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Titolo:
HEARING, VOCALIZATION AND THE EXTERNAL EAR OF A MARSUPIAL, THE NORTHERN QUOLL, DASYURUS-HALLUCATUS
Autore:
AITKIN LM; NELSON JE; SHEPHERD RK;
Indirizzi:
MONASH UNIV,DEPT PHYSIOL CLAYTON VIC 3168 AUSTRALIA MONASH UNIV,DEPT ECOL & EVOLUTIONARY BIOL CLAYTON VIC 3168 AUSTRALIA UNIV MELBOURNE,DEPT OTOLARYNGOL MELBOURNE VIC AUSTRALIA
Titolo Testata:
Journal of comparative neurology
fascicolo: 3, volume: 349, anno: 1994,
pagine: 377 - 388
SICI:
0021-9967(1994)349:3<377:HVATEE>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
RATS RATTUS-NORVEGICUS; BRAIN-STEM RESPONSE; INFERIOR COLLICULUS; LEVEL DIFFERENCES; EVOKED-RESPONSE; DOMESTIC CAT; NEURONS; FERRET; PINNA; REPRESENTATION;
Keywords:
AUDIOGRAM; ADULTS; POUCH-YOUNG; SPECTRA; PINNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
L.M. Aitkin et al., "HEARING, VOCALIZATION AND THE EXTERNAL EAR OF A MARSUPIAL, THE NORTHERN QUOLL, DASYURUS-HALLUCATUS", Journal of comparative neurology, 349(3), 1994, pp. 377-388

Abstract

As part of a continuing study of the development of the marsupial auditory system, auditory brainstem responses (ABR) were recorded and an ABR audiogram was constructed for five female Northern Quells (Dasyurus hallucatus), which are nocturnal carnivores. The best frequency for hearing lies between 8 and 10 kHz, and at 50 dB SPL there is a range from about 0.5 to 40 kHz. Vocalizations of adult quells and pouch-youngwere recorded with a digital audio tape recorder, and the power spectra of representative calls were compared with the ABR audiogram. The common adult vocalizations have most energy at the lower end of the hearing range, whereas frequencies that are dominant in the isolation calls of the pouch-young lie close to the best frequency of hearing.Samples of nocturnal sounds of the habitat of the quoll were also recorded and analyzed. Power spectra have peak energy at frequencies between 2 and 5 kHz, with a smaller contribution above 10 kHz. The spectrum contains relatively little power at the best frequency of hearing. Measurements of the sound pressure level at the external ear canal as a function of stimulus frequency and location in space suggest that the directional amplifying properties of the pinna will operate most effectively on sound frequencies at the upper end of the quoll's hearing range, a region that may be important in prey detection. Comparisons are madewith other mammalian nocturnal carnivores and with other marsupials. We speculate that, for nocturnal carnivores, one role of the low-frequency part of the hearing range concerns the recognition of adult conspecifics, the mid-frequency range is important for the detection of pouch-young, and the upper range may be particularly concerned with prey/predator detection. (C) 1994 Wiley-Liss, Inc.

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Documento generato il 23/09/20 alle ore 16:10:11