly telling because it shows that repetition is not simply a combination of comprehension and production — it requires a specific connective pathway.