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Titolo:
The function of the medial superior olive in small mammals: temporal receptive fields in auditory analysis
Autore:
Grothe, B; Neuweiler, G;
Indirizzi:
Univ Munich, Inst Zool, D-80333 Munich, Germany Univ Munich Munich Germany D-80333 h, Inst Zool, D-80333 Munich, Germany
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
fascicolo: 5, volume: 186, anno: 2000,
pagine: 413 - 423
SICI:
0340-7594(200005)186:5<413:TFOTMS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREE-TAILED BAT; INFERIOR COLLICULUS; MOUSTACHED BAT; INTERAURAL TIME; BRAIN-STEM; PTERONOTUS-PARNELLII; ECHOLOCATING BAT; MUSTACHE BAT; CAT; COMPLEX;
Keywords:
medial superior olive; interaural time; difference; receptive field; precedence effect; temporal processing;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Neuweiler, G Univ Munich, Inst Zool, Luisenstr 14, D-80333 Munich, GermanyUniv Munich Luisenstr 14 Munich Germany D-80333 ich, Germany
Citazione:
B. Grothe e G. Neuweiler, "The function of the medial superior olive in small mammals: temporal receptive fields in auditory analysis", J COMP PH A, 186(5), 2000, pp. 413-423

Abstract

Traditionally, the medial superior olive, a mammalian auditory brainstem structure, is considered to encode interaural time differences, the main cuefor localizing low-frequency sounds. Detection of binaural excitatory and inhibitory inputs are considered as an underlying mechanism. Most small mammals, however, hear high frequencies well beyond 50 kHz and have small interaural distances. Therefore, they can not use interaural time differences for sound localization and yet possess a medial superior olive. Physiological studies in bats revealed that medial superior olive cells show similar interaural time difference coding as in larger mammals tuned to low-frequencyhearing. Their interaural time difference sensitivity, however, is far toocoarse to serve in sound localization. Thus, interaural time difference sensitivity in medial superior olive of small mammals is an epiphenomenon. Wepropose that the original function of the medial superior olive is a binaural cooperation causing facilitation due to binaural excitation. Lagging inhibitory inputs, however, suppress reverberations and echoes from the acoustic background. Thereby, generation of antagonistically organized temporal fields is the basic and original function of the mammalian medial superior olive. Only later in evolution with the advent of larger mammals did interaural distances, and hence interaural time differences, became large enough to be used as cues for sound localization of low-frequency stimuli.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 16:42:40