Yue Guanghui

Event-related potentials measurement of perception to 3D motion in depth

An approach to the direct measure of stereoscopic (3D) videos with different accelerations was presented, using electroencephalography (EEG). In the study, subjects viewed 1-sec-long video clips with a stone approaching straightforward and were required to perceive whether they were able to catch the outline of stone. Peak amplitude of each part was extracted from PO3 electrode located at the occipital region corresponding visual processing and cognition. Three components were conspicuously observed in the periods: 650-800 ms, 800-900 ms and 1150-1250 ms, which were called N310, N480 and N810 in this paper. N310 related to the perception to the initial stage of movement. Movement indepth could be immediately perceived when initial speed was not less than 3 m/s. N480 related to the perception to acceleration/deceleration. N810 related to the perception to the point a movement was about to vanish. Subjects couldn’t perceive the outline with the final speed more than 3 m/s. For 3 m/s, subjects were in a dilemma to judge with the detecting rate 54%. Together, component analysis combined with behavioral results, it was supposed that 3 m/s to be the threshold to completely perceive the outline.