The contribution of stimulus-response compatibility (SRC) to interference effects was tested in a Stroop-like task. Few previous studies have examined maximal compatibility for both dimensions of a stimulus. In the present study, the words UP, DOWN, LEFT, and RIGHT were presented on a computer screen . The word appeared at fixation and immediately began to move either up or down or left or right. Subjects responded either manually (by moving a joystick) or verbally according to (1) the verbal denotation of the word or (2) the direction the word was moving. Stimuli were congruent (e.g., UP moving up) or incongruent (e.g., UP moving down) and were presented in four conditions that varied in the degree of SRC (e.g., voice response to the meaning of the word = high SRC; voice response to the direction the word was moving = low SRC). Response times were slower in conditions with low SRC. The typical congruency effect was more pronounced in conditions with low SRC than in conditions with high SRC, showing that at least some of the interference observed in Stroop-type studies can be explained in terms of SRC.In the traditional Stroop task, names of colors are written in different colored inks (Stroop, 1935). When subjects are asked to read the word , they encounter little interference from an incongruent ink color, whereas when they are asked to name the ink color , they experience significant interference from an incongruent word (Dyer, 1973;Macleod, 1991).A number of studies have shown that Stroop interference can be significantly reduced by using non-naming responses such as buttonpressing (Flowers & Dutch, 1976;Keele, 1972;Virzi & Egeth, 1985). A possible explanation is that a printed word is "a program for a reader telling him how to pronounce it, but an object is not related to its name except arbitrarily" (Beller, 1975, p. 155). In other words, a nonverbal response is not compatible with a verbal stimulus, and therefore verbal incongruency does not produce interference. Likewise, Treisman and Fearnley (1969) have argued that interference with selective attention or response might arise only when the irrelevant stimulus attribute belongs to the same class as the response . The logical conclusion of this line of reasoning is that interference effects would be severely reduced if it were possible for subjects to generate a " color" response. This is the hypothesis that guides the present research: when there is maximal compatibility between the irrelevant stimulus dimension (cue) and the required re-