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Titolo:
DISCRIMINATION OF SINUSOIDALLY FREQUENCY-MODULATED SOUND SIGNALS MIMICKING SPECIES-SPECIFIC COMMUNICATION CALLS IN THE FM-BAT PHYLLOSTOMUS DISCOLOR
Autore:
ESSER KH; LUD B;
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: 5, volume: 180, anno: 1997,
pagine: 513 - 522
SICI:
0340-7594(1997)180:5<513:DOSFSS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
NOSED BAT; AUDITORY-CORTEX; HORSESHOE BATS; VOCALIZATIONS; CHIROPTERA; AMPLITUDE; HEARING;
Keywords:
HEARING; PSYCHOACOUSTICS; COMMUNICATION CALLS; VOCAL SIGNATURE; CHIROPTERA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
K.H. Esser e B. Lud, "DISCRIMINATION OF SINUSOIDALLY FREQUENCY-MODULATED SOUND SIGNALS MIMICKING SPECIES-SPECIFIC COMMUNICATION CALLS IN THE FM-BAT PHYLLOSTOMUS DISCOLOR", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 180(5), 1997, pp. 513-522

Abstract

In the lesser spear-nosed bat, Phyllostomus discolor, maternal directive calls are characterized by an individual type of sinusoidal frequency modulation (= SFM) pattern. Beside modulation frequency, modulation depth, carrier frequency, and number of modulation cycles per call contribute to the mother's vocal signature. Since juvenile P. discolor learn to adapt their isolation calls to the corresponding call characteristics of the own mother or even to playback of a computer-stored directive call, if hand-reared in the absence of conspecifics, the bats'auditory system ought to be able to resolve interindividual differences in communication call structure. However, quantitative psychoacoustic data on the discrimination of SFM signals in this species are not available. Thus, in the present study, lesser spear-nosed bats were trained in a two-alternative forced-choice procedure to discriminate between two alternatingly presented SFM sound signals differing in modulation frequency. Other characteristics of acoustic stimuli were identical and designed to mimick the fundamental of species-specific calls. Bygradually reducing the difference in modulation frequency between both stimuli within the behavioural relevant range until the animals' performance dropped below the 75%-correct level, a considerable auditory spectro-temporal resolution has been revealed. Particularly in comparison to the overall interindividual variation of this call parameter (minimal modulation frequency = 49 Hz, maximum 100 Hz), the determined average difference limen for modulation frequency of 2.42 +/- 0.29 Hz seems substantial and sufficient for labelling individuals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 06:38:28