Using a random presentation of inter-stimulus intervals between stimulus 1 and stimulus 2 in a psychological refractory period paradigm, this experiment permitted comparison of data obtained earlier using a block presentation. With 10 male Ss per study, response time to stimulus 1 increased at higher inter-stimulus intervals under block presentations but not under random presentations. The results are interpreted to support time-sharing between the processing mechanisms of the two stimuli rather than a single channel theory.
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