American Journal of Speech-Language Pathology Vol.21 S179-S189 May 2012. doi:10.1044/1058-0360(2012/11-0109)
© American Speech-Language-Hearing Association
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Select Papers From the 41st Clinical Aphasiology Conference

The Time-Course of Lexical Activation During Sentence Comprehension in People With Aphasia

Michelle Ferrilla,,b
Tracy Lovea,,b
Matthew Walenskia,,b
Lewis P. Shapiroa
a San Diego State University, CA
b University of California, San Diego

Correspondence to Tracy Love: tlove{at}mail.sdsu.edu

Purpose: To investigate the time-course of processing of lexical items in auditorily presented canonical (subject–verb–object) constructions in young, neurologically unimpaired control participants and participants with left-hemisphere damage and agrammatic aphasia.

Method: A cross modal picture priming (CMPP) paradigm was used to test 114 control participants and 8 participants with agrammatic aphasia for priming of a lexical item (direct object noun) immediately after it is initially encountered in the ongoing auditory stream and at 3 additional time points at 400-ms intervals.

Results: The control participants demonstrated immediate activation of the lexical item, followed by a rapid loss (decay). The participants with aphasia demonstrated delayed activation of the lexical item.

Conclusion: This evidence supports the hypothesis of a delay in lexical activation in people with agrammatic aphasia. The delay in lexical activation feeds syntactic processing too slowly, contributing to comprehension deficits in people with agrammatic aphasia.

Key Words: aphasia, syntax, slow rise-time, rate of speech, online, priming, sentence processing, neurolinguistics


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