Abstract
The bat Eptesicus fuscus is apparently sensitive to the fine structure of the autocorrelation function of its transmitted pulse. This sensitivity has been interpreted as evidence for phase perception in bats at ultrasonic frequencies. An alternative interpretation of the data, however, does not depend upon phase perception. The observed sensitivity to autocorrelation fine structure can be explained by a process that involves cross correlation of filtered spectrograms. Spectrogram representations are insensitive to a constant phase shift.
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