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Auditory sensitivity and psychophysical tuning curves in the elephant nose fish,Gnathonemus petersii

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Summary

Hearing sensitivity and psychophysical tuning curves were determined for the mormyridGnathonemus petersii. Pure tone hearing thresholds were determined from 100 Hz to 2,500 Hz, with best sensitivity being about −31 dB (re: 1 dyne/ cm2) from 300 Hz to 1,000 Hz. In order to determine frequency tuning of the auditory system, psychophysical tuning curves (PTC's) were measured with the masker presented simultaneously with, or just ahead of, the 500 Hz test signal. The sound level for different frequencies needed to just mask the test tone were determined from 100 to 800 Hz. Maximum masking occurred in both forward and simultaneous conditions when the masker and the test tone were at the same frequency. As the masker was moved in frequency from 500 Hz, higher sound levels of maskers were needed to afford masking of the test tone. The data were similar in simultaneous and forward masking, with theQ 10 dB, a measure of sharpness of tuning, being about 5 in both cases. Data were compared for other species for which behavioral thresholds and PTC's are available.Gnathonemus hears about as wide a range of frequencies as the goldfish,Carassius auratus, although the PTC's for the two species are strikingly different. The PTC's forGnathonemus resemble those determined in a forward-masking paradigm for the clown knife fish,Notopterus chitala, even thoughGnathonemus has a wider hearing bandwidth.

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Abbreviations

AM :

amplitude modulated

EOD :

electric organ discharge

PTC :

psychophysical tuning curve

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  1. Department of Anatomy, Schools of Medicine and Dentistry, Georgetown University, 3900 Reservoir Rd, 20007, Washington, District of Columbia, N.W., USA

    Catherine A. McCormick & Arthur N. Popper

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  1. Catherine A. McCormick
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  2. Arthur N. Popper
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McCormick, C.A., Popper, A.N. Auditory sensitivity and psychophysical tuning curves in the elephant nose fish,Gnathonemus petersii . J. Comp. Physiol. 155, 753–761 (1984). https://doi.org/10.1007/BF00611592

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