Stroop Effect and Interference

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Stroop Effect and Interference Florida Atlantic University Abstract One hundred and six undergraduate students in a class room setting participated in the numerical Stroop effect first originated by J.Ridley Stroop hypothesized that interference in incongruent stimuli would produce longer reaction times than those of congruent, reading and counting conditions. We replicated the Windes 1968 experiment when using numerosity because his study suggests that the response is slowed down due to how the participant processes the information. We expected to find a longer reaction time from participants when presented with the incongruent stimuli. Numerical identity and numerosity were conflicting. The incongruent stimulus was numerical value and numerosity where processing took longer in the condition. Participants were asked to read aloud four lists (a congruent, reading, counting, and incongruent) and be recorded in time how fast they could complete each task. The independent variables in our research included congruency of content and counting while the dependent variables were the reaction times. The results suggested that indeed the longer reaction times were that of the incongruent condition. This suggests that due to numerosity and numeral values speed of processing is slowed down. The original Stroop Experiment has paved the way for identifying the interference effect. Researcher approaches has given interference an area of vast acceptance in experimental literature (Stroop, 1935). Studies of the effect of interference have suggested that Stroop had “hit upon the idea of a compound stimulus where the word was incongruent with the ink color. His two major questions”(MacLeod,1991) were what effect each dimension of the compound stimulus would have on trying to name the other dimension, and what effect practice would have on the observed interference”(p 318).
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