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In a noisy world, how can the senses project and receive information at the same time?

were composed of many summed, small-amplitude potentials that occurred at a rate of about 230 Hz. The PADs and the IPSPs started during the closing wing movement and peaked in amplitude during the subsequent opening wing movement. As a consequence, during silent stridulation, the ON1 response to acoustic stimuli was maximally inhibited during wing opening. Inhibition coincides with the time when ON1 would otherwise be most strongly excited by self-generated sounds in a sonorously stridulating cricket. The PADs and the IPSPs persisted in fictively stridulating crickets whose ventral nerve cord had been isolated from muscles and sense organs.

Conclusions
The findings demonstrate that the corollary discharge inhibition during the chirps will prevent desensitization in ON1 and allow the cricket to hear quieter, subsequent sounds in the chirp intervals. In a group of stridulating male G. bimaculatus, where individuals are spaced apart by two meters on average, the ability to hear during singing will be an advantage. It would allow males to defend their territory from rival singing males, to maintain a fixed distance from each other, and to hear noisy predators

This strongly suggests that the inhibition of the auditory pathway is the result of a corollary discharge from the stridulation motor network. Hyperpolarizing current injection into ON1 while it was responding to a 100 dB SPL sound pulse mimicked the central inhibition. This suppressed its spiking response to the acoustic stimulus and maintained its response to subsequent, quieter stimuli. The corollary discharge therefore prevents auditory desensitization in stridulating crickets and allows the animals to respond to external acoustic signals during the production of calling song.


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Contact: Donna Krupa
djkrupa1@aol.com
703-527-7357
American Physiological Society
2-Apr-2003


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