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Titolo:
Temporal processing from the auditory nerve to the medial nucleus of the trapezoid body in the rat
Autore:
Paolini, AG; FitzGerald, JV; Burkitt, AN; Clark, GM;
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: 101 - 116
SICI:
0378-5955(200109)159:1-2<101:TPFTAN>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTEROVENTRAL COCHLEAR NUCLEUS; BUSHY CELLS; INTRACELLULAR RESPONSES; NEURAL SYNCHRONIZATION; COINCIDENCE DETECTION; AMPLITUDE-MODULATION; PRINCIPAL CELLS; SUPERIOR OLIVE; PHASE-LOCKING; FIRE NEURONS;
Keywords:
auditory nerve; cochlear nucleus; medial nucleus of the trapezoid body; temporal processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
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:
A.G. Paolini et al., "Temporal processing from the auditory nerve to the medial nucleus of the trapezoid body in the rat", HEARING RES, 159(1-2), 2001, pp. 101-116

Abstract

This investigation examines temporal processing through successive sites in the rat auditory pathway: auditory nerve (AN), anteroventral cochlear nucleus (AVCN) and the medial nucleus of the trapezoid body (MNTB). The degreeof phase-locking, measured as vector strength, varied with intensity relative to the cell's threshold, and saturated at a value that depended upon stimulus frequency. A typical pattern showed decline in the saturated vector strength from approximately 0.8 at 400 Hz to about 0.3 at 2000 Hz, with similar profiles in units with a range of characteristic frequencies (480-32000 Hz). A new expression for temporal dispersion indicates that this variation corresponds to a limiting degree of temporal imprecision, which is relatively consistent between different cells. From AN to AVCN, an increase in vector strength was seen for frequencies below 1000 Hz. At higher frequencies, a decrease in vector strength was observed. From AVCN to MNTB a tendencyfor temporal coding to be improved below 800 Hz and degraded further above1500 Hz was seen. This change in temporal processing ability could be attributed to units classified as primary-like with notch (PLN). PLN MNTB unitsshowed a similar vector strength distribution to PLN AVCN units. Our results suggest that AVCN PLN units, representing globular bushy cells, are specialised for enhancing the temporal code at low frequencies and relaying this information to principal cells of the MNTB. (C) 2001 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 15/07/20 alle ore 06:54:38