Evidence of preliminary response preparation from a divided attention task

In a divided attention situation, preliminary response activations produced by stimuli on one chan-nel were revealed through their effects on responses to stimuli on a secondary probe channel. Sub-jects performed concurrent but independent four-choice reaction-time tasks using the same four response fingers (middle and index fingers on both hands). In the main task, targets were large and small Ss and Ts, and medium-sized & and 7s sometimes appeared as distractors. Targets in the probe task were squares differing in location. A response to a probe square was faster if a distractor letter presented just before it had the same name as the target letter corresponding to that square (i.e., assigned to the same response key) than if the distractor letter had a different name—a result indicating that distractor letters cause partial response preparation. The timecourse of the effect demonstrated that preparation was based on preliminary information about distractor name that was available before distractor size had been determined. The results support models in which re-sponse preparation can sometimes begin before stimulus recognition has finished. Recently there has been considerable interest in distinguish-ing between discrete and continuous models of human informa-tion processing (e.g., Meyer, Yantis, Osman, & Smith, 1984