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Bats use echo harmonic structure to distinguish their targets from background clutter.

Mary E Bates1, James A Simmons, Tengiz V Zorikov

  • 1Department of Cognitive, Linguistic, and Psychological Sciences, Box 1853, Brown University, Providence, RI 02912, USA. maryebates@gmail.com

Science (New York, N.Y.)
|July 30, 2011
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Summary

Big brown bats use harmonic echoes to avoid confusing clutter, sacrificing precise delay perception for clearer target identification in complex environments.

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Area of Science:

  • Bioacoustics
  • Sensory Ecology
  • Animal Behavior

Background:

  • Echolocating bats face challenges in cluttered environments, where side echoes can mask target echoes.
  • The first and second harmonics of bat sonar signals have different directional beaming properties.

Purpose of the Study:

  • To investigate how big brown bats utilize harmonic information to distinguish between target and clutter echoes.
  • To understand the trade-off between echo delay perception and clutter suppression in bat echolocation.

Main Methods:

  • Psychophysical experiments were conducted with big brown bats.
  • Electronic manipulation of first and second harmonic alignment in artificial echoes mimicked neural processing of clutter echoes.
  • Bat performance in echo-delay perception and clutter masking was assessed.

Main Results:

  • Misaligning harmonics disrupted echo-delay perception but reduced clutter masking.
  • Realigning harmonics restored delay perception but also reinstated clutter interference.
  • Bats demonstrated a strategy of sacrificing delay acuity to mitigate masking.

Conclusions:

  • Big brown bats exploit differences in harmonic content to differentiate clutter from target echoes.
  • This harmonic exploitation allows bats to improve target detection in complex environments at the cost of precise delay resolution.