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Titolo:
Spectre-temporal analysis of complex tones: two cortical processes dependent on retention of sounds in the long auditory store
Autore:
Jones, SJ; Pato, MV; Sprague, L;
Indirizzi:
Natl Hosp Neurol & Neurosurg, Dept Clin Neurophysiol, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg London England WC1N 3BG n WC1N 3BG, England
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 9, volume: 111, anno: 2000,
pagine: 1569 - 1576
SICI:
1388-2457(200009)111:9<1569:SAOCTT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MISMATCH NEGATIVITY; EVOKED-POTENTIALS; FREQUENCY-MODULATION; CORTEX; RESPONSES; INTENSITY; STIMULI; NEURONS; PITCH; WAVE;
Keywords:
auditory evoked potential; mismatch negativity; complex tones; spectro-temporal sound analysis; grouping; stream segregation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Jones, SJ Natl Hosp Neurol & Neurosurg, Dept Clin Neurophysiol, Queen Sq, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg Queen Sq London England WC1N 3BG d
Citazione:
S.J. Jones et al., "Spectre-temporal analysis of complex tones: two cortical processes dependent on retention of sounds in the long auditory store", CLIN NEU, 111(9), 2000, pp. 1569-1576

Abstract

Objectives: To examine whether two cortical processes concerned with spectro-temporal analysis of complex tones, a 'C-process' generating CN1 and CP2potentials at ct 100 and 180 ms after sudden change of pitch or timbre, and an 'M-process' generating MN1 and MP2 potentials of similar latency at the sudden cessation of repeated changes, are dependent on accumulation of a sound image in the long auditory store. Methods: The durations of steady (440 Hz) and rapidly oscillating (440-494Hz, 16 changes/s) pitch of a synthesized 'clarinet' tone were reciprocallyvaried between 0.5 and 4.5 s within a duty cycle of 5 s. Potentials were recorded at the beginning and end of the period of oscillation in 10 non-attending normal subjects. Results: The CN1 at the beginning of pitch oscillation and the MN1 at the end were both strongly influenced by the duration of the immediately preceding stimulus pattern, mean amplitudes being 3-4 times larger after 4.5 s ascompared with 0.5 s,Conclusions: The processes responsible for both CN1 and MN1 are influencedby the duration of the preceding sound pattern over a period comparable tothat of the 'echoic memory' or long auditory store. The store therefore appears to occupy a key position in spectre-temporal sound analysis. The C-process is concerned with the spectral structure of complex sounds, and may therefore reflect the 'grouping' of frequency components underlying auditorystream segregation. The hi-process (mismatch negativity) is concerned withthe: temporal sound structure, and may play an important role in the extraction of information from sequential sounds. (C) 2000 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 18/02/20 alle ore 04:17:54