Time course of grammatical encoding in agrammatism

Lee, Jiyeon and Yoshida, Masaya and Thompson, Cynthia K. (2011) Time course of grammatical encoding in agrammatism. [Clinical Aphasiology Paper]

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Abstract

Two on-line sentence production experiments explored the time course of grammatical encoding in normal and agrammatic speakers. Incremental models suggest grammatical encoding proceeds in a word-by-word manner, without advanced planning. Structural models suggest a hierarchical predicate structure (e.g., verb argument structure, VAS) is encoded prior to speech onset. Results showed that when agrammatic speakers produced sentences in a pre-defined order, they produced sentences incrementally, similar to controls. However, in a free sentence production task, both controls and agrammatic speakers encoded VAS prior to speech onset. Further, agrammatic speakers’ syntactic deficits resulted in a greater use of VAS than controls.

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