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Titolo:
Impaired speech perception in aphasic patients: event-related potential and neuropsychological assessment
Autore:
Csepe, V; Osman-Sagi, J; Molnar, M; Gosy, M;
Indirizzi:
Hungarian Acad Sci, Inst Psychol, Dept Psychophysiol, H-1394 Budapest, Hungary Hungarian Acad Sci Budapest Hungary H-1394 iol, H-1394 Budapest, Hungary Hungarian Acad Sci, Inst Linguist, Budapest, Hungary Hungarian Acad Sci Budapest Hungary i, Inst Linguist, Budapest, Hungary
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 11, volume: 39, anno: 2001,
pagine: 1194 - 1208
SICI:
0028-3932(2001)39:11<1194:ISPIAP>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY COMPREHENSION; DISCRIMINATION;
Keywords:
impaired speech; aphasic patients; neuropsychological;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Csepe, V Hungarian Acad Sci, Inst Psychol, Dept Psychophysiol, Szondi Utca83-85,POB 398, H-1394 Budapest, Hungary Hungarian Acad Sci Szondi Utca 83-85,POB 398 Budapest Hungary H-1394
Citazione:
V. Csepe et al., "Impaired speech perception in aphasic patients: event-related potential and neuropsychological assessment", NEUROPSYCHO, 39(11), 2001, pp. 1194-1208

Abstract

The mismatch negativity component (MMN) of auditory event-related potentials (ERP) was recorded in four aphasic patients and in age, gender and education matched controls. The MMN changes elicited by tone, vowel, voicing stop consonant and place-of articulation contrasts were recorded over both hemispheres. The results of MMN amplitude, latency and distribution differences between aphasics, and controls were analyzed in detail. An extensive neuropsychological investigation was performed in order highlight the assumed dissociation and possible interactions between the impaired acoustic/phonetic perception and deficient comprehension in aphasic patients. Our principalfinding was that MMN elicited by pitch deviations is not enough sensitive to distinguish between patients and age-matched controls. The MMN elicited by consonant contrasts was found to be the most vulnerable in aphasic patients investigated. The MMN elicited by voicing ([ba:] vs. [pa:]) and place-of-articulation ([ba:] vs. [ga:]) could be characterized by total lack, distorted or very limited distribution and correlated with the patients' performance shown in the behavioral phoneme discrimination task. The magnitude ofthe deficient phoneme (vowel and consonant contrasts) processing shown by MMN anomalies was proportionally related to the non-word. discrimination and did not interact with the word discrimination performance. The impact of deficient speech sound processing on higher level processes may depend on the type of aphasia, while the presence of perceptual deficits in processingacoustic/phonetic contrasts seems to be independent of the type of aphasia. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 30/11/20 alle ore 19:51:46