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---- ---- The Stroop effect is the finding that naming the color of the first set of words is easier and quicker than the second. In psychology, the Stroop effect is a demonstration of interference in the reaction time of a task. When the name of a color (e.g., "blue", "green", or "red") is printed in a color not denoted by the name (e.g., the word "red" printed in blue ink instead of red ink), naming the color of the word takes longer and is more prone to errors than when the color of the ink matches the name of the color. The effect is named after John Ridley Stroop, who first published the effect in English in 1935. The effect had previously been published in Germany in 1929. The original paper has been one of the most cited papers in the history of experimental psychology, leading to more than 701 replications.〔 The effect has been used to create a psychological test (Stroop test) that is widely used in clinical practice and investigation. == Original experiment == ''Stimulus 1:'' Purple Brown Red Blue Green ----''Stimulus 2'': Brown ---- ''Stimulus 3:'' ---- Examples of the three stimuli and colors used for each of the activities of the original Stroop article.〔 The effect was named after John Ridley Stroop, who published the effect in English in 1935 in an article entitled "Studies of interference in serial verbal reactions" that includes three different experiments.〔 However, the effect was first published in 1929 in Germany, and its roots can be followed back to works of James McKeen Cattell and Wilhelm Maximilian Wundt in the nineteenth century.〔〔〔 In his experiments, Stroop administered several variations of the same test for which three different kinds of stimuli were created. In the first one, names of colors appeared in black ink. In the second, names of colors appeared in a different ink than the color named. Finally in the third one, there were squares of a given color.〔 In the first experiment, 1 and 2 were used (see first figure). The task required the participants to read the written color names of the words independently of the color of the ink (for example, they would have to read "purple" no matter what the color of its ink was). In the second experiment, stimulus 2 and 3 were used, and participants were required to say the color of the letters independently of the written word with the second kind of stimulus and also name the color of the dot squares. If the word "purple" was written in red, they would have to say "red", but not "purple"; when the squares were shown, the participant would have to say its color. Stroop, in the third experiment, tested his participants at different stages of practice at the tasks and stimulus used in the first and second experiments, to account for the effects of association.〔 Stroop noted that participants took much longer to complete the color reading in the second task than they had taken to name the colors of the squares in Experiment 2. This delay had not appeared in the first experiment. Such interference was explained by the automation of reading, where the mind automatically determines the semantic meaning of the word (it reads the word "red" and thinks of the color "red"), and then must intentionally check itself and identify instead the color of the word (the ink is a color other than red), a process that is not automated.〔 Unlike researchers performing the Stroop test that is most commonly used in psychological evaluation, J.R Stroop never compares the time used for reading black words and the time needed for naming colors that conflicted with the written word. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stroop effect」の詳細全文を読む スポンサード リンク
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