Abstract: The experiment was conducted to investigate the interaction of regular polygon dispersion, basic side,and signals display condition. The experimental variables were: (a) 5 dispersions of polygons; (b) 5 basic sides of polygons; (c) 2 signal display conditions. The dependent variable was the average response time of each signal. The stimuli materials were 25 regular polygons with different dispersions and different basic sides. The experimental procedure was carried out on a computer, including stimuli presenting and reaction data collecting. The results showed: (a)the polygon dispersion had significant affect on signal cognitive performance (P< 0. 01 ),the polygon signals with middle(about 0. 5)or lower dispersion had higher cognitive performance; (b) the polygon basic side had significant effect on signal cognitive performance(P ＜0. 01), the cognitive performance was inversely related to the number of polygon sides; (c)signal display condition had no significant effect on signal cognitive performance (P＞ 0. 05 ); (d) the interaction of dispersion and basic side had significant effect on signal cognitive performance(P＜0. 05), when the basic sides increased to the point of 8, the cognitive performance of polygons with large dispersion (0. 6, 0. 7) had a significant departure from that with smaller dispersion(0. 3, 0. 4, 0. 5).

Key words: dispersion, basic side, signal display condition, cognitive performance