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An experiment was carried out to study the effect of partial advance information on performance. Reaction time and accuracy measures were compared for three conditions: a six‐choice task, a three‐choice task, and a set of experimental conditions in which a two‐choice task preceded two three‐choice tasks by various durations of time. Tests under all conditions were carried out after varying amounts of practice. It was found that at all stages of practice a difference between performance on the six‐choice task and on the three‐choice task was maintained. As the separation between the two‐choice and three‐choice task was varied from 0.04 sec. to 0.50 sec. in the experimental conditions, performance became increasingly similar to, and finally identical with, that under the control three‐choice condition. The relationship between duration of forewarning and performance was, however, not a simple one. The results are discussed with reference to traditional and current views on information processing.
J. A. Leonard (Thu,) studied this question.