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The Journal of Neuroscience, May 15, 2000, 20(10):3814-3821

Wind Direction Coding in the Cockroach Escape Response: Winner Does Not Take All

Rafael Levi and Jeffrey M. Camhi

Department of Cell and Animal Biology, Life Sciences Institute, Hebrew University, Jerusalem, Israel 91904

Cockroaches respond to the approach of a predator by turning away and then running. Three bilateral pairs of giant interneurons are involved in determining the direction of the sensory stimulus and setting the turn direction. Each of these six interneurons has a different directional response to wind stimuli. We have tested whether these six cells use a winner-take-all mechanism to perform this directional determination: that is, each of these cells suppressing the motor response that each of the other cells promotes. Such a mechanism is found in similar behaviors of some other animals. By adding spikes to identified giant interneurons through intracellular stimulation during the sensory-induced behavior and analyzing the resulting directional leg movements, we find that a winner-take-all is not used in this system. Rather, directional determination appears to be based on collaborative calculation of direction by the giant interneurons as a group.

Key words: escape behavior; electrical stimulation; interneurons; giant interneurons; cockroach; winner-take-all; directional behavior; neural code

Copyright © 2000 Society for Neuroscience  0270-6474/00/20103814-08$05.00/0




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