Verb deficits in Alzheimer's disease and agrammatism: Implications for lexical organization  

Oleh:

Kim, Mikyong ; Thompson, Cynthia K.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 88 no. 1 (2004), page 1-20.
Topik: Verb production in aphasia; Verb production in Alzheimer's Disease; Verb impairment in aphasia; Verb impairment in Alzheimer's Disease; Agrammatism; Language in Alzheimer's Disease; Lexical organization in aphasia; Lexical organization in Alzheimer's Disease
Fulltext: 88_01_Kim.pdf (331.28KB)

Isi artikel

This study examined the nature of verb deficits in 14 individuals with probable Alzheimer's Disease (PrAD) and nine with agrammatic aphasia. Production was tested, controlling both semantic and syntactic features of verbs, using noun and verb naming, sentence completion, and narrative tasks. Noun and verb comprehension and a grammaticality judgment task also were administered. Results showed that while both PrAD and agrammatic subjects showed impaired verb naming, the syntactic features of verbs (i.e., argument structure) influenced agrammatic, but not Alzheimer's disease patients' verb production ability. That is, agrammatic patients showed progressively greater difficulty with verbs associated with more arguments, as has been shown in previous studies (e.g., Kim & Thompson, 2000; Thompson, 2003; Thompson, Lange, Schneider, & Shapiro, 1997), and suggest a syntactic basis for verb production deficits in agrammatism. Conversely, the semantic complexity of verbs affected PrAD, but not agrammatic, patients performance, suggesting ‘‘bottom-up’’ breakdown in their verb lexicon, paralleling that of nouns, resulting from the degradation or loss of semantic features of verbs.

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