Accession Number:

ADA076206

Title:

Thermal-Noise Limit in Delphinid Hearing.

Descriptive Note:

Interim rept. Jan 78-Apr 79,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Johnson,C. S.

Report Date:

1979-06-01

Pagination or Media Count:

7.0

Abstract:

In quiet experimental tanks, thermal noise is the dominant noise source above 50 kHz. Evidence indicates that in the frequency range above 50 kHz cetacean auditory thresholds are limited by thermal noise. Data were compared for Tursiops, Phocoena, Inia, and Delphinaptera.

Descriptors:

• *AUDITORY PERCEPTION
• LIMITATIONS
• NOISE
• THRESHOLDS(PHYSIOLOGY)
• LOW FREQUENCY
• DOLPHINS(MAMMALS)
• PORPOISES

Subject Categories:

• Biological Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE