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Cochlear resonance in the mustached bat: behavioral adaptations.

O W Henson1, P A Koplas, A W Keating

  • 1Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill 27599.

Hearing Research
|December 1, 1990
PubMed
Summary

Mustached bats utilize cochlear resonance to enhance their biosonar, fine-tuning echo reception. This resonance system aids in compensating for Doppler shifts and micromechanical changes during flight.

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Area of Science:

  • Bioacoustics
  • Auditory Neuroscience
  • Animal Sonar

Background:

  • Mustached bats (Pterononotus p. parnellii) employ sophisticated biosonar with specific frequencies.
  • Their auditory system exhibits specialized adaptations, particularly around 60 kHz, linked to cochlear resonance.

Purpose of the Study:

  • To investigate the role and characteristics of cochlear resonance in mustached bats' biosonar perception.
  • To understand how cochlear resonance interacts with Doppler-shift compensation and flight dynamics.

Main Methods:

  • Stimulation of bat cochleae with sounds and broadband noise near resonance frequencies.
  • Observation of resonance phenomena, including persistence and frequency changes.
  • Analysis of Doppler-shift compensation during simulated flight under resonant conditions.

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Main Results:

  • Cochlear resonance is elicited by sounds near 60 kHz and persists after stimulus cessation.
  • Doppler-shifted echoes can induce cochlear resonance, which does not impede flight-related compensation.
  • Resonance frequency shifts occur during and after flight, influenced by body temperature.

Conclusions:

  • Mustached bats actively adjust biosonar frequencies to maintain echo reception within a critical band near cochlear resonance.
  • They employ a dual compensation strategy: correcting for target-relative Doppler shifts and for cochlear micromechanical changes via resonance.