Auditory Weighting Functions and Frequency-Dependent Effects of Sound in Bottlenose Dolphins (Tursiops truncatus)
Abstract
The long-term goal of this effort is to develop meaningful auditory weighting functions for marine mammals. These weighting functions would improve assessments of the effects of anthropogenic sound by emphasizing frequencies to which animals are most sensitive and de-emphasizing those to which they are not. The specific objective of this effort is to develop auditory weighting functions for bottlenose dolphins with normal hearing and high-frequency hearing loss. The weighting functions would be defined by measuring subjective loudness and temporary threshold shift (TTS) as functions of the sound frequency. The specific objectives for FY09 were as follows: (1) to determine TTS onset/growth as a function of frequency for 16-s tones using single and multiple auditory evoked potential (AEP) and behavioral measurements in a bottlenose dolphin with high-frequency hearing loss, and (2) determine equal loudness contours using behavioral methods in a second bottlenose dolphin with good high-frequency hearing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2009
- Accession Number
- ADA531234
Entities
People
- James P. Finneran
Organizations
- Naval Information Warfare Systems Command