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The fast phase of optokinetic nystagmus in the locust

ABSTRACT. When their visual environment is rotated about them, freely moving locusts make the typical slow (following) and fast (flick back) phases of optokinetic nystagmus. The fast phase was examined and is compared with that of Crustacea and vertebrates. It is unusual in the locust in that it is symmetrical about the body midline. Mechanoreceptors play a significant role in maintaining the fast phase reset function.