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Flutter sensitivity in FM bats. Part I: delay modulation.

A Leonie Baier1,2, Lutz Wiegrebe3

  • 1Department Biology II, Ludwig Maximilians University Munich, Großhaderner Str. 2, 82152, Martinsried, Germany. baier@orn.mpg.de.

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
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Summary
This summary is machine-generated.

Bats use echo delay to sense distance, but wing flutter creates modulations. This study reveals bat sensitivity to echo delay modulation rates, identifying potential interference and rescue mechanisms.

Keywords:
BiosonarDopplerEcholocationVirtual targetWagon-wheel effect

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Area of Science:

  • Bioacoustics
  • Sensory Ecology
  • Animal Behavior

Background:

  • Echolocating bats determine target distance via the time delay between emitted calls and returning echoes.
  • Target movement, like insect wing flutter, causes echo delay modulations, which bats perceive.
  • Previous research focused on bat discrimination of flutter frequencies, not flutter magnitude.

Purpose of the Study:

  • To investigate bat sensitivity to echo delay modulations, specifically flutter magnitude, independent of call repetition rate.
  • To explore how modulation rate affects the perception of echo delay modulations in bats.
  • To understand the role of Doppler distortions in enhancing flutter sensitivity at high modulation rates.

Main Methods:

  • Utilized an auditory virtual reality system to generate controlled echo delay modulations mimicking insect wing flutter.
  • Presented these artificial echoes to the frequency-modulating (FM) bat, Phyllostomus discolor.
  • Analyzed bat sensitivity across a range of modulation rates.

Main Results:

  • Bat sensitivity to echo delay modulations is dependent on the modulation rate.
  • Optimal sensitivity was observed at rates below 20 Hz and above 50 Hz.
  • A phenomenon termed the 'echo-acoustic wagon-wheel effect' was proposed for slow modulations due to interference with call repetition rates.
  • Doppler distortions were shown to enhance flutter sensitivity at high modulation rates.

Conclusions:

  • Bat flutter sensitivity is modulated by the rate of echo delay changes.
  • The echo-acoustic wagon-wheel effect may impair flutter perception in FM bats at slow modulation rates.
  • Doppler distortions are crucial for flutter detection in FM bats, particularly at higher modulation frequencies, impacting hundreds of species worldwide.