Abstract
The prior study suggested that compatibility effect was reduced when proportion congruency (PC) was low than when it was high, using a stimulus-response paradigm. The purpose of this study was to investigate whether PC effect depends on stimuli or interaction between different contexts, using Simon task. We used two types of triangle stimuli. One of these was varied stimuli which PC was 75% or 25% in a given block. Another was constant stimuli which PC was 50% in a given block. Participants were asked to identify a triangle with vertical or horizontal stripes which was presented left or right visual field. PC effect was observed not only in the varied stimuli but also in the constant stimuli. These suggested that PC effect may depend on the interaction between different contexts rather than on each stimulus.
