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Titolo:
Impaired categorical perception of synthetic speech sounds in schizophrenia
Autore:
Cienfuegos, A; March, L; Shelley, AM; Javitt, DC;
Indirizzi:
NathanOrangeburg,st Psychiat Res, Program Cognit Neurosci & Schizophrenia,Nathan S Kline Inst Psychiat Res Orangeburg NY USA 10962 & Schizophrenia, Bronx Psychiat Ctr, Schizophrenia Res Unit, Bronx, NY 10461 USA Bronx Psychiat Ctr Bronx NY USA 10461 renia Res Unit, Bronx, NY 10461 USA
Titolo Testata:
BIOLOGICAL PSYCHIATRY
fascicolo: 1, volume: 45, anno: 1999,
pagine: 82 - 88
SICI:
0006-3223(19990101)45:1<82:ICPOSS>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR TEMPORAL GYRUS; MISMATCH NEGATIVITY; LANGUAGE; DISCRIMINATION; ORGANIZATION; CHILDREN; MEMORY; DYSFUNCTION; RESPONSES; DEFICITS;
Keywords:
auditory; echoic; memory; cognition; perception; language;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Javitt, DC Nathan140Kline Inst Psychiat Res, Program Cognit Neurosci & Schizophrenia, Nathan S Kline Inst Psychiat Res 140 Old Orangeburg Rd Orangeburg NY USA 10962
Citazione:
A. Cienfuegos et al., "Impaired categorical perception of synthetic speech sounds in schizophrenia", BIOL PSYCHI, 45(1), 1999, pp. 82-88

Abstract

Background: Simple speech sounds such as /ba/ and /da/ differ in the frequency composition of their underlying formants. Normal volunteers asked to identify intermediate phonemes along the /ba/ to /da/ continuum abruptly switch from perceiving "ba" to perceiving "da". The present study investigatesprecision of phonemic processing in schizophrenia. Methods: Categorical perception of speech sounds was evaluated in 15 schizophrenic and 14 control subjects, using a forced-choice phonemic discrimination paradigm. Results: Patients and controls were equally able to recognize endpoint forms of both phonemes, but differed significantly in their perception of intermediate forms near the center of the continuum. Patients also showed a significantly shallower response curve, suggesting an impairment in boundary definition. Despite their impairment in categorical perception, schizophrenic subjects showed normal adaptation of response when test stimuli were preceded by a series of /ba/ or /da/ stimuli from the endpoints of the continuum. Conclusions: The present results suggest that precision of phonemic processing is impaired in schizophrenia. This categorical perception deficit may represent upward generalization of impaired memory-dependent acoustic processing. Deficits in the precision of cortical processing may contribute significantly to cognitive dysfunction in schizophrenia. Biol Psychiatry 1999;45:82-88 (C) 1999 Society of Biological Psychiatry.

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Documento generato il 18/01/20 alle ore 22:18:31