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Related Experiment Videos

Perception of echo phase information in bat sonar.

J A Simmons

    Science (New York, N.Y.)
    |June 22, 1979
    PubMed
    Summary

    Echolocating bats can detect tiny 500-nanosecond echo arrival time changes. This auditory processing relies on time-domain information, creating acoustic images from sound periodicity.

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    Area of Science:

    • Bioacoustics
    • Neuroethology
    • Sensory Neuroscience

    Background:

    • Bats utilize echolocation for navigation and hunting.
    • Understanding bat auditory processing reveals principles of biological sonar.

    Purpose of the Study:

    • To investigate the precision of echolocating bats' temporal processing.
    • To determine the relationship between echo timing variations and bat detection capabilities.

    Main Methods:

    • Psychophysical experiments with Eptesicus fuscus bats.
    • Analysis of bat performance against varying echo arrival time jitter.
    • Modeling bat auditory processing using cross-correlation functions.

    Main Results:

    • Bats detect arrival time changes as small as 500 nanoseconds.
    • Bat performance correlates with the half-wave rectified cross-correlation of sonar signals and echoes.
    • Perception of sound phase/periodicity is crucial.

    Conclusions:

    • Bat echolocation processing is highly sensitive to temporal variations in echoes.
    • The nervous system likely uses time-domain and periodicity information for acoustic imaging.
    • This study highlights sophisticated temporal processing in bat sonar.

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