Cochleotopic Organization of the Mustache Bat’s Inferior Colliculus
In recent years considerable attention has been given to the neural correlates of echolocation in bats (Busnel and Fish, 1980). Favorite subjects for these studies have been the mustache bat, a New World species studied by American investigators, and the horseshoe bat, an Old World bat used by European scientists. Both of these bats are of particular interest because of their extraordinarily good frequency discrimination, coupled with one of the most highly specialized auditory systems of any known animal. An appreciation of these animals is best gained by first considering some of their behavioral characteristics. Both the mustache and horseshoe bats belong to a nontaxonomic group called the long CF/FM bats, a name deriving from the types of echolocation signals that they emit. The most prominent feature of the calls is a long constant frequency (CF) component, a tone burst in effect, followed by a less conspicuous, brief frequency modulated (FM) portion (Schnitzler and Henson, 1980). A point of importance is that the pattern of pulse emission has a highly dynamic quality. Most species of long CF/FM bats that have been studied compensate for Doppler-shifts in the echo CF component (Schnitzler and Henson, 1980; Suga and O’Neill, 1980; Henson et al., 1980). Doppler-shifts occur whenever there is a difference in flight speed between the bat and its target.
KeywordsAuditory Cortex Inferior Colliculus Good Frequency Echolocation Signal Peripheral Auditory System
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