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Doppler-shift compensation behavior in horseshoe bats revisited: auditory feedback controls both a decrease and an

Walter Metzner1, Shuyi Zhang, Michael Smotherman

  • 1Department of Biology, University of California at Riverside, Riverside, CA 92521-0427, USA. metzner@ucla.edu

The Journal of Experimental Biology
|May 10, 2002
PubMed
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Horseshoe bats adjust echolocation calls to Doppler shifts. This study reveals bats use both inhibitory and excitatory auditory feedback, challenging previous assumptions about audio-vocal control mechanisms in mammals.

Area of Science:

  • Bioacoustics
  • Neuroethology
  • Auditory Neuroscience

Background:

  • Echolocation in bats demonstrates sophisticated audio-vocal feedback control.
  • The precise mechanisms of audio-vocal integration in mammals remain largely unknown.
  • Bats adjust echolocation call parameters based on returning echo signals.

Purpose of the Study:

  • To investigate the audio-vocal control mechanism in echolocating horseshoe bats (Rhinolophus ferrumequinum).
  • To examine how bats compensate for frequency shifts in echoes caused by Doppler effects.
  • To challenge existing models of Doppler-shift compensation behavior.

Main Methods:

  • Behavioral experiments were conducted on echolocating horseshoe bats.
  • The study analyzed the bats' adjustments to echolocation call frequencies in response to simulated echo frequency shifts.

Related Experiment Videos

  • Specific focus was placed on responses to both positive (frequency increase) and negative (frequency decrease) Doppler shifts.

    • Main Results:

    • Horseshoe bats actively compensate for both positive and negative Doppler shifts in echoes.
    • Compensation for positive shifts (95%) is significantly more complete than for negative shifts (22%).
    • The findings suggest a novel antagonistic audio-vocal control mechanism involving both inhibitory and excitatory feedback.

    Conclusions:

    • Doppler-shift compensation in horseshoe bats is more complex than previously assumed, involving a push/pull feedback principle.
    • The results challenge the notion of solely inhibitory feedback for positive Doppler shifts.
    • This study provides crucial insights into the neural basis of audio-vocal feedback control in bats and potentially other mammals.