1989 年 7 巻 1 号 p. 53-58
The purpose of this study is to examine the effects of saccade direction upon saccade-related brain potentials (SRPs). Eight college students performed visual tracking tasks, in which an Arabic figure was presented at every 740ms on either one of three positions (center, 8 deg. to right in visual angle, and 8 deg. to left) in random order. While right directed saccades elicited more negative potentials than did left directed ones in both small and large saccades in 5 out of 8 subjects, other 3 subjects showed the opposit effects. In all subjects, however, the right directed saccades elicited more negative SRPs at O1 than at O2. And SRPs elicited by the left saccades were more negative at O2 than at O1. Since the negative shifts started at the onset of saccade and sustained afterwards, they were assumed to be caused by an eye ball potential.