The flash light composed of alternative bright and dim phases was used in simple and choice reaction time experiments to investigate the effect of dim-bright ratio (DBR) on signal discrimination.

• 正>问题一般闪光都包括亮与黑两个相互交替的吋相。如果在黑时相不是完全黑,而是仍有一定光亮,我们仍能清楚地看到闪光。