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  • Title: Atlantic bottlenose dolphin (Tursiops truncatus) hearing threshold for brief broadband signals.
    Author: Au WW, Lemonds DW, Vlachos S, Nachtigall PE, Roitblat HL.
    Journal: J Comp Psychol; 2002 Jun; 116(2):151-7. PubMed ID: 12083609.
    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.
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