Fig. 5

A Experimental conditions and procedure of human behavioral experiment. In the divided attention condition, participants attended to both RDPs equally, ignoring any directional shift. A color cue was presented after RDPs disappeared, and then, participants reported a direction of the cued RDP by clicking along a white circular outline. In the focused attention condition, a color cue indicated which RDP participants had to attend. Participants were asked to detect a directional shift on the cued RDP if it occurred, and then reported motion directions of this RDP as in the divided attention condition. B Direction judgment was more accurate in the focused attention condition, and when motion speed was faster (n = 14). C Detection of directional shifts (only in the focused attention condition) was not affected by motion speed. However, direction discrimination was more accurate when the attended RDP was red. Error bars indicate SEM. * p < .05, *** p < . 001