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Author Spotlight: Investigating Vocal Information Representation in Small Primates and Its Alteration by Psychiatric Disorders Using Noninvasive EEG
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In-flight brainstem responses highlight the encoding of self-emitted echolocation calls in bats.

Yifat Chaya Tarnovsky1,2, Anton Sheinin3, Aharon Laufer2

  • 1School of Neurobiology, Biochemistry and Biophysics, Tel Aviv University, Tel Aviv, Israel.

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Summary

Bats

Keywords:
active sensingauditory brainstem responsebatsecholocation

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Area of Science:

  • Neuroscience
  • Bioacoustics
  • Animal Behavior

Background:

  • Echolocating bats use precise auditory processing for navigation and foraging.
  • Neural encoding of self-vocalizations is crucial for comparing outgoing calls with returning echoes.

Purpose of the Study:

  • To introduce a non-invasive method for recording auditory brainstem responses (ABRs) in awake, flying bats.
  • To investigate the neural encoding of self-emitted echolocation calls in bats.

Main Methods:

  • Developed a custom 3D-printed harness for sustained in-place flight in bats.
  • Simultaneously recorded electroencephalographic and acoustic signals from freely vocalizing bats.
  • Analyzed single-trial auditory brainstem responses (ABRs) and their correlation with call acoustics.

Main Results:

  • Self-emitted echolocation calls reliably evoked ABRs, including a pre-auditory wave.
  • Significant correlations found between call acoustic properties and ABR amplitude/latency.
  • Demonstrated dynamic encoding of vocalization characteristics in the bat auditory brainstem.

Conclusions:

  • The bat auditory system dynamically encodes outgoing vocalizations, with early information extraction in the brainstem.
  • The novel recording method facilitates research on sensory-motor integration in behaving animals.