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Echo Particle Image Velocimetry

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Published on: December 27, 2012

Echo interval and not echo intensity drives bat flight behavior in structured corridors.

Michaela Warnecke¹, Silvio Macías², Benjamin Falk²

¹Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, USA warnecke@jhu.edu.

The Journal of Experimental Biology

|October 26, 2018

Summary

This summary is machine-generated.

Bats navigate by echolocation, using sound echoes to perceive their environment. This study found bats prefer corridors with spaced-out echoes over intense ones, suggesting echo timing influences flight path selection.

Keywords:

Acoustic flow Auditory-evoked activity Echolocation Eptesicus fuscus Inferior colliculus

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Area of Science:

Animal behavior
Neuroethology
Sensory processing

Background:

Animals adapt locomotion based on environmental stimuli.
Echolocating bats use auditory processing of echo returns for navigation.
Echo flow patterns influence bat navigation, but acoustic basis is unclear.

Purpose of the Study:

Investigate the acoustic basis for echolocating bat flight path selection.
Determine if echo intensity or spacing influences navigation.
Explore neural processing of echo cascades in the inferior colliculus.

Main Methods:

Bats were released in a flight corridor with adjustable pole spacing and echo strength.
Bat trajectories were recorded and analyzed.
Auditory evoked responses in the inferior colliculus were measured using echo playback.

Main Results:

Bats deviated toward corridor walls with more sparsely spaced, highly reflective poles.
Flight path was not affected by echo intensity.
Neural responses showed discrete modulation by temporally distinct echoes from sparse poles.

Conclusions:

Pole spacing, not echo intensity, influences bat flight path selection.
The bat's temporal resolution of echo cascades may drive flight behavior.
Findings suggest a link between neural processing of echo timing and navigation.