Abstract
A behavioral response paradigm was used to measure masked underwater hearing thresholds in a bottlenose dolphin (Tursiops truncatus) and white whale (Delphinapterus leucas) before and after exposure to single underwater impulses produced by a seismic watergun. Hearing thresholds were measured at 0.4, 4, and 30 kHz using a vocal response technique and a modified version of the Method of Free Response. A pre-exposure threshold was generally measured 34 min before presentation of the impulse. Post-exposure threshold measurements began within 2 min of exposure to the impulse and continued for approximately 20 min following exposure, in order to track recovery. A masked temporary threshold shift (MTTS) was defined as a 6-dB or larger increase in threshold compared to the corresponding pre-exposure measurement. The MTTS test paradigm will be discussed and preliminary MTTS and behavioral response data presented and compared to existing TTS data for odontocetes. [Work supported by ONR.]
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