Auditory Weighting Functions and Frequency-Dependent Effects of Sound in Bottlenose Dolphins (Tursiops truncatus)

reportActive / Technical Report | Accession Number: ADA531234 | Open PDF

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 onsetgrowth 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.

Author(s):
Finneran, James P.
Author Organization(s):
SPACE AND NAVAL WARFARE SYSTEMS CENTER PACIFIC SAN DIEGO CA
Descriptive Note:
Annual rept.
Pagination:
0009

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
MIPR-N0001409WX20358
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_1.3_Human Capital Management; JCA_1.2.1_Training; JCA_1.3.2_Personnel Management; JCA_6_Net Centric; JCA_8_Building Partnerships
Communities of Interest:
Weapons Technologies
Descriptor(s):
*THRESHOLD EFFECTS, *DOLPHINS(MAMMALS), *AUDIOMETRY, *FATIGUE(PHYSIOLOGY), *NOISE(SOUND), *HEARING, *THRESHOLDS(PHYSIOLOGY), *RADIOFREQUENCY, ELECTROPHYSIOLOGY, SOUND PRESSURE, BIOACOUSTICS, EXPOSURE(PHYSIOLOGY), HYDROPHONES, WEIGHTING FUNCTIONS, AUDITORY DEFECTS, MEASUREMENT
Field(s)/Group(s):
Biology, Anatomy and Physiology, Acoustics, Radiofrequency Wave Propagation
Keyword(s):
*AUDITORY WEIGHTING FUNCTIONS, *NOISE EXPOSURE, *TEMPORARY THRESHOLD SHIFT, ANTHROPOGENIC SOUND, MANMADE SOUND, AUDITORY EVOKED POTENTIALS, HIGH FREQUENCY HEARING LOSS, BEHAVIORAL HEARING TESTS, LOUDNESS COMPARISON TESTS, SPL(SOUND PRESSURE LEVEL), SEL(SOUND EXPOSURE LEVEL), BOTTLENOSE DOLPHINS, HEARING MEASUREMENT
Report Date:
2009 Sep 30
Creation Date:
2010 Nov 10