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Related Concept Videos

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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FM echolocating bats shift frequencies to avoid broadcast-echo ambiguity in clutter.

Shizuko Hiryu1, Mary E Bates, James A Simmons

  • 1Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe 610-0321, Japan. shiryu@mail.doshisha.ac.jp

Proceedings of the National Academy of Sciences of the United States of America
|March 31, 2010
PubMed
Summary

Echolocating bats adjust their sonar frequencies to resolve echo ambiguity in cluttered environments. Bats alter sound frequencies in pairs to distinguish echoes from different obstacles, improving navigation.

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Neuroethology

Background:

  • Bats use sonar (echolocation) for navigation and foraging.
  • Rapid sonar emissions in cluttered environments can cause echo overlap and ambiguity.

Purpose of the Study:

  • To investigate how echolocating bats resolve ambiguity caused by overlapping echoes in cluttered environments.
  • To understand the neural and behavioral mechanisms bats employ to distinguish echoes from successive sonar broadcasts.

Main Methods:

  • Bats emitting multi-harmonic FM sounds were trained to fly through dense obstacle arrays.
  • Bat sonar emissions were recorded using miniature radio microphones.
  • Flight paths were reconstructed using thermal-infrared video.
  • Inter-pulse intervals (IPIs) and frequency shifts were analyzed in relation to echo streams.

Main Results:

  • Bats emitted sounds in strobe groups with short IPIs (20-40 ms), leading to echo overlap and ambiguity.
  • In response to overlap, bats shifted frequencies of the first sound upward and the second sound downward by 3-6 kHz.
  • Frequency shifts ceased when echo overlap and ambiguity were resolved.
  • Harmonic structure of echoes enhanced time-frequency comparisons for echo assignment.

Conclusions:

  • Bats actively adjust sonar frequencies to disambiguate overlapping echoes in cluttered environments.
  • Frequency modulation in sonar signals is a key mechanism for resolving echo ambiguity.
  • This adaptation allows bats to maintain accurate spatial perception and navigation despite challenging acoustic conditions.