REPETITION EFFECTS WITH CATEGORIZABLE STIMULUS AND RESPONSE SETS

The repetition effect refers to the finding that reaction times are fa ster on trial n when the stimulus presented and/or the response requir ed is the same as on trial n - 1 than when it is different. Five exper iments examined the importance of stimulus features and response featu res in obtaining the repetition effect. Experiment 1 demonstrated a ne ed for the stimuli to be categorically mapped to responses for a respo nse repetition effect to be observed. Experiments 2-5 showed that the repetition effect can be obtained across responding hands when spatial information (Experiments 2 and 4) or finger information (Experiments 2 and 5) is consistent across hands but not when these sources of info rmation are eliminated (Experiment 3). The results are in agreement wi th expectations developed from salient-features coding and with the in clusive links hypothesis proposed by H. Pashler and G. Baylis (1991 a) .