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Grammar in 'agrammatical' aphasia: What's intact?
Han Zhang1, Wolfram Hinzen1,2
1Department of Translation and Language Sciences, Universitat Pompeu Fabra, Barcelona, Spain.
Plos One
|December 6, 2022
Summary
Individuals with Broca's aphasia (BA) retain grammatical knowledge despite language impairments. Their speech patterns suggest intact syntactic structures, challenging BA as a pure language disorder model.
Area of Science:
- Neuroscience
- Linguistics
- Psychology
Background:
- Aphasia after cerebro-vascular accidents offers insights into brain language models.
- Deviant language in aphasia may stem from processing and cognitive deficits, not solely language impairment.
Purpose of the Study:
- Investigate grammatical knowledge intactness in Broca's aphasia (BA).
- Examine the preservation of hierarchical syntactic structures in spontaneous speech of individuals with BA.
Main Methods:
- Analyzed spontaneous speech from 20 individuals with BA and 20 controls using the AphasiaBank protocol.
- Quantified Aspect, Tense, Modality (A-T-M) marking, clausal unit hierarchies, discourse markers, and adjunct attachment.
- Examined error typology and pause subcategorization based on syntactic position.
Main Results:
- Individuals with BA underproduced Tense and embedded clauses, showing compensatory effects.
- While adjuncts were underproduced and pauses overproduced in BA, their relative proportions remained consistent.
- Errors were primarily omissions, similar to condensed neurotypical speech.
Conclusions:
- Speech patterns in agrammatic BA support intact grammatical knowledge.
- Findings question the utility of Broca's aphasia as a disease model for language impairment.
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