Name the ink colour, no the wird. It soonds easy till the wird says yin colour an the ink shaws anither. Aboot a meenit, free, nae sign-up.
Bi the Helibrain teamChecked bi Robert(Inglis), PhD candidate in biophysicsPit oot Last checked
Whit this test measures
It measures hou weel ye can answer the task in front o ye while ettlin tae ignore a strang habit: readin. In 1935, John Ridley Stroop fand that fowk took muckle langer tae name the ink colours o clashin colour wirds (the wird "red" printed in blue, for ensample) than tae name plain patches o colour 1. That slowdown is cried the Stroop effect, an it's yin o the maist studied fyndins in psychology 2.
Researchers uise the Stroop task tae study selective attention an the control o automatic responses 2.
Hou the test works
- Yin wird appears at a time (red, green, blue, yellow), printed in yin o the same colours. Answer the ink colour wi the buttons or the keyboard.
- 4 practice wirds wi feedback come first, then 40 countit wirds. In 50% o them the wird matches its ink; in the lave it disna.
- If ye dinna answer within 3 seconds, the wird counts as a miss. Leavin the page ends the run, cause the test is timed.
Hou tae read yer score
- Time cost o mismatched wirds: yer average time on mismatched wirds minus yer average on matchin wirds, richt answers alane. This is yer Stroop effect. Smaller means the wird got in yer road less.
- Answered richt: the share o aw countit wirds ye answered richt. Ganger faster uisually costs accuracy, sae keek at baith nummers thegither.
This version shawes yin wird at a time an ye answer wi buttons, like maist computer versions. Stroop's ain version uised printed cairds read oot loud, sae the nummers canna be compared wi his.
Afore ye stert
Gin ye hae trouble tellin some o thae colours apairt, for ensample red an green, this test canna measure ye fairly. Yer device's colour settins, nicht mode or a dark-mode filter can chynge hou the colours luik an aa. Practisin the task can chynge yer nummers an aa, sae compare wi yer ain earlier runs.
For anither test o stoppin an automatic response, gie the Gaun-or-no-gaun test a try.
Related tests
- Gaun-or-no-gaun testWhether ye can stap yersel fae tappin in time.
- Road-drawin testHou fast ye join circles in order, an switch atween nummers an letters.
- Reaction-time testHou fast ye react whan a signal appears.
Want tae wark on this ilka day? The Helibrain app (in Inglis for noo) has a free plan an paid plans.
Cite this page: Stroop Test. Helibrain. 2026. https://helibrain.com/sco/stroop-test. CC BY 4.0.
Common questions
How this test works
This test shows how well you can ignore a strong habit: reading. A colour word such as RED appears in coloured ink, and you answer the colour of the ink, not the word. After 4 practice words you answer 40 words. In half of them the word and the ink match; in the other half they don't. You have 3 seconds for each word. Your main score is how much slower you are on mismatched words. This effect was first described in 1935.
Version 1 · Cite this test:
Helibrain (2026). Stroop test, v1. https://helibrain.com/stroop-test/methods
Soorces
How we made this page: scrieved bi the Helibrain team fae the studies listed abuin, an checked bi Robert(Inglis) (PhD candidate in biophysics) on 11/3/2026. We update it when the soorces chynges.