By Lindsay Aitkin
This monograph advanced from years of study into the auditory pathway and listening to of many species of marsupials. Its functionality is to offer biologists, in par ticular neurobiologists, a large description and overview of what's recognized of the auditory sensory capacities and processing mechanisms during this huge order of mammals. My preliminary curiosity in marsupials constructed from collaborative paintings with Dr. Richard Gates at Monash and Melbourne Universities within the Seventies and by way of interest to whether thoughts concerning the auditory method was once inspired stemming from experiments often on household cats might be prolonged to mam mals of alternative orders. My next curiosity in Australian marsupials, aroused by means of collaboration with Dr. John Nelson at Monash college within the Eighties and Nineteen Nineties, involved their auditory platforms and behaviour consistent with se and never as primitive cousins of eutherians. extra lately, i've got collaborated with Dr. Bruce Masterton at Florida country college in reviews of latest global marsupials. His unhappy demise in 1996 has robbed neurobiologists of 1 of our such a lot provocative thinkers and speculation testers. i want to thank the dep. of body structure at Monash college for making many amenities on hand to me, the nationwide health and wellbeing and scientific examine of Australia and the Australian examine Council for offering cash for Council learn, and Jill Poynton and Michelle Mulholland, who illustrated this volume.
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Additional info for Hearing — the Brain and Auditory Communication in Marsupials
Sample text
I I Cl. 2. Relationship between call spectra and hearing range in a carnivorous marsupial. Power spectra of selected calls of the Northern quoll plotted as the percentage of energy above the stated frequency (right ordinate), compared with the audiogram from unit threshold data from the study of Aitkin et al. (1986b), to which the left ordinate (dB) relates. 5 kHz 34 audiogram; only the "sniff' call extends into the central part of the audiogram (Fig. 2). The behavioral audiogram of the opossum (Didelphis virginiana) demonstrates a best frequency of hearing between 16-32kHz (Ravizza et al.
Hopson 1966; Tumarkin 1968). The development of a threeossicle system improved the amplification imparted by the middle ear since the three bones, acting as a lever, could contribute extra gain to that provided by the 46 area difference between eardrum and stapes footplate. The presence of three bones rather than one does not fit easily the fact that mammals (excepting monotremes) have a much higher frequency response than birds (excepting owls) or reptiles, since the extra bones of mammals require extra mass and coupling.
Australis), head-body length 310mm. D Kowari (Dasyuroides byrneii), headbody length 175 mm. E Short-tailed grey opossum (Monodelphis domestica) , head-body length 150mm. The arrows point to the flap-like tragus visible in the kowari and the opossum. Acknowledgement is made to B. Phillips and Healesville Sanctuary, Healesville, Victoria, for the gliders (B,C) canal. 6 cm (Coles and Guppy 1986), the amplification would be greatest near 1000Hz; for the quoll, which is much smaller in size, the resonant frequency would be correspondingly higher.