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

veness of ON1. Their research consisted of making intracellular recordings of auditory afferents and an identified auditory interneuron the Omega 1 neuron (ON1) during stridulation. The authors of A Corollary Discharge Mechanism Modulates Central Auditory Processing in Singing Crickets, are J.F.A. Poulet and B. Hedwig, from the Department of Zoology, University of Cambridge, Cambridge, United Kingdom. Their findings appear in the March 2003 edition of the Journal of Neurophysiology, one of 14 publications published monthly by the American Physiological Society.

Methodology
All experiments were performed on adult male G. bimaculatus selected from a cricket colony maintained on a 12 hour light/12 hour dark cycle. Prior to dissection they were chilled at 4C for 30 min. They were then fixed in a standing position on a holder that allowed free rotation of the animal. To allow for silent stridulation, the left wing of the crickets was removed. When recording false stridulation, the cricket was placed upside down in a Plasticene well and its ventral cuticle was removed to expose the abdominal and thoracic ganglia. The thoracic or thoracic and abdominal nerves were cut, except for prothoracic nerve #5, which contains the auditory afferents. Care was taken not to damage the main ventral trachea. To deafen crickets, the forelegs were removed just distal to the coxa. Other procedures performed include pharmacological stimulation, acoustic stimulation, as well as recordings on auditory neurons.

Results
During sonorous stridulation, the auditory afferents and ON1 responded with bursts of spikes to the crickets own song. When the crickets were stridulating silently, after one wing had been removed, only a few spikes were recorded in the afferents and ON1. Primary afferent depolarizations (PADs) occurred in the terminals of the auditory afferents, and inhibitory postsynaptic potentials (IPSPs) were apparent in ON1. The PADs and IPSPs
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Contact: Donna Krupa
djkrupa1@aol.com
703-527-7357
American Physiological Society
2-Apr-2003


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