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Titolo:
DETECTION OF FREQUENCY-MODULATION IN THE FM-BAT PHYLLOSTOMUS DISCOLOR
Autore:
ESSER KH; KIEFER R;
Indirizzi:
UNIV ULM,ABT VERGLEICHENDE NEUROBIOL,ALBERT EINSTEIN ALLEE 11 D-89069ULM GERMANY
Titolo Testata:
Journal of comparative physiology. A, Sensory, neural, and behavioral physiology
fascicolo: 6, volume: 178, anno: 1996,
pagine: 787 - 796
SICI:
0340-7594(1996)178:6<787:DOFITF>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
GREATER HORSESHOE-BAT; DISCRIMINATION; THRESHOLDS;
Keywords:
FREQUENCY DISCRIMINATION; HEARING; PSYCHOACOUSTICS; OPERANT CONDITIONING; CHIROPTERA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
K.H. Esser e R. Kiefer, "DETECTION OF FREQUENCY-MODULATION IN THE FM-BAT PHYLLOSTOMUS DISCOLOR", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 178(6), 1996, pp. 787-796

Abstract

In a two-alternative forced-choice procedure lesser spear-nosed bats,Phyllostomus discolor, had to discriminate between a pure tone stimulus and a sinusoidally frequency-modulated signal generated at the samecarrier frequency as the tone. Modulation depths of the SFM stimuli were reduced until the animals' performance dropped below the 75%-correct level which was used to determine difference limens for detection of frequency modulation (FMDL). The dependence of FMDLs on modulation and carrier frequency was systematically investigated. For a carrier frequency of 18.5 kHz, average FMDLs increased from 95 Hz at a modulation frequency of 10 Hz to 820 Hz at a modulation frequency of 2000 Hz which corresponds to Weber ratios (2 Delta f/f) of 0.005 and 0.044 respectively. Further, difference limens were found to increase linearly inproportion to carrier frequency throughout a major part (9-74 kHz) ofthe species' hearing range. In comparison to other mammals, P. discolor has a pronounced capability for frequency discrimination which might be related to the extensive use of individually distinct frequency-modulated communication calls and audio-vocal learning.

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Documento generato il 29/11/20 alle ore 05:19:26