Abstract
Horizontal saccadic eye movements were recorded when a spot target moves in a sequence of steps, designed to manipulate the variables of spatial and temporal predictability. This allowed a comparison of anticipatory saccades with saccades elicited by visual stimulation, and evidence is presented which suggests that these categories are discrete and exclusive. Anticipatory saccades were produced both when the target position was predetermined and when it was not, but only in the former case was there also a systematic effect of temporal predictability. Spatial predictability and temporal predictability both reduced latencies for visually elicited saccades, and no interaction was found. The results are interpreted in terms of a model where the timing of a saccade is controlled by a separate mechanism from that controlling the amplitude.
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