Abstract
Previous studies have raised the question of the validity of using only hospitalized Ss as controls when the results are generalized to a non-hospitalized population. Twelve male hospitalized Ss and 12 male non-hospitalized Ss participated in a reaction time study using the visual and auditory modalities under constant 6-, 9-, and 15-sec. foreperiod conditions. The data showed significant differences between groups in all foreperiods with the auditory stimuli and the 15-sec. foreperiod with the visual stimulus. Results are discussed in terms of the use of hospitalized patients as controls in research and the differential effect of foreperiod and modality on the two groups studied.
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