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Titolo:
Delay analysis in the auditory brainstem of the rat: comparison with clicklatency
Autore:
FitzGerald, JV; Burkitt, AN; Clark, GM; Paolini, AG;
Indirizzi:
Univ Melbourne, Royal Victorian Eye & Ear Hosp, Dept Otolaryngol, Melbourne, Vic 3002, Australia Univ Melbourne Melbourne Vic Australia 3002 elbourne, Vic 3002, Australia Bion Ear Inst, Melbourne, Vic 3002, Australia Bion Ear Inst Melbourne VicAustralia 3002 Melbourne, Vic 3002, Australia
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 159, anno: 2001,
pagine: 85 - 100
SICI:
0378-5955(200109)159:1-2<85:DAITAB>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL SUPERIOR OLIVE; COCHLEAR NERVE; PHASE-LOCKING; HUMAN ADULTS; RESPONSES; STEM; FIBERS; DISCHARGES; FREQUENCY; INTENSITY;
Keywords:
auditory brainstem; click latency; delay analysis; temporal processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Paolini, AG Univ Melbourne, Royal Victorian Eye & Ear Hosp, Dept Otolaryngol, 32 Gisborne St, Melbourne, Vic 3002, Australia Univ Melbourne 32 Gisborne St Melbourne Vic Australia 3002 lia
Citazione:
J.V. FitzGerald et al., "Delay analysis in the auditory brainstem of the rat: comparison with clicklatency", HEARING RES, 159(1-2), 2001, pp. 85-100

Abstract

Many cells in the auditory brainstem 'phase lock' to tone stimuli. From the changing phase relationship between the stimulus and the neural response in phase-locking cells, the delay between them can be estimated. This delay, however, is consistently greater than the latency measured in response toclick stimuli, an important discrepancy. In this paper the different measures of delay, namely phase delay, group delay and signal-front delay are re-examined. An improved method for computing the average group delay is presented, which accounts for the cyclical nature of the phase data. Data were collected from units in successive processing sites of auditory pathway: the auditory nerve, the cochlear nucleus, the trapezoid body and the medial nucleus of the trapezoid body. Low-characteristic frequency (CF) units gave multimodal post-stimulus-time histograms in response to clicks, and showed stepwise decreases in latency with increasing intensity, with the appearance of earlier peaks in the response, rather than shifts in the timing of thepeaks. The separation of peaks corresponded to the inverse of the unit's CF. High-CF units also showed a decline in click latency with intensity, butto a lesser degree than low CF units. We present an analysis which explains the difference between click latency and delay, and which in contrast to previous accounts is experimentally testable. We demonstrate that this new framework accounts for the discrepancy between the two measures of delay, and in addition accounts for the observed stepwise shifts in click latency for low-CF units. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 01/12/20 alle ore 16:46:01