This article applies to:
Experiment Author: Susan Campbell. Adapted from STEP and used with permission of Brian MacWhinney
This is the classic experiment where participants are presented with words printed in colors that do not match the colors of the words (for instance, the word "red" might be printed in green ink). They are then expected to name the color of the word rather than the word itself (in the above example, saying "green").
In this experiment there are four variations to the Stroop task. The order of the variants is random. There are two sets of instructions. Both sets of instructions present tasks with different types of stimuli.
1. "Read the name of the color and ignore other information." One set of trials presents "@@@@@" In different colors. The other set of trials mixes colors with the names of colors and participants repeat the written name of the color
2. "Name the color of the item displayed, ignoring other information." One set of trials using this instruction only uses the color black and participants only repeat the name of the color. Another set of trials mixes colors and the names of colors. Participants repeat only color displayed and ignore the written name of the color.
This experiment has 80 trials. Each type of task has 20 trials.
Stroop, J.R. (1935). Studies of interference in serial verbal reactions. Journal of Experimental Psychology, 28, 643-662. (See PDF document below).
Works Cited by the Experiment
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BROWN, WARNER, Habit interference in card sorting. Univ. of Calif. Studies in Psychol., 1914, V. i, No. 4.
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PEARCE, BENNIE D., A note on the interference of visual habits in the white rat. J. Animal Behav., 1917, 7, 169-177.
PETERSON, J., and BARLOW, M. C., The effects of practice on individual differences. The 27th Year Book of Nat. Soc. Study of Educ., Part II, 1928, 211-230.
PETERSON, J., LANIER, L. H., and WALKER, H. M., Comparisons of white and negro children. J. Comp. Psychol., 1925, 5, 271-283.
PETERSON, J., and DAVID, Q. J., The psychology of handling men in the army. Minneapolis, Minn. Perine Book Co., 1918, pp. 146.
SHEPARD, J. F., and FOGELSONGER, H. M., Association and inhibition. Psychol. Rev., 1913, 20, 291-311.
TELFORD, C. W., Differences in responses to colors and their names. J. Genet. Psychol., 1930, 37, 151-159.
WOODWORTH, R. S., and WELLS, F. L., Association tests. Psychol. Rev. Monog. Suppl., 1911, 13 (No. 57), pp. 85.
STEP: Bilingual Stroop 
STEP: Animal Stroop Task 
STEP: Response and Encoding Factors in "Ignoring" Irrelevant Information 
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