Accession Number : AD0654513

Title :   EFFECTS ON REACTION TIME TO A PRIMARY COLORED STIMULUS AS A FUNCTION OF HUE OF A SECOND FOLLOWING STIMULUS.

Descriptive Note : Technical rept.,

Corporate Author : AMERICAN INSTITUTES FOR RESEARCH SILVER SPRING MD

Personal Author(s) : Zavala,Albert

Report Date : JUL 1966

Pagination or Media Count : 72

Abstract : 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 S's 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)

Descriptors :   (*COLOR VISION, REACTION(PSYCHOLOGY)), REFLEXES, STIMULATION(PHYSIOLOGY), PERFORMANCE(HUMAN), INHIBITION, PERFORMANCE(HUMAN), PSYCHOPHYSIOLOGY

Subject Categories : Psychology
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE