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Titolo:
Impairment of an event-related potential correlate of memory in schizophrenia: effects of immediate and delayed word repetition
Autore:
Matsumoto, K; Matsuoka, H; Yamazaki, H; Sakai, H; Kato, T; Miura, N; Nakamura, M; Osakabe, K; Saito, H; Ueno, T; Sato, M;
Indirizzi:
Tohoku Univ, Sch Med, Dept Psychiat, Sendai, Miyagi 9808574, Japan Tohoku Univ Sendai Miyagi Japan 9808574 at, Sendai, Miyagi 9808574, Japan Tohoku Univ, Fac Educ, Sendai, Miyagi 9808574, Japan Tohoku Univ Sendai Miyagi Japan 9808574 uc, Sendai, Miyagi 9808574, Japan
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 4, volume: 112, anno: 2001,
pagine: 662 - 673
SICI:
1388-2457(200104)112:4<662:IOAEPC>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NONWORD-REPETITION; BRAIN POTENTIALS; EXPLICIT MEMORY; INTERITEM LAG; ERP; RECOGNITION; MODULATION; IMPLICIT; TASKS; MANIFESTATIONS;
Keywords:
schizophrenia; repetition effect; memory; N400; late positive component; visual event-related potential;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Matsumoto, K Tohoku Univ, Sch Med, Dept Psychiat, Sendai, Miyagi 9808574, Japan Tohoku Univ Sendai Miyagi Japan 9808574 iyagi 9808574, Japan
Citazione:
K. Matsumoto et al., "Impairment of an event-related potential correlate of memory in schizophrenia: effects of immediate and delayed word repetition", CLIN NEU, 112(4), 2001, pp. 662-673

Abstract

Objective: We investigated the nature of the memory impairment in schizophrenia using an event-related potential (ERP). Methods: Visual ERPs were recorded while 20 schizophrenics and 20 controlsperformed semantic categorization tasks with incidental word repetitions. Participants responded to occasional target words. Half of the non-target words were repeated immediately after initial presentation (lag 0) or after 5 intervening words (lag 5). Results: In both groups. ERPs to words at lag 0 were more positive than those to non-repeated words, though this positive-going effect was attenuatedin the schizophrenics, especially around 400-500 ms. The effect at lag 5 was smaller and shorter than that at lag 0 but was comparable between groups. Attenuation of the N400 peak occurred for word repetition at lag 0 in controls but not in schizophrenics, whereas a peak increment in the late positive component induced by word repetition at both lags was observed in both groups. Conclusions: Findings indicate that patients with schizophrenia have a deficit in a brain process modulating ERP correlates of memory, when words arerepeated immediately. This deficit might be related to an abnormal N400 priming effect in schizophrenia. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 21:45:45