PSY 402 Topic 7 DQ 1: Two Forms of Aphasia
The mental lexicon clause is what makes this a cognitive psychology question rather than a clinical one. Access, storage and selection are the terms it wants.
Editorial process
Last reviewed · August 16, 2026
Two forms, two lesion sites, one mental lexicon question
Choose two forms that contrast on something real. Broca's and Wernicke's aphasia is the obvious pair and works well, but conduction aphasia against either of them is more interesting because it isolates the connection rather than either endpoint. Get the anatomy right and be precise about it: Broca's area sits in the inferior frontal gyrus of the dominant hemisphere, Wernicke's area in the posterior superior temporal gyrus, and conduction aphasia is classically attributed to damage to the arcuate fasciculus connecting them. Then describe the clinical picture in a way that follows from the site. Broca's aphasia gives effortful, agrammatic output with comprehension relatively spared and, importantly, awareness of the deficit. Wernicke's gives fluent but empty speech with impaired comprehension and characteristically poor awareness, which is why the two feel so different to talk to. Comprehension is the axis to watch, since it is the feature that separates the fluent from the non-fluent syndromes more reliably than output does.
The mental lexicon clause is the part that makes this a cognitive psychology assignment, and it is the part most posts skip. The mental lexicon is the store of words together with their sound, meaning and grammatical information, plus the processes that access it. Framed that way the two aphasias make a clean double argument. In Broca's aphasia the lexicon appears largely intact but output access is impaired, and content words survive while function words and inflections fail, which suggests grammatical elements are handled separately from content. In Wernicke's aphasia the entries themselves are poorly specified or poorly selected, producing fluent speech in which semantically related wrong words are substituted. So one is an access problem and the other is a representation problem, and saying that explicitly is what answers the question. That framing also tells you what to predict in a naming test, which is a concrete way to close the post rather than restating the contrast.
Likely learning objectives
Inferred from the brief — check these against your own rubric.
- 01Locate two aphasia syndromes anatomically with correct terminology.
- 02Derive the clinical picture from the lesion site.
- 03Define the mental lexicon as a cognitive construct.
- 04Distinguish impaired access from impaired representation.
Read the full question
Review every instruction before using the planning guidance that follows.
Turn the brief into deliverables
- 01Two named aphasia forms chosen for contrast.
- 02The specific brain region affected in each, named anatomically.
- 03Clinical features that follow from those sites, including awareness of deficit.
- 04A definition of the mental lexicon.
- 05An explicit access-versus-representation contrast.
Each aphasia, its site, then what happens to the lexicon
The two forms and why this pair
Name both and justify the contrast they create.
Anatomy of each
Locate each syndrome precisely in the dominant hemisphere.
Clinical picture from the site
Derive fluency, comprehension and awareness from the lesion.
What the mental lexicon is
Define the lexicon as representation plus access processes.
Access versus representation
Show that the two aphasias damage different parts of the lexical system.
Anatomy and clinical description from separate sources
Recommended databases
- NCBI Bookshelf
- PubMed Central
- PsycINFO
- Your course textbook's language chapter
Search sequence
- 1.Take the anatomy from a neuroanatomy reference rather than a psychology summary.
- 2.Take the clinical description from a clinical source, so the two are independently sourced.
- 3.Search for lexical access studies in aphasia to support the final section.
- 4.Check whether your textbook uses a different lexicon model before committing to one.
Reference shortlist
These are authoritative starting points, not a ready-made bibliography. A qualified reviewer must confirm that each source fits the assignment and supports the claim beside which it is cited.
Nothing here is cleared for citation until you have read it.
- 01
Aphasia
StatPearls, NCBI Bookshelf · 2023
The syndrome classification, so the two forms you compare are correctly named.
- 02
Wernicke Aphasia
StatPearls, NCBI Bookshelf · 2023
Fluent aphasia in detail, including the impaired awareness that distinguishes it.
- 03
Neuroanatomy, Broca Area
StatPearls, NCBI Bookshelf · 2023
The anatomy of the anterior language region, for the site half of the question.
- 04
Neuroanatomy, Wernicke Area
StatPearls, NCBI Bookshelf · 2023
The posterior language region, and its connections to the rest of the network.
- 05
Primary Progressive Aphasia
StatPearls, NCBI Bookshelf · 2023
A degenerative comparison in which lexical representation degrades gradually — useful evidence for the representation argument.
Review before submission
Common mistakes
- Saying 'the left frontal lobe' rather than naming the gyrus.
- Describing symptoms with no link back to the lesion site.
- Skipping the mental lexicon clause and writing a clinical comparison.
- Treating both aphasias as degrees of the same deficit.
Submission checklist
- Have you named the specific region, not just the lobe, for each form?
- Does each clinical feature follow from the anatomy you gave?
- Have you defined the mental lexicon before using it?
- Is the access-versus-representation distinction stated explicitly?
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