Echolocation: Discrimination of targets by the bat, Eptesicus fuscus
- Permanent Link:
- Echolocation: Discrimination of targets by the bat, Eptesicus fuscus
- Series Title:
- Journal of Experimental Zoology
- Simmons, James A.
Vernon, Jack A.
- Publication Date:
- Subjects / Keywords:
- Eptesicus Fuscus ( local )
Bats ( local )
Targets ( local )
Discrimination ( local )
- serial ( sobekcm )
- Bats of the species Eptesicus fuscus learned to discriminate differences in the size of targets, the shape of targets, and the distance to targets by means of sonar. Eptesicus can detect differences of as little as 17% in the surface area of triangular targets. Measurements of the echo properties of the targets suggest that the bats used differences in the overall intensity of the echoes to differentiate the larger triangle from the smaller. If so, the smallest detectable echo intensity difference for Eptesicus would be between 1.5 and 3.0 dB. In discriminating a tall, narrow triangle from a short, wide triangle the bats may have scanned the target shapes with the directional beam of their sonar to produce discriminable intensity differences between echoes. Eptesicus can discriminate between targets differing by as little as 12 to 13 mm in distance. If echo travel time is providing the bat with target range information, then the bat evidently can detect echo arrivalâ€time differences of as little as 70 to 75 Î¼sec. The ability of the bat to discriminate between targets which produce echoes that arrive at the bat's ears overlapping each other for 90 to 100% of their total duration demonstrates the effectiveness of the mechanisms in the bat's sonar for rejecting interference caused by multipleâ€target clutter.
- Original Version:
- Journal of Experimental Zoology, Vol. 176, no. 3 (1971-03).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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