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J Neurophysiol (January 7, 2004). doi:10.1152/jn.01127.2003
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01127.2003v1
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Submitted on November 21, 2003
Accepted on December 29, 2003

Ambiguities in sound duration selectivity by neurons in the inferior colliculus of the bat Molossus molossus from Cuba

Emanuel C. Mora1* and Manfred Koessl2

1 Faculty ofBiology, Department of Animal and Human Biology, University of Havana, Havana, Cuba
2 Zoological Institute, University of Frankfurt, Frankfurt, Germany

* To whom correspondence should be addressed. E-mail: emanuel_mora{at}yahoo.com.

This study examines duration selectivity in auditory neurons of the inferior colliculus of the bat Molossus molossus (Molossidae, Chiroptera) from Cuba. Three main types of duration selectivity, short-pass, band-pass, and long-pass, as previously described in other species, are present in M. molossus. The range of best durations in the inferior colliculus of this species approximates the durations of their echolocation calls, suggesting that, as has been shown in other species of bats and frogs, the filter mechanism that produces duration tuning is selective for species-specific sounds relevant to behavior. Duration coding in M. molossus is not unambiguous, since approximately 30% of the short-pass and band-pass neurons respond best to two different stimulus durations. This bimodal duration selectivity could be explained by time delayed excitatory inputs that coincide with an inhibitory rebound. In addition, the effect of stimulus intensity on duration selectivity was tested. For most of the neurons (78%), duration selectivity was affected by absolute sound pressure level and/or small changes of sound pressure. In this respect the processing of stimulus duration by collicular neurons seems to be more complex in M. molossus than in other species studied so far.




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