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Titolo:
Sound duration selectivity in the pallid bat inferior colliculus
Autore:
Fuzessery, ZM; Hall, JC;
Indirizzi:
Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82001 USA Univ Wyoming Laramie WY USA 82001 t Zool & Physiol, Laramie, WY 82001 USA Univ Tennessee, Dept Biochem Cell & Mol Biol, Knoxville, TN 37996 USA UnivTennessee Knoxville TN USA 37996 & Mol Biol, Knoxville, TN 37996 USA
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 137, anno: 1999,
pagine: 137 - 154
SICI:
0378-5955(199911)137:1-2<137:SDSITP>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL SUPERIOR OLIVE; BIG BROWN BAT; AUDITORY-CORTEX; REPETITION RATE; TONOTOPIC ORGANIZATION; ANTROZOUS-PALLIDUS; LATERAL LEMNISCUS; EPTESICUS-FUSCUS; MYOTIS-LUCIFUGUS; MOUSTACHED BAT;
Keywords:
inferior colliculus; duration selectivity; pallid bat; gamma-aminobutyric acid; bicuculline; synaptic integration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Fuzessery, ZM Univ Wyoming, Dept Zool & Physiol, POB 3166, Laramie, WY 82001 USA Univ Wyoming POB 3166 Laramie WY USA 82001 mie, WY 82001 USA
Citazione:
Z.M. Fuzessery e J.C. Hall, "Sound duration selectivity in the pallid bat inferior colliculus", HEARING RES, 137(1-2), 1999, pp. 137-154

Abstract

Neurons selective for sound duration have been reported in the auditory midbrain and cortex of several specialized vertebrate species that process behaviorally relevant signals of stereotypic duration. This study examines duration selectivity in the inferior colliculus (IC) of the pallid bat to determine if this selectivity is limited to regions that serve echolocation, or if it extends to low-frequency regions that serve passive listening. It also focuses on the temporal response properties of duration-selective neurons to elucidate mechanisms that may underlie the creation of this selectivity. Of 140 neurons tested, 36% were selective for short durations of less than or equal to 7 ms, and acted as short-pass or bandpass duration filters. Sixteen percent, termed long duration neurons, differed in that they required minimum sound durations of 5-50 ms before responding, and all acted as long-pass duration filters. Short duration neurons were equally common in the high-frequency region serving echolocation and the lateral low-frequencyregion that serves passive listening, indicating that selectivity for short duration sounds was not associated only with the specialized function of echolocation. Long duration neurons were most common in the medial low-frequency region IC. Selectivity for short and long duration sounds was therefore not uniformly distributed across the IC. Analyses of the temporal response properties of short duration neurons, and the application of bicucullineto block gamma-aminobutyric acid-A receptors, were used to infer the synaptic interactions that underlie the creation of duration selectivity, the role of inhibition in its creation, and whether a coincidence mechanism proposed by Casseday et al. (Science 264 (1994) 847-850) is consistent with the behavior of the duration-selective neurons recorded in the pallid bat IC. Present results suggest that while some neurons do behave in a manner that is consistent with the coincidence mechanism, the behaviors of others suggest that more than one mechanism may create a selectivity for short duration sounds. (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 01/12/20 alle ore 16:42:10