Abstract
This study examined the brain potentials associated with fixation pauses following saccadic eye movements during a target detection task. A random number (0-9) was presented at one of the three horizontal positions in random order on a CRT every 780 ms. Eight students were instructed to move their eyes to each stimulus and to detect a target number (10 %). EEGs and EOGs were recorded. EEGs time-locked to the onset of fixation pauses were averaged. The lambda potential with peak latency of about 100 ms appeared predominantly at the occiput, but it showed no definite difference between the target and non-target. In contrast, the parietal dominant positivity peaking at about 400 ms appeared to the fixations at the targets. The positive component was considered as P3 which had been reported in studies of ERPs. The results indicated that endogenous potentials were elicited by fixation pauses in the natural eye movement situation.
