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J Neurophysiol 77: 1029-1033, 1997;
0022-3077/97 $5.00
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The Journal of Neurophysiology Vol. 77 No. 2 February 1997, pp. 1029-1033
Copyright ©1997 The American Physiological Society

RAPID COMMUNICATION


Signaling of Object Approach by the DCMD Neuron of the Locust

F. Claire Rind and Peter J. Simmons

Department of Neurobiology, Newcastle University, Newcastle Upon Tyne NE2 4HH, United Kingdom

Rind, F. Claire and Peter J. Simmons. Signaling of object approach by the DCMD neuron of the locust. J. Neurophysiol. 77: 1029-1033, 1997. The locust descending contralateral motion detector (DCMD) responds to movements anywhere within a wide visual field, but responds most strongly to the images of approaching objects. It has been claimed that the response peaks before the end of an approach movement, providing a signal that anticipates collision. However, we find that when the locust eye is presented with appropriate computer-generated images of approaching objects, the response builds up until after movement has stopped. Premature peaking in the response is due to failure to stimulate the eye with sufficiently small and frequent jumps in image edges. We conclude that the DCMD signals impending collision by tracking edge motion throughout object approach.




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