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Titolo:
Scalp potentials to pitch change in rapid tone sequences - A correlate of sequential stream segregation
Autore:
Hung, J; Jones, SJ; Pato, MV;
Indirizzi:
Natl Hosp Neurol & Neurosurg, Dept Clin Neurophysiol, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg London England WC1N 3BG n WC1N 3BG, England Chang Gung Mem Hosp, Dept Neurol, Taipei 10591, Taiwan Chang Gung Mem Hosp Taipei Taiwan 10591 ept Neurol, Taipei 10591, Taiwan
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 140, anno: 2001,
pagine: 56 - 65
SICI:
0014-4819(200109)140:1<56:SPTPCI>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVENT-RELATED POTENTIALS; MISMATCH NEGATIVITY SYSTEM; HUMAN-BRAIN; COMPLEX TONES; SOUND; MEMORY; TIMBRE; REVEAL;
Keywords:
auditory evoked potential; auditory cortex; mismatch negativity; sequential stream segregation; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
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:
J. Hung et al., "Scalp potentials to pitch change in rapid tone sequences - A correlate of sequential stream segregation", EXP BRAIN R, 140(1), 2001, pp. 56-65

Abstract

The object of the study was to look for a neurophysiological substrate of sequential auditory stream segregation. When a sequence of tones alternatesrapidly between pitches separated by more than a few semitones, there is atendency for it to be perceived as two independent "streams". We examined the scalp potentials evoked when the pitch interval abruptly changes, to see whether there are response parameters which might be correlated with sudden stream segregation and/or integration. For 3 s a continuous synthesized tone of "clarinet" timbre oscillated between pitches of F4 and F#4 (one semitone higher) at 16 notes/s, perceived as an integrated stream. The upper note was then raised to E5 (11 semitones above F4, perceived as segregated streams) for a further 3 s and the cycle was repeated 40 times. In a second condition also starting with oscillation between F4 and F#4, the upper notewas lowered to E4 (one semitone below F4, still perceived as a single stream). Further conditions examined the changes between oscillations of 1 and 11 semitones down from E5, 1 and 23 semitones up from F4, and 10 and 11 semitones up from F4. Virtually no potentials were detectable during the periods of unchanging oscillation, but an N1/P2 complex was evoked on each change in the pitch interval. The N1 was termed "MN1" on account of its arguablerelatedness to the mismatch negativity, recorded in a separate experiment using discontinuous tones at a much slower rate. The mean peak latency of the MN1 varied between 96 and 123 ms, the shortest latencies being recorded,not to the largest changes of pitch interval but to the widest pitch intervals between the new tone and the immediately preceding one. Therefore, although a causal relationship with streaming cannot necessarily be inferred, the MN1 latency appears to mark the degree of pitch contrast between consecutive tones, in correlation with the streaming effect.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 07:31:25