Adaptations of the auditory nervous system for echolocation
@article{Grinnell1972AdaptationsOT, title={Adaptations of the auditory nervous system for echolocation}, author={Alan D. Grinnell and Susumu Hagiwara}, journal={Zeitschrift f{\"u}r vergleichende Physiologie}, year={1972}, volume={76}, pages={41-81} }
Summary1.Seven species of paleotropical echolocating bats were studied in an effort to correlate differences in emitted orientation pulses with differences in neural analysis mechanisms. Major emphasis was on species of the genus Hipposideros, which emit extremely high frequencies in pulses consisting of a constant frequency for several msec followed by a fast downward sweep in frequency.2.Evoked potentials and single unit responses were recorded from the posterior colliculi and more peripheral…
50 Citations
Comparative auditory neurophysiology of the inferior colliculus of two molossid bats,molossus ater andmolossus molossus
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- 2004
Data are compared with results from “long CF-FM-bats”, revealing striking species differences in frequency selectivity of single neurons and organization of the ascending auditory pathway, suggesting different strategies in information processing which are discussed as adaptations to the species specific orientation calls.
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Summary1.Electrophysiological properties of auditory units of six species of paleotropical echolocating bats, including two FM bats and four CF-FM bats were studied by recording the responses to tone…
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It is concluded that non-echolocating bats, like other small mammals, lack several of the auditory adaptations considered to be adaptations for echolocation: sharp restriction of sensitivity to the region of emitted sounds, sensitivity at extremely high frequencies, fast temporal resolution, facilitation of responsiveness to the second of a pair of sounds, and sharply directional hearing in front of the bats.
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Electrophysiological properties of the neurons in the superior olivary complex of the bat, Myotis lucifugus, are studied and evidence for the existence of binaural neurons is presented and discussed.
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Inhibition is discussed in terms of improving the neuronal signal/spontaneous noise ratio and altering responsiveness of neurons after stimulation, so that these neurons may be suited to time processing in the acoustic pathway.
Comparative auditory neurophysiology of the inferior colliculus of two molossid bats,molossus ater andmolossus molossus
- BiologyJournal of comparative physiology
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Response patterns of single neurons were found to depend on the frequency-time-course of the stimulus, especially with slowly sweeping FM-signals, neuronal response activity could be greater than to any other stimulus configuration employed.
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The frequency range of the foveal areas with their flutter processing neurons overlaps exactly with the frequency range where DS compensating bats most likely receive echoes from fluttering insects, indicating that auditory fovea and DSC are adaptations for the detection and evaluation of insects flying in clutter.
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Rebound excitation (Off-responses) following non-neural suppression in the cochleas of echolocating bats
- BiologyJournal of comparative physiology
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Auditory nerve evoked potential responses (N1) occur at the termination of tone pips as well as the onset in several species of bats that emit orientation sounds having a constant frequency component of several msec duration, it is concluded that the suppression is unlikely to be mediated by chemical neural inhibition.
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