Semantic weight and verb retrieval in aphasia  

Oleh:

Barde, Laura H.F. ; SCHWARTZ, MYRNA F. ; Boronat, Consuelo B.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 97 no. 3 (2006), page 266-278.
Topik: Aphasia; Agrammatism; Semantic weight; Verb weight; Verb complexity; Verb production; Light verbs; Syntax
Fulltext: 97_03_Barde.pdf (452.96KB)

Isi artikel

Individuals with agrammatic aphasia may have diYculty with verb production in comparison to nouns. Additionally, they may have greater diYculty producing verbs that have fewer semantic components (i.e., are semantically “light”) compared to verbs that have greater semantic weight. A connectionist verb-production model proposed by Gordon and Dell (2003) learns through error correction to “divide the labor” between syntax and semantics. Verbs that are semantically heavier come to depend less on syntax and more on semantics. For lighter verbs, the reverse is true. We performed this study to clarify the role of semantic weight in aphasic verb production and to test the prediction from Gordon and Dell that a brain lesion that impairs the syntactic input to verb retrieval will impair lighter verbs more than heavier ones. Consistent with this prediction, we found that the decrement for lighter verbs was present in a group with agrammatic aphasia but not in a matched group without agrammatism.

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