Abstract
The function of the saccadic programming system has been studied using a doublestep target movement in two dimensions. The results of these experiments suggest the following hypotheses. The information processing in the programming of a saccade consists of direction computation and magnitude computation. If the new target-step arrives before the direction computation of the previous saccade is complete, this saccade will be cancelled. The partial program concerning the direction of the saccade is kept in a buffer memory: if the direction of the new saccade is not in a direction similar to the old one, this partial program has to be erased, which takes an extra 40–80 msec of processing time. There is a stage in which the direction of the saccade cannot be reprogrammed but the magnitude can still be reduced. In other words, the magnitude computation seems to finish after the direction computation. If the new target-step arrives after the computation of both direction and magnitude are complete, two full saccades will be observed.
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