Accession Number:

ADA265890

Title:

Comparison of Sonar Discrimination by an Echolocating Dolphin and a Counterpropagation Neural Network

Descriptive Note:

Corporate Author:

NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA

Personal Author(s):

Report Date:

1992-09-01

Pagination or Media Count:

6.0

Abstract:

The capability of an Atlantic bottlenose dolphin to discriminate wall thickness differences of hollow cylinders by echolocation was studied by Au and Pawloski 1992. A standard cylinder of 6.35 cm wall thickness was compared with cylinder shaving wall thickness that differed from the standard or - 0.2, or - 0.3, or - 0.4, and or - 0.8 mm. All cylinders had an O.D. of 37.85 mm, and a length of 12.7 cm. The standard and a comparison target, separated by an angle of or - 11 deg, were presented simultaneously at a range of 8 m and the dolphin was required to indicate the location of the standard target. The standard was paired with a different comparison target for ten consecutive trial apiece. The experiment was conducted in the free field and in the presence of broadband masking noise

Subject Categories:

  • Anatomy and Physiology
  • Biological Oceanography
  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE