Four odontocete species change hearing levels when warned of impending loud sound

Integrative Zoology
Paul E NachtigallRonald A Kastelein

Abstract

Hearing sensitivity change was investigated when a warning sound preceded a loud sound in the false killer whale (Pseudorca crassidens), the bottlenose dolphin (Tursiops truncatus), the beluga whale (Delphinaperus leucas) and the harbor porpoise (Phocoena phocoena). Hearing sensitivity was measured using pip-train test stimuli and auditory evoked potential recording. When the test/warning stimuli preceded a loud sound, hearing thresholds before the loud sound increased relative to the baseline by 13 to 17 dB. Experiments with multiple frequencies of exposure and shift provided evidence of different amounts of hearing change depending on frequency, indicating that the hearing sensation level changes were not likely due to a simple stapedial reflex.

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Citations

Jan 3, 2020·The Journal of the Acoustical Society of America·Tobias SchaffeldUrsula Siebert
Mar 14, 2020·The Journal of Experimental Biology·Thomas GötzVincent M Janik
May 4, 2020·The Journal of the Acoustical Society of America·S Bruce MartinDavid R Barclay
Sep 3, 2020·The Journal of the Acoustical Society of America·Ronald A KasteleinDarlene R Ketten
Jul 2, 2018·The Journal of the Acoustical Society of America·Ronald A KasteleinRobin Gransier
Sep 3, 2020·The Journal of the Acoustical Society of America·Roel A J MüllerMichael A Ainslie

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