Inhibition · Control
Stroop Test
A colour word is painted in an ink that may not match. Answer the ink, ignore the word.
No IQ score. No cognitive age. No percentile we can’t source.
Inhibition · Control
Stroop
A colour word is painted in an ink that may not match. Answer the ink, ignore the word.
Your best · — correct
Measures interference control in this task — how much a mismatched word slows you.
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Free to play here. On Train, part of Core.
What this measures
Stroop measures interference control in this task: how much a mismatched colour word slows you down, and how often you answer with the word instead of the ink. Reading is automatic, so a word that fights its ink is a small cost you have to override on every mismatched trial — the gap between the matched and mismatched trials is that cost, in milliseconds. It is a reading of selective attention on this screen. Because the cost is a difference of two noisy medians, it swings from run to run; read it as a wide band, and notice that a constant lag from your device cancels inside it.
Play forty for your interference cost, survive the shrinking-window gauntlet, or sprint the clock, then challenge a friend.
How to get better
You mostly get better at this task — settling into the four zones, keeping your eyes on the ink and not letting the word pull you. That’s a real, honest thing to practise, and it’s why accuracy and the median matter more than one fast call. It makes you better at overriding a reading response on a screen.
Questions
- What is the Stroop effect?
- When a colour word is printed in a different ink — the word RED shown in blue — naming the ink takes longer than when they match, because reading the word is automatic and you have to override it. That extra time is the interference cost, and it is the whole point of this task.
- What does this test measure?
- Interference control in this task: how much a mismatched word slows you down, and how often you answer with the word instead of the ink. It is a reading of selective attention on this screen.
- Why does my interference cost jump around between runs?
- Because it is a difference of two noisy numbers — your median on the matched trials subtracted from your median on the mismatched ones — and a difference of two noisy things is noisier than either. Read it as a wide band, not a precise score. A constant lag from your device cancels inside that gap, which is why the cost is the honest number to watch, not your raw speed.
- I can't easily tell the four colours apart — can I still play?
- The task itself is naming colours, so it does need you to separate the four hues. Every response zone also spells out the colour's name and a key letter beside the swatch, so the colour is never the only cue. If telling the hues apart is hard, a spatial version — a word shown above or below a line — measures the same kind of interference without colour.
- What are the three modes?
- Quick test is a balanced 40-trial run, half of them mismatched, that gives you your correct calls, accuracy and interference cost. Endless is an escalating gauntlet where the response window shrinks each level and one wrong call, miss or jumped gun ends the run. The 45-second sprint counts how many clean calls you can land while building a combo.