Stroop Effect
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 that is
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.