Study on relationship between positive potential after Go-Cue and movement's decision-making in saccade by EEG

Abstract

Our study focus on the saccadic eye movements to elucidate movement's decision-making mechanism in human. In previous study, the posterior parietal cortex has relation to movement's decision-making. Therefore, we analyze EEG signals on P3 and P4 electrodes. We performed the Memory-Guided-Saccade-Task (MGST) as followings. There are three fixation points on a display.Firstly, the Direction-Cue is represented by either a right- or left-arrow on the center fixation for 0.2[sec]. Next, the Go-Cue is represented by the auditory stimulus after 2.5~3.0[sec] at disappearance of the Direction-Cue. And then, the subject gaze at the fixation indicated by the Direction-Cue after presenting the Go-Cue. The Direction-Cue is represented 100 times (each right- and left-arrow 50 times). The auditory stimulus is pure tone of 1000[Hz] and is represented for 0.1[sec]. As results, the difference of positive potentials between the movement and non-movement task is observed after 0.2[sec] at presenting the Direction-Cue