EFFECTS ON REACTION TIME TO A PRIMARY COLORED STIMULUS AS A FUNCTION OF HUE OF A SECOND FOLLOWING STIMULUS.
AMERICAN INSTITUTES FOR RESEARCH SILVER SPRING MD
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An investigation of the effects on RT to a primary stimulus S1 by a secondary stimulus S2 was conducted using heterchromatic stimulation red-green and green-red as compared to unichromatic stimulation red-red and green-green. Eight volunteer Ss were employed in the study. Following two practice sessions to insure that stable levels of performance had been reached, a counterbalanced arrangement of stimulus presentation was used in both the heterochromatic and unichromatic sessions. Nine double stimulus trials were given consisting of nine interstimulus intervals from 0 to 200 msec. The trials, plus a single stimulus trial, were all presented randomly in blocks of 10 trials. The Ss task was to respond to the first stimulus that appeared. It was hypothesized that 1 The inhibitory effect will depend on the temporal relationships between S1 and S2. 2 Greater inhibitory effects will result under heterochromatic stimulation than under unichromatic stimulation. 3 If S1 is green and S2 is red, RT inhibition will be greater than if S1 is red and S2 is green. All of the above hypotheses were supported by the data of the study. The findings were discussed in terms of the resulting facilitation, inhibition and response variability as they related to theoretical concepts that might explain these effects. Author
- Human Factors Engineering and Man Machine Systems