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

Ferrill, Michelle and Love, Tracy and Walenski, Matthew and Shapiro, Lewis P
The Time-Course of Lexical Activation During Sentence Comprehension in People With Aphasia. American Journal of Speech-Language Pathology, 21(Suppl.), May, 2012, pages S179-S189.

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Abstract

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.

EPrint Type:Journal (Paginated)
Keywords:aphasia, syntax, slow rise-time, rate of speech, online, priming, sentence processing, neurolinguistics
Subjects:UNSPECIFIED
ID Code:2432
Conference:Clinical Aphasiology Conference: Clinical Aphasiology Conference (2011 : 41st : Fort Lauderdale, FL : May 31-June 4, 2011)
Publication:American Journal of Speech-Language Pathology
Volume:21
Number:Suppl.
Pages:S179-S189
Alternative Locations:http://dx.doi.org/10.1044/1058-0360(2012/11-0109)
DOI or Unique Handle:10.1044/1058-0360(2012/11-0109)
Additional Information:This article is based on a paper originally presented at the CAC2011 Conference. Permission to view the full-text articles is subject to the publisher’s access restrictions.

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