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Evaluating Some Possible

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Running head: EVALUATING SOME POSSIBLE

Evaluating some possible Causes of the Stroop Effect
Matt Sheehan, M.S.
Carolyn Rude-Parkins, Ph.D.
University of Louisville
November, 2007

Introduction The words blue, green, and yellow are words known to all as colors. If one of these color words is written in an ink color differing from the color it represents an individual spends more time to name that ink color than the ink color of neutral words. This is known as the Stroop effect. Studying this gives insight into the human mind. It can show how we handle interference across a number of different situations or how our automatic processes interact with and affect our controlled processes. The cause of the Stroop effect has been widely debated and researched over the years. Some researchers believe the cause is due to the fact that reading is such a well learned or even over learned process that it becomes automatic. When asked to identify ink colors of words reading the word causes distraction because reading is done much more often than naming ink colors. But where is the exact interference occurring in this process and why? It has been suggested that the interference occurs at the output or response stage as an individual struggles to express the correct color word from alternatives. Others believe the interference happens during encoding as an individual analyzes the word and is distracted from ink color. Still others would say it happens somewhere between the encoding and the output. All of these suggestions have various criticisms. The search for the correct answer to this phenomenon continues.

Literature Review In an attempt to determine where the interference was taking place, Naish (1985) designed two experiments, the first to see if the interference occurred earlier than the output stage and the second to see if it was taking place in the output stage. In the first experiment the participants were shown a cue word, such as blue, then were shown either the same word, a different word but in the same color ink as the cue word, the same word in the same ink color, or a different word in different ink. They were required to answer, “Yes” if the word or ink color matched the cue or “No” if it did not. The fastest answers were given when the word and ink matched the cue. Slower responses were produced on both of the alternative yes responses. Yes to ink color match was the slower of the two displaying the normal Stroop effect. The “No” answers were faster when the word and ink color were congruent but still differed from the cue. Naish concluded that interference at the output stage was unlikely because interactions between word, ink color, and the cue word are taking place before output is required. Naish did not assume that interference before output is the only possible form of interference taking place. The second experiment by (Naish) was constructed to implicate the output stage as containing the interference. Four color words and four neutral words were used. The participants were required to either name the word or the color it was printed in. The color words produced slower response times than the neutral words. According to the presentation of stimulus the interference seems to take place at the output stage. The slower response times for the Stroop stimuli seem to point out problems in articulating the appropriate response for what is being asked. Naish concluded that while interference could be occurring at multiple sites it was more likely that the interference was taking place between the analysis of the stimuli and the response. He believes that conceptual coding may be the cause. His findings support that the closer the two stimuli are conceptually the slower the response times will be. Deciphering between the ink colors a word is printed in and the actual word itself takes longer when the word is also a color. Besner, Stolz, & Boutilier used two experiments in 1997 to investigate the automatic reading hypothesis. The first experiment used four color words and four pseudo homophones; these were word such as blue, and yellow. On half of the trials the entire word was colored and on the other half only a single letter was colored. If the Stroop effect is due to the distraction of automatically reading the word when presented then the effect should be similar for all trials. However, it was not. The single letter colored words and also the pseudo homophones yielded a smaller Stroop effect than did the regular color words with all letters colored. The second experiment was the same except the pseudo homophones and also the congruent trials were removed. Four neutral words were used instead. These neutral words had the same first two letters as the color words. This experiment produced similar results as the first. The single letter colored produced the smallest Stroop effect. Once again it has been shown that the Stroop effect can be reduced and that automatic reading can be put aside by manipulation (Besner, Stolz, & Boutilier 1997). Both studies discussed above show that a Stroop effect is taking place. Besner, Stolz, and Boutilier reduced the Stroop effect in their experiments with a manipulation of the reading response. Naish’s experiments displayed an obvious Stroop effect (1985) and attempted to discover the cause. Based on these studies it can be expected that there will be a Stroop effect in the present study. However, if reading is automatic the Stroop effect should be reduced or removed when the color words are turned upside down.

Discussion

Description of current data

The data show the stimuli that required the longest response time were the right side up conflicting color words. The right side up conflicting color words had a mean response time of 30.05 seconds. The Xs had the shortest response time with a mean of 26.95 seconds. Upside down conflicting color words produced a response time similar to the right side up conflicting color words. The mean response time for the upside down conflicting color words was 29.23 seconds. Even with the color words presented upside down there was still obvious interference. The data display the normal Stroop effect.

Comparison of Study Results All studies found that the largest Stroop effect was produced when incongruent color words were used with all letters colored. Besner, Stolz, and Boutilier (1997) found evidence suggesting the automatic reading hypothesis to be overestimated. The present data produced a very similar response time for right side up and upside down conflicting color words. The results of these studies appear to be at odds with each other. If Besner, Stolz, and Boutilier were correct, the upside down conflicting color words and the Xs should have similar response times.

Inferences Made From the Current Data

It seems possible that the upside down color words might stand out to a participant more if the right side up color words were seen before attempting that trial. This could account for the similar response times. So placing the upside down color words as the first trial might reduce distraction and Stroop effect by making them less evident to the participant. However, even reading the upside down conflicting color words first rather than second or third still did not reduce the Stroop effect. It appears that a participant still attempting to process the upside down word is causing interference. This could be due to the fact that these color words are so common that they are recognizable no matter how they are positioned. The findings seem to agree with the conclusions of Naish (1997) concerning why the interference is taking place. The right side up and upside down conflicting color words produced similar response times. Both are conceptually close to the response being requested, the ink color. The upside down color word is still able to be processed and cause interference. Somewhere between the analysis and the response the word, whether right side up or upside down, and ink color became confused with one another resulting in longer response times. This is not occurring with the Xs.

References

Besner, D., Stolz, J.A., & Boutilier, C. (1997). The Stroop Effect And The Myth Of

Automaticity. Psychonomic Bulletin & Review, 4, 221-225.

Naish, P.L. (1985). The locus of the Stroop effect: One site masquerading as two? British

Journal of Psychology, 76, 303-310

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