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Science 23 August 1996:
Vol. 273. no. 5278, pp. 1100 - 1103
DOI: 10.1126/science.273.5278.1100
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Reports

Corticofugal Modulation of Time-Domain Processing of Biosonar Information in Bats

Jun Yan and Nobuo Suga

The Jamaican mustached bat has delay-tuned neurons in the inferior colliculus, medial geniculate body, and auditory cortex. The responses of these neurons to an echo are facilitated by a biosonar pulse emitted by the bat when the echo returns with a particular delay from a target located at a particular distance. Electrical stimulation of cortical delay-tuned neurons increases the delay-tuned responses of collicular neurons tuned to the same echo delay as the cortical neurons and decreases those of collicular neurons tuned to different echo delays. Cortical neurons improve information processing in the inferior colliculus by way of the corticocollicular projection.

Department of Biology, Washington University, One Brookings Drive, St. Louis, MO 63130, USA.


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