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Biosonar navigation above water I: estimating flight height.

Susanne Hoffmann1, Daria Genzel2, Selina Prosch2

  • 1Department Biology II, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany; Chair of Zoology, Technische Universität München, Freising-Weihenstephan, Germany susanne.hoffmann@wzw.tum.de.

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Echolocating bats use their tragus to precisely adjust flight height by interpreting spectral interference patterns in echoes. This reveals neural mechanisms for 3D biosonar navigation.

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Area of Science:

  • Neuroscience
  • Bioacoustics
  • Animal Behavior

Background:

  • 3D navigation is crucial for flying animals, requiring precise control of flight height.
  • Echolocating bats exhibit remarkable vertical navigation skills, particularly when drinking from water surfaces.
  • Understanding the sensory and neural basis of this vertical navigation is key to deciphering 3D biosonar capabilities.

Purpose of the Study:

  • To investigate the biophysical and neural mechanisms underlying vertical plane navigation in echolocating bats.
  • To determine the role of the tragus in processing acoustic elevation cues for flight height adjustment.
  • To elucidate how spectral interference patterns in echoes are used for 3D spatial orientation.

Main Methods:

  • Behavioral experiments with Phyllostomus discolor bats to assess flight height adjustments.
  • Analysis of head-related transfer functions to identify tragus-induced spectral modifications.
  • Electrophysiological recordings of cortical neurons to map spatial receptive fields and temporal responses.
  • Investigation of neural tuning to specific echo frequencies and elevation cues.

Main Results:

  • Bat flight height adjustment is dependent on the tragus, which creates elevation-specific spectral interference patterns.
  • These interference patterns are most prominent around 55 kHz and are reflected in neural tuning.
  • Cortical neurons exhibit sharp tuning to 55 kHz and show specific spatiotemporal responses to echoes from low elevations.
  • Neural data reveal processing of acoustic elevation cues essential for vertical navigation.

Conclusions:

  • The tragus acts as a critical biosonar component for perceiving acoustic elevation.
  • Specific neural circuits in the cortex process these spectral cues for precise vertical flight control.
  • This study provides novel insights into the neural basis of 3D navigation using biosonar in bats.