Figure 1.

Prime stimuli used in the experiment. Black dots represent the original position of each prime at the center of the screen. Gray circles represent motion positions of the dot(s). For the case of a right moving single dot, all possible dot positions are depicted. The last gray circle on the left or right represents the end position of the motion for left or right movements. Each step lasted one refresh cycle (i.e., 13.33 ms). Note that the scale for the single-dot motion type and the scale for the row-of-dots motion type differ. (a) Single-dot motion primes and (b) row-of-dots motion primes.