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Related Experiment Videos

Target flutter rate discrimination by bats using frequency-modulated sonar sounds: behavior and signal processing

A Grossetête1, C F Moss

  • 1Department of Psychology, Harvard University, Cambridge, Massachusetts 02138, USA.

The Journal of the Acoustical Society of America
|May 5, 1998
PubMed
Summary

Bats use sonar echoes to detect insect wingbeat rates. Doppler shifts in echoes from fluttering targets help bats distinguish prey movement speeds, aiding in insect prey detection.

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Sensory Ecology

Background:

  • Bats (order Chiroptera) navigate and hunt using echolocation.
  • Distinguishing insect prey relies on processing complex sonar echo information.
  • Wingbeat rate is a key parameter for identifying flying insects.

Purpose of the Study:

  • To investigate how bats (order Chiroptera) use sonar echoes to discriminate insect wingbeat rates.
  • To understand the role of target flutter in echolocation-based prey detection.
  • To correlate acoustical properties of echoes with bat perceptual performance.

Main Methods:

  • Psychophysical experiments with trained bats discriminating artificial fluttering targets.
  • Acoustical measurements of sonar echoes from targets simulating insect wingbeats.

Related Experiment Videos

  • Simulations to model echo characteristics and their relation to flutter rate.

    • Main Results:

    • Bat discrimination performance varied with reference wingbeat rates (9 Hz at 30 Hz, 14 Hz at 50 Hz).
    • Acoustical analysis revealed Doppler shifts and altered echo arrival times correlated with flutter rate.
    • Simulations indicated reduced echo bandwidth at higher flutter rates.

    Conclusions:

    • Doppler-induced echo delay changes are likely cues for bats detecting wingbeat rate.
    • Fluttering targets provide crucial information for FM bats to perceive flying insect prey.
    • This study enhances understanding of bat echolocation and sensory processing.