The Simon Effect as a Function of Temporal Overlap between Relevant and Irrelevant

The Simon effect refers to an advantage in performance in a reaction time task when stimulus location corresponds to that of its response location even though the location of the stimulus is irrelevant. For example, if red or green color squares are presented randomly to the left or the right side, participants might be instructed to make a left response for the red square and right response for the green square. Reaction time is faster when the red square is presented on the left rather than on the right, and vice versa for the green square.