The Stroop Effect on the Internet

The classic Stroop color and word test was converted to a Web administered version and tested against a conventional computerized version. In a first experiment 20 male and 20 female participants were tested individually on both Stroop versions in random order. They both yielded a strong Stroop effect, but the response time was slower when using the Web-Stroop. A second experiment with 28 participants proved that the results can be generalized to an uncontrolled milieu, such as at a participant’s own home. This suggests that administration of the Stroop color-naming task, and response time measurement in milliseconds on a client computer, is possible via the Internet.