Assiament Facilitate and Significant Interference of stroop effect on psychological refractory period

Dual stimulus task is an appropriate way to investigate humans’ limited capacity of information processing. Thus, this study was aimed to investigate the first stimulus simplification and significant interference on the second reaction time. The participants included 17 male students of Shahid Chamran University whose age average was 23.45±1.54. All of them performed a dual task test within four intervals of 50, 100, 300, 900 ms between asynchronous onset of two stimuli under congruent and incongruent and neutral conditions. The results of ANOVA with repeated measure at the significance level of P˃0.05 indicated that simplification of the first congruent stimulus, compared to incongruent and neutral stimuli; reduces the reaction time for second congruent and neutral stimuli. The required change of attention processes in dual task with second incongruent stimulus causes on significant effect of first congruent and neutral stimulus precedence over second incongruent stimulus. The findings suggest that simultaneous performance of dual tasks with high information processing capacity or divided attention among non-automatized tasks should be avoided. Moreover, for intial of simplification processes and significant interference at leat 100 ms be required.