The production of grammatical morphology in Broca's and Wernicke's aphasics: speed and accuracy factors.
A group of Broca's aphasics (BA), Wernicke's aphasics (WA) and normal controls participated in a CLOZE experiment which required the oral production of various types of free and bound morphemes. Results provided support for the hypothesis that BA and WA share the same underlying impairment in the production of grammatical morphology. The relative difficulty of the various free and bound morpheme types was the same for BA and WA. This appeared to be the case not only in an analysis of the number of errors but also in an analysis of response times. The same analyses furthermore revealed no significant differences in the absolute levels of performance of BA and WA. Finally, it was found that BA and WA show the same relative contribution of within- and across-category substitutions of free morphemes. For bound morphemes, there was a slight difference between BA and WA, in that BA exclusively produced within-category substitutions while WA also produced some across-category substitutions.
Haarmann
H J
HJ
Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands.
Kolk
H H
HH
D000328:Adult; D000368:Aged; D001039:Aphasia, Broca / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D001041:Aphasia, Wernicke / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D001288:Attention / Q000502:physiology; D001925:Brain Damage, Chronic / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D002540:Cerebral Cortex / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D011939:Mental Recall / Q000502:physiology; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D010700:Phonetics; D011594:Psychometrics; D011930:Reaction Time / Q000502:physiology; D012660:Semantics; D014705:Verbal Behavior / Q000502:physiology