A comprehensive computational model of animal biosonar signal processing
Fig 2
Time-frequency adaptability of FM bat biosonar sounds.
FM pulses recorded from a big brown bat performing in psychophysical tests of virtual echo delay discrimination with electronically-generated echoes [38]. Increasing levels of wideband noise (X axis) were added to the echoes, which induced the bat to increase the duration of its broadcasts from 1–2 ms with no noise (far left) to 6–7 ms in intense noise (far right). Performance in the task nevertheless remained the same in terms of percentage error responses showing that echo reception and delay perception adapt to changing duration of signals.