Results 151 to 160 of about 1,758 (185)
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2008
This chapter examines the structure and function of hearing and the auditory system in fishes and marine mammals. Hearing is considered in terms of the evolution of the vertebrate auditory system in fishes and the readaption of mammals to the aquatic environment.
Popper, A., Ketten, Darlene
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This chapter examines the structure and function of hearing and the auditory system in fishes and marine mammals. Hearing is considered in terms of the evolution of the vertebrate auditory system in fishes and the readaption of mammals to the aquatic environment.
Popper, A., Ketten, Darlene
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Origin of underwater hearing in whales
Nature, 1993All described fossil and Recent cetaceans have relatively similar ear bones (malleus, incus and stapes) that strongly diverge from those of land mammals. Here we report that the hearing organ of the oldest whale, Pakicetus, is the only known intermediate between that of land mammals and aquatic cetaceans (whales, dolphins and porpoises).
J G, Thewissen, S T, Hussain
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Experiments on the mechanism of underwater hearing
Acta Oto-Laryngologica, 2011The findings suggest that underwater sound perception is realized by the middle ear rather than by bone conduction, at least in shallow water conditions.To prove whether underwater sound perception is effected by bone conduction or by conduction via the middle ear.Five divers, breathing through snorkels, were tested in a swimming pool, to determine ...
Hans Wilhelm, Pau +5 more
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Biophysics of Underwater Hearing in Anuran Amphibians
Journal of Experimental Biology, 1982ABSTRACTA standing wave tube apparatus was used to determine the biophysical basis of underwater hearing sensitivity in 3 species of Rana and in Xenopus laevis. A speaker inside the base of a vertical, water-filled 3 m steel pipe produced standing waves.
T E, Hetherington, R E, Lombard
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Biophysics of underwater hearing in the clawed frog, Xenopus laevis
Journal of Comparative Physiology A, 1992Anesthetized clawed frogs (Xenopus laevis) were stimulated with underwater sound and the tympanic disk vibrations were studied using laser vibrometry. The tympanic disk velocities ranged from 0.01 to 0.5 mm/s (at a sound pressure of 2 Pa) in the frequency range of 0.4-4 kHz and were 20-40 dB higher than those of the surrounding tissue.
Christensen-Dalsgaard, J, Elepfandt, A
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Reliability of underwater hearing thresholds in pinnipeds
Acoustics Research Letters Online, 2005Repeated measures of low-frequency underwater hearing sensi- tivity in individuals of three pinniped species tested over 4-7 years are pre- sented. Despite changes in the experience of the subjects and certain testing parameters (e.g., equipment and research personnel), measured underwater hearing thresholds within subjects over relatively long periods
Brandon L. Southall +3 more
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Towards a fish-inspired underwater hearing device
SPIE Proceedings, 2014We draw inspiration from the fish “hearing” organ, the otolith, to create a portable engineering device that can augment a human diver’s ability to hear underwater. The otolith is an inertial displacement sensor, consisting of a dense bony mass that acts as a reference to the surrounding sensory hair cells. The challenges in adapting the otolith into
Tony C. H. Tse +3 more
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Sounding out underwater hearing
Trends in Neurosciences, 2001Hearing by Whales and Dolphinsedited by W.W.L. Au, A.N. Popper and R.R. Fay, Springer-Verlag, 2000. £89.50 (490 pages) ISBN 0387 949 062The song of the humpback whale and the whistles of the TV star ‘Flipper’ have excited popular imagination to some aspects of the bioacoustic behavior of whales and dolphins.
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2016
The hearing of turtles is poorly understood compared with the other reptiles. Although the mechanism of transduction of sound into a neural signal via hair cells has been described in detail, the rest of the auditory system is largely a black box. What is known is that turtles have higher hearing thresholds than other reptiles, with best frequencies ...
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The hearing of turtles is poorly understood compared with the other reptiles. Although the mechanism of transduction of sound into a neural signal via hair cells has been described in detail, the rest of the auditory system is largely a black box. What is known is that turtles have higher hearing thresholds than other reptiles, with best frequencies ...
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Underwater hearing sensitivity of two ringed seals (Pusa hispida)
Canadian Journal of Zoology, 1975Minimum audible field, underwater audiograms from 1 to 90 kHz were obtained for two ringed seals (Pusa hispida). The audiograms exhibited a uniform sensitivity, to within ± 7 dB, in the frequency range 1 to 45 kHz. Above 45 kHz the threshold increased at a rate of 60 dB per octave. The lowest threshold was −32 dB relative to 1 μbar (68 dB re 1 μPa) at
J M, Terhune, K, Ronald
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