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Titolo:
Cortical processing of complex tone stimuli: mismatch negativity at the end of a period of rapid pitch modulation
Autore:
Pato, MV; Jones, SJ;
Indirizzi:
Natlandsp Neurol & Neurosurg, Dept Clin Neurophysiol, London WC1N 3BG, Engl Natl Hosp Neurol & Neurosurg London England WC1N 3BG ndon WC1N 3BG, Engl
Titolo Testata:
COGNITIVE BRAIN RESEARCH
fascicolo: 3, volume: 7, anno: 1999,
pagine: 295 - 306
SICI:
0926-6410(199901)7:3<295:CPOCTS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY AUDITORY-CORTEX; EVENT-RELATED POTENTIALS; FREQUENCY-MODULATION; EVOKED-RESPONSE; SOUNDS; BRAIN; REPRESENTATION; COMPONENT; INTENSITY; NEURONS;
Keywords:
audition; auditory evoked potential; auditory cortex; complex tone; echoic memory; mismatch negativity; music perception;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Jones, SJ Natl Hosp Neurol & Neurosurg, Dept Clin Neurophysiol, Queen Sq, London WC1N Natl Hosp Neurol & Neurosurg Queen Sq London England WC1N 3BG N
Citazione:
M.V. Pato e S.J. Jones, "Cortical processing of complex tone stimuli: mismatch negativity at the end of a period of rapid pitch modulation", COGN BRAIN, 7(3), 1999, pp. 295-306

Abstract

In this study, synthesised instrumental tones were used to examine human auditory cortical processes engaged at the end of a period of rapid pitch modulation. It was previously [S.J. Jones, O. Longe, M. Vat Pato, Auditory evoked potentials to abrupt pitch and timbre change of complex tones: electrophysiological evidence of 'streaming'?, Electroencephalogr. Clin. Neurophysiol., 108 (1998) 131-142] suggested that the 'change-N1' produced by infrequent changes in pitch or timbre of a continuous complex tone represents theactivity of a neuronal population topographically distinct from that responsible for the 'onset-N1' at the beginning of the tone. In the present study a superficially similar negativity was produced when the tone came to rest on a steady pitch after a period of rapid (8-16 changes/s) modulation; its scalp maximum was anterior to that of the two previously identified potentials but similar to that of the mismatch negativity elicited by discontinuous tones. By varying the modulation rate the latency was shown to be relatively constant with respect to the time the next pitch change was expected but failed to occur. The largest responses averaging c. 7 mu V were evoked at the end of modulation sequences which were both rhythmic and repetitive,but a potential was still produced when there was no rhythmic pattern or repetition of individual notes. This response to non-occurrence of an expected but not necessarily specified change implies an automatic process for comparing the incoming sound with an extrapolated template of the preceding pattern in which timing as well as pitch information is accurately represented. We suggest this technique offers a robust method for eliciting the mismatch negativity, which may extend the opportunities for electrophysiological investigation of higher auditory processes. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 21:46:32