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Journal of Experimental Biology 104,203-215 (1983)
Published by Company of Biologists 1983

Suppression of a Locust Visual Interneurone (DCMD) During Defensive Kicking

W.J. HEITLER 1

1 The Gatty Marine Laboratory, University of St Andrews, St Andrews, Fife, Scotland KYI 6 8LB

1. Visual stimuli presented to a locust during performance of a defensive kick fail to elicit a response from the descending contralateral movement detector (DCMD) visual interneurone. Similar control stimuli presented before the initial flexion and at least 1s after the movement elicit a normal DCMD response (10-15 spikes).

2. External stimuli used to elicit defensive kicking can sometimes cause suppression of the DCMD without the occurrence of kicking, but only when there is an increase in central nervous activity, or associated behavioural response.

3. Proprioceptive stimulation similar to that occurring in a kick does not cause suppression of the DCMD unless there is an increase in central nervous activity or associated behavioural response.

4. Extensive dorsal dissection abolishes the suppression of the DCMD.

Key words: Locust, DCMD, kicking

Submitted on October 11, 1982
Accepted on November 23, 1982






© The Company of Biologists Ltd 1983