ERIC Number: EJ1072394
Record Type: Journal
Publication Date: 2015-Aug
Abstractor: As Provided
Grammatical Planning Units during Real-Time Sentence Production in Speakers with Agrammatic Aphasia and Healthy Speakers
Lee, Jiyeon; Yoshida, Masaya; Thompson, Cynthia K.
Journal of Speech, Language, and Hearing Research, v58 n4 p1182-1194 Aug 2015
Purpose: Grammatical encoding (GE) is impaired in agrammatic aphasia; however, the nature of such deficits remains unclear. We examined grammatical planning units during real-time sentence production in speakers with agrammatic aphasia and control speakers, testing two competing models of GE. We queried whether speakers with agrammatic aphasia produce sentences word by word without advanced planning or whether hierarchical syntactic structure (i.e., verb argument structure; VAS) is encoded as part of the advanced planning unit. Method: Experiment 1 examined production of sentences with a predefined structure (i.e., "The A and the B are above the C") using eye tracking. Experiment 2 tested production of transitive and unaccusative sentences without a predefined sentence structure in a verb-priming study. Results: In Experiment 1, both speakers with agrammatic aphasia and young and age-matched control speakers used word-by-word strategies, selecting the first lemma (noun A) only prior to speech onset. However, in Experiment 2, unlike controls, speakers with agrammatic aphasia preplanned transitive and unaccusative sentences, encoding VAS before speech onset. Conclusions: Speakers with agrammatic aphasia show incremental, word-by-word production for structurally simple sentences, requiring retrieval of multiple noun lemmas. However, when sentences involve functional (thematic to grammatical) structure building, advanced planning strategies (i.e., VAS encoding) are used. This early use of hierarchical syntactic information may provide a scaffold for impaired GE in agrammatism.
Descriptors: Grammar, Aphasia, Language Impairments, Control Groups, Verbs, Syntax, Language Processing, Eye Movements, Nouns, Task Analysis, Speech
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) (NIH); National Science Foundation (NSF)
Authoring Institution: N/A
Grant or Contract Numbers: R01-DC01948; BCS-1323245