How to play
The dot holds up colour words printed in the wrong ink. Tap the colour of the ink, not the word it spells. Thirty seconds, as many as you can.
Tap the ink colour · Or keys 1 2 3 4
Free in your browser, with ten levels that get harder. No account; your best scores stay on your device.
What the study found
Stroop found it in 1935, and it is one of the most repeated findings in psychology (MacLeod, Psychological Bulletin, 1991). Reading is so automatic it gets in the way.
J. Ridley Stroop · Journal of Experimental Psychology, 1935
Why it matters
A practised response fires before you decide. Reading is so automatic it beats the instruction you were given. That is why KOZMO asks what people actually do at work, and how often, rather than what they mean to do.
It is for fun: the game does not measure you.
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