Neural Mechanisms for Target Ranging in an Echolocating Bat Eptesicus fuscus

  • Albert Feng
  • James A. Simmons
  • Shelley A. Kick
  • Beatrice D. Lawrence
Part of the NATO Advanced Study Institutes Series book series (volume 28)

Abstract

We have concluded a series of behavioral, anatomical and physiological experiments in order to gain a better understanding of the neural basis of target ranging in Eptesicus fuscus. Behaviorally, we were interested in learning whether or not binaural integration is essential for ranging. We trained two bats to perform range discrimination using two-choice paradigms (Simmons, 1973) until they reached a criterion of 85% correct responses. We then observed their performance under intact conditions and when one ear was occluded. Occlusion was effected by inserting silicone grease to fill the ear canal of the selected ear. The performance of these two bats under monaural and binaural conditions is shown in Table 1. We found that the performance under monaural conditions was not significantly different from that of intact conditions (p<0.05, Hoel test for the difference of two means). Thus, bilateral interactions, which are essential for encoding directional information about the target, are not required for ranging in this species. Instead, time or intensity information from target echoes is more important for ranging.

Keywords

Sonar Grease 

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References

  1. Feng, A. S., Simmons, J. A., and Kick, S. A., 1978, Echo detection and target-ranging neurons in the auditory system of the bat Eptesicus fuscus, Science, 202:645.CrossRefGoogle Scholar
  2. Simmons, J.A., 1973, The resolution of target range by echolocating bats, J. Acous. Soc. Amer., 54:157.CrossRefGoogle Scholar
  3. Suga, N., and O’Neill, W. E., 1979, Auditory processing of echoes, part II. Representation of acoustic information from the environment in the bat cerebral cortex (this volume).Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Albert Feng
  • James A. Simmons
  • Shelley A. Kick
  • Beatrice D. Lawrence

There are no affiliations available

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