Red-, green-, and blue-colored paper stimuli were used to investigate the positive/negative emotions caused by looking at these colors in relation to the simultaneously recorded brain activity. The left lateral activity on electroencephalography (EEG), mental task performance, and the evaluation of color preference by the eight adult subjects were used as indexes. The results showed greater left lateral activity in the alpha band during the closed-eye resting period right after the subjects looked at red compared to the corresponding blue and green conditions. A significant positive correlation was revealed between the color preference evaluations and the left lateral activities, and a significant negative correlation was observed between the color preference evaluations and the activity at occipital regions during the closed-eye resting period.
