Stroop test online: Color Clash
A quick Stroop test: tap the color of the ink, not the color the word names.
Try a practice roundPlay today’s fiveHow it works
A color word appears in a different color of ink. Tap the button for the ink color, not the word. Five rounds, and a wrong button, or a tap too quick to have looked, costs 0.8 s.
What it measures
This is the Stroop effect, first described by John Ridley Stroop in 1935. Reading is so automatic that the word interferes when you are asked for the ink color.
It is a classic measure of cognitive control: overriding a habit to give the answer the task actually wants.
What’s a good score?
In Reactdle, 950 ms or faster rates Sharp, up to 1.4 s is Steady, and slower is Sluggish.
Tips
- Look at the color as a patch, not a word; slightly unfocused eyes help.
- Don’t rush: a wrong button costs far more than a careful one.
About Reactdle
Color Clash is one of twenty tests in Reactdle, a free daily reaction game. Every day everyone gets the same five tests, one from each kind: reflex, aim, brain, timing and words.