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Titolo:
Automatic discriminative sensitivity inside temporal window of sensory memory as a function of time
Autore:
Yabe, H; Koyama, S; Kakigi, R; Gunji, A; Tervaniemi, M; Sato, Y; Kaneko, S;
Indirizzi:
Hirosaki Univ, Sch Med, Dept Neuropsychiat, Hirosaki, Aomori 0368562, Japan Hirosaki Univ Hirosaki Aomori Japan 0368562 rosaki, Aomori 0368562, Japan Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 , Okazaki, Aichi 444, Japan Univ Helsinki, Dept Psychol, Cognit Brain Res Unit, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 it, FIN-00014 Helsinki, Finland
Titolo Testata:
COGNITIVE BRAIN RESEARCH
fascicolo: 1, volume: 12, anno: 2001,
pagine: 39 - 48
SICI:
0926-6410(200108)12:1<39:ADSITW>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; MISMATCH NEGATIVITY; AUDITORY-STIMULI; DURATION; TRACE; INTEGRATION; FEATURES; CORTEX;
Keywords:
auditory event-related potentials; mismatch negativity; magnetoencephalography; sensory memory; temporal window of integration; discriminative sensitivity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Yabe, H Hirosaki Univ, Sch Med, Dept Neuropsychiat, Hirosaki, Aomori 0368562, Japan Hirosaki Univ Hirosaki Aomori Japan 0368562 Aomori 0368562, Japan
Citazione:
H. Yabe et al., "Automatic discriminative sensitivity inside temporal window of sensory memory as a function of time", COGN BRAIN, 12(1), 2001, pp. 39-48

Abstract

Neural representation of preceding sound-patterns stored in the human brain, as reflected by mismatch negativity (MMN) related to the automatic discriminative process, is restricted to a duration of 160-170 ms due to the short form of auditory sensory memory termed the temporal window of integration (TWI). To examine the temporal uniformity of deviation-sensitivity insideTWI of sensory memory, magnetic MMN (MMNm) responses were measured with a dual 37-channel magnetometer for complex sounds of 170 ms duration containing an omitted (silent) segment. Frequent standard stimuli (probability of 80%) consisted of five tone segments. Deviant stimuli were different from standard stimuli in that one of four segments was occasionally (probability of 5%) omitted and replaced by a silent segment. The stimulus duration of 170 ins was intended to correspond to the postulated duration of TWI. When the silent segment occurred later in deviant stimulus, the MMNm peak amplitude was attenuated and MMNm peak latency, measured from the onset of each silent segment, was delayed. Thus, automatic deviation-detection sensitivity declines nonlinearly toward the end of TWI in auditory sensory memory. In the second experiment, two types of deviant stimuli, which differed from eachother only in the period after the occurrence of the silent segment, elicited MMNm with the same peak latency but with a different peak amplitude. Thus, mismatch process is triggered at the moment of change but still lasts after the detection of deviation. In other words, both standard and deviant stimuli are treated as a unitary event within a TWI. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/10/20 alle ore 13:53:42