Abstract
Echolocating bats (Eptesicus fuscus) were trained to discriminate between identical targets located at different distances from the bat. By means of a simultaneous discrimination procedure, the threshold for detection of differences in target range was determined. At an over-all range of 30 cm, the minimum detectable difference between the nearer and farther targets was 11 mm. The bats were blinded, and they emitted characteristic echolocation cries throughout the discrimination process. Three cues are available to the bats for detecting the difference in target range: the apparent size difference between the targets, the longer travel time for the echo from the farther target than for the nearer target, and the instantaneous frequency differences between the returning FM echoes slightly offset in time. Concurrent experiments indicate that Eptesicus probably measures target range by echo time delay.
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