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Semantic, lexical and phonological influences



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Brain and Language 89 2004 484 498 www elsevier com locate b l Semantic lexical and phonological in uences on the production of verb in ections in agrammatic aphasia Yasmeen Faroqi Shah and Cynthia K Thompson Department of Communication Sciences and Disorders Northwestern University 2240 Campus Drive Evanston IL 60208 USA Accepted 23 December 2003 Abstract Verb in ection errors often seen in agrammatic aphasic speech have been attributed to either impaired encoding of diacritical features that specify tense and aspect or to impaired a xation during phonological encoding In this study we examined the e ect of semantic markedness word form frequency and a x frequency as well as accuracy and error patterns in an attempt to evaluate whether diacritical or a xation operations are impaired Verb in ections V ing V ed V s and V stem in present progressive past present 3rd person singular and future tense contexts respectively were elicited in eight mild moderate agrammatic aphasic individuals in a sentence context using a picture description task Results revealed that the majority of verbs produced were a xed 75 although accuracy was low 36 Word form frequency was found to be a signi cant predictor of the accuracy with which verb in ections were produced while a x frequency and semantic markedness were not found to in uence accuracy These results suggest that a diacritical de cit is more likely to undermine the production of verb in ections than a a xation de cit and indicate that when diacritical processes are compromised word form frequency is likely to in uence production of verb in ections in agrammatic aphasia 2004 Elsevier Inc All rights reserved Keywords Agrammatism Aphasia In ection Verb production Frequency 1 Introduction An impairment in the production of in ectional morphology is one of the characteristic features of agrammatic Broca s aphasia and this has been the focus of much research in the past two decades In English speaking individuals with agrammatic



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