Abstract
Preliminary observations on 5 female desert locusts Schistocerca gregaria (Forskal), revealed particularly vigorous response in the descending contralateral (DCMD) movement detector neurons to black radially expanding (approaching) visual stimuli. Greater responsivity to expanding, rather than contracting targets, and the absolute spatial sensitivity of the locust DCMD system suggested a role for simple lateral inhibitory contrast mechanisms in the function of this class of neuron. The biological significance of this particular neural system was discussed.

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