A comparative study of hearing ability in fishes: the auditory brainstem response approach |
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| Authors: | T N Kenyon F Ladich H Y Yan |
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| Institution: | (1) T.H. Morgan School of Biological Sciences, University of Kentucky, Lexington, KY 40506-0225, USA Fax: + 1-606 257-7410; e-mail: hyyan00@pop.uky.edu, US;(2) University of Vienna, Institute of Zoology, Althanstrasse 14, A-1090 Wien, Austria, AT |
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| Abstract: | Auditory brainstem response (ABR) techniques, an electrophysiological far-field recording method widely used in clinical evaluation
of human hearing, were adapted for fishes to overcome the major limitations of traditional behavioral and electrophysiological
methods (e.g., invasive surgery, lengthy training of fishes, etc.) used for fish hearing research. Responses to clicks and
tone bursts of different frequencies and amplitudes were recorded with cutaneous electrodes. To evaluate the effectiveness
of this method, the auditory sensitivity of a hearing specialist (goldfish, Carassius auratus) and a hearing generalist (oscar, Astronotus ocellatus) was investigated and compared to audiograms obtained through psychophysical methods. The ABRs could be obtained between
100 Hz and 2000 Hz (oscar), and up to 5000 Hz (goldfish). The ABR audiograms are similar to those obtained by behavioral methods
in both species. The ABR audiogram of curarized (i.e., Flaxedil-treated) goldfish did not differ significantly from two previously
published behavioral curves but was lower than that obtained from uncurarized fish. In the oscar, ABR audiometry resulted
in lower thresholds and a larger bandwidth than observed in behavioral tests. Comparison between methods revealed the advantages
of this technique: rapid evaluation of hearing in untrained fishes, and no limitations on repeated testing of animals.
Accepted: 8 August 1997 |
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| Keywords: | Fishes Audiometry Auditory brainstem response Evoked potentials Hearing sensitivity |
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