Abstract
A behavioral response paradigm was used to measure masked underwater hearing thresholds in a bottlenose dolphin (Tursiops truncatus) and white whale (Delphinapterus leucas) within the far field and hydrodynamic near field of an underwater sound projector. Masked hearing thresholds at 100 and 300 Hz were measured at source distances of 1, 2, and 4 m; over these distances the specific acoustic impedance ratio varied from approximately −10 to 0 dB at 100 Hz and −3 to 0 dB at 300 Hz. Individual hearing test trials consisted of a 3.5-s noise burst alone (N) or a noise burst along with a 1-s tone (S+N). Subjects were trained to produce an audible whistle in response to S+N trials and to remain silent for N trials. Thresholds were estimated using an up–down staircase procedure. Preliminary results indicate no significant differences between thresholds measured at the three different source distances for either test subject. [Work supported by ONR.]
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