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Titolo:
Effects of acute pure tone induced hearing loss on response properties in three auditory cortical fields in cat
Autore:
Kimura, M; Eggermont, JJ;
Indirizzi:
Univ Calgary, Dept Psychol, Calgary, AB T2N 1N4, Canada Univ Calgary Calgary AB Canada T2N 1N4 ychol, Calgary, AB T2N 1N4, Canada Univ Calgary, Dept Physiol & Biophys, Calgary, AB T2N 1N4, Canada Univ Calgary Calgary AB Canada T2N 1N4 ophys, Calgary, AB T2N 1N4, Canada
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 135, anno: 1999,
pagine: 146 - 162
SICI:
0378-5955(199909)135:1-2<146:EOAPTI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFERIOR COLLICULUS; ELECTRICAL-STIMULATION; LATERAL INHIBITION; NEURAL ACTIVITY; CORTEX NEURONS; SALICYLATE; SOUND; PLASTICITY; TINNITUS; POTENTIALS;
Keywords:
noise trauma; cat; auditory cortex; single unit; local field potential frequency tuning; spontaneous activity; tinnitus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Eggermont, JJ Univ Calgary, Dept Psychol, 2500 Univ Dr NW, Calgary, AB T2N1N4, Canada Univ Calgary 2500 Univ Dr NW Calgary AB Canada T2N 1N4 anada
Citazione:
M. Kimura e J.J. Eggermont, "Effects of acute pure tone induced hearing loss on response properties in three auditory cortical fields in cat", HEARING RES, 135(1-2), 1999, pp. 146-162

Abstract

In this study, we assessed the changes in spontaneous activity;and frequency tuning by simultaneous recording of multi-units and local field potentials in primary auditory cortex (AI), anterior auditory field (AAF) and secondary auditory cortex (AII) of cats before and immediately after 30 min exposure to a loud (93-123 dB SPL) pure tone. The average difference of the pure tone and the characteristic frequency (CF) was less than one octave for 70% of the recordings. We found that the mean threshold at CF increased significantly in AI and in AAF but not in AII. The mean CF for units in AI decreased significantly, whereas no significant effect uas noted in AAF and AII. The mean frequency-tuning curve bandwidth decreased significantly in AII. Spontaneous activity increased significantly in AI, did not change in AAF,and decreased significantly in AII. Inter-area neural synchrony was not affected. Multiunit response areas were usually similarly affected as local field potentials based response areas because the 'damaged area', defined asthe response surface before minus the surface after the trauma, was very similar. This suggests that the damage reflects peripheral activity changes. Enhancement of frequency response areas around CF, but at least one octavebelow the frequency of the traumatizing tone, was found most frequently inAAF and suggests a reduction of inhibition likely as a result of the peripheral hearing loss. (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 21/01/20 alle ore 06:57:45