Abstract
As compared “visual stream segregation (VISS)”, found by Bregman and Achim (1973), with β movement between two stimuli, the followings were clarified: Korte's fourth law and the IST law of Kahneman for β movement with two-stimulus configuration are appliciable to VISS with four-stimulus configuration, too. As far as this goes, therefore, VISS is functionally equivalent to β movement, and in form, it is regarded as a compound phenomenon consisted of two β movements. But the value and the range of SOA, necessary for the optimal movement in VISS, are smaller and narrower than those of β movement between two stimuli. Moreover, as for configurations, the vertical stimulus pattern tends to increase the occurrence probability of VISS than the other stimulus patterns. Thus we can suggest the effect of the configurational property of stimulus on VISS. The orientation of movement, however, regulated by order of stimulus presentation, does not have any effect on the goodness of VISS.
