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Titolo:
STATISTICAL PROPERTIES OF SPONTANEOUS OTOACOUSTIC EMISSIONS IN ONE BIRD AND 3 LIZARD SPECIES
Autore:
VANDIJK P; MANLEY GA; GALLO L; PAVUSA A; TASCHENBERGER G;
Indirizzi:
UNIV GRONINGEN HOSP,ENT DEPT,POB 30001 NL-9700 RB GRONINGEN NETHERLANDS TECH UNIV MUNICH,INST ZOOL D-85748 GARCHING GERMANY
Titolo Testata:
The Journal of the Acoustical Society of America
fascicolo: 4, volume: 100, anno: 1996,
parte:, 1
pagine: 2220 - 2227
SICI:
0001-4966(1996)100:4<2220:SPOSOE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREQUENCY FLUCTUATIONS; RELAXATION DYNAMICS; ACOUSTIC EMISSIONS; EXTERNAL TONES; AMPLITUDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
P. Vandijk et al., "STATISTICAL PROPERTIES OF SPONTANEOUS OTOACOUSTIC EMISSIONS IN ONE BIRD AND 3 LIZARD SPECIES", The Journal of the Acoustical Society of America, 100(4), 1996, pp. 2220-2227

Abstract

Spontaneous otoacoustic emissions were recorded in the barn owl Tyto alba guttata (five ears), and in three lizard species (Callopistes maculatus, one ear; Varanus exanthematicus, seven ears; Gerrhonotus leiocephalus, one ear). The barn owl ears emitted one or two emission frequencies; the lizard ears had one, two, or three emissions. For each peak in the emission spectrum, an amplitude distribution was obtained. Bycomparing the spectrum and the histogram, it is concluded that the emission signals obeyed partly sinusoidal and partly noise statistics. The latter is presumably caused by random amplitude fluctuations of theemissions. Four out of 7 owl emissions and 7 out of 16 lizard emissions were dominated by sinusoidal statistics. For these emissions, the relative rms amplitude fluctuation ranged from 0.13 to 0.41 for the barn owl, and from 0.04 to 0.29 for the lizards. These emission must havebeen generated by an active oscillator in the ear. In one barn owl ear, mutual suppression of two neighboring emissions was observed. This caused one of the two emissions to deviate substantially from sinusoidal statistics. The II remaining emissions were dominated by noise statistics, presumably due to large amplitude fluctuations. For these emissions, our data are not conclusive on whether an active oscillator is involved in the emission generation. (C) 1996 Acoustical Society of America.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:43:46