Influences of target existence and subject´s intention upon saccadic peak velocity under alternate gaze-shift conditions

In the dark, the subjects repeatedly and alternately made saccades between the two horizontally arranged visual targets or their corresponding remembered targets. Moreover, the intention while the subjects made gaze-shifts between the two points was changed by instruction, i.e., accurately or quickly. The results suggested the following matters. 1. The peak velocity of the saccades elicited toward the visual targets is larger than toward the remembered targets. 2. The peak velocity of saccade increases when the subjects intend to make gaze-shifts as quickly as possible rather than when they intend to make saccades accurately