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- W2893520510 abstract "Echolocating bats measure target distance by the time delay between call and echo. Target movement such as the flutter of insect wings induces delay modulations. Perception of delay modulations has been studied extensively in bats, but only concerning how well bats discriminate flutter frequencies, never with regard to flutter magnitude. We used an auditory virtual reality approach to generate changes in echo delay that were independent of call repetition rate, mimicking fluttering insect wings. We show that in the frequency-modulating (FM) bat Phyllostomus discolor, the sensitivity for modulations in echo delay depends on the rate of the modulation, with bats being most sensitive at modulation rates below 20 Hz and above 50 Hz. The very short duration of their calls compels FM bats to evaluate slow modulations (< about 100 Hz) across entire echo sequences. This makes them susceptible to interference between their own call repetition rate and the modulation rate. We propose that this phenomenon constitutes an echo-acoustic wagon-wheel effect. We further demonstrate how at high modulation rates, flutter sensitivity could be rescued by using spectral and temporal cues introduced by Doppler distortions. Thus, Doppler distortions may play a crucial role in flutter sensitivity in the hundreds of FM species worldwide." @default.
- W2893520510 created "2018-10-05" @default.
- W2893520510 creator A5000824075 @default.
- W2893520510 creator A5010723848 @default.
- W2893520510 date "2018-09-22" @default.
- W2893520510 modified "2023-10-16" @default.
- W2893520510 title "Flutter sensitivity in FM bats. Part I: delay modulation" @default.
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- W2893520510 doi "https://doi.org/10.1007/s00359-018-1291-z" @default.
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