Atlantic bottlenose dolphin (Tursiops truncatus) hearing threshold for brief broadband signals. |
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Authors: | Au, Whitlow W. L. Lemonds, David W. Vlachos, Stephanie Nachtigall, Paul E. Roitblat, Herbert L. |
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Abstract: | The hearing sensitivity of an Atlantic bottlenose dolphin (Tursiops truncatus) to both pure tones and broadband signals simulating echoes from a 7.62-cm water-filled sphere was measured. Pure tones with frequencies between 40 and 140 kHz in increments of 20 kHz were measured along with broadband thresholds using a stimulus with a center frequency of 97.3 kHz and 88.2 kHz. The pure-tone thresholds were compared with the broadband thresholds by converting the pure-tone threshold intensity to energy flux density. The results indicated that dolphins can detect broadband signals slightly better than a pure-tone signal. The broadband results suggest that an echolocating bottlenose dolphin should be able to detect a 7.62-cm diameter water-filled sphere out to a range of 178 m in a quiet environment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
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Keywords: | hearing sensitivity thresholds pure tones broadband signals echolocation bottlenose dolphin Tursiops truncatus |
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