StroopLab

3 blocks · 48 trials · about 4 minutes

The panel tells you the rule. Can you keep up?

Every trial is one colour word printed in some colour. What you have to do with it depends entirely on the panel behind it - and in the last block, that panel changes under you from one trial to the next.

No sign-up. Your answers are tied to this browser by a cookie, nothing else.

RED

Black panel → read the word

RED

Grey panel → name the colour

Same word, same ink, opposite answers. On black the answer is RED. On grey it is BLUE. Reading is automatic, so the grey rule is the one that fights back.

What the suite runs

Every block is generated fresh for you - the colours, the words, the panels and their order are all random. The first two blocks hold one rule steady so each can be measured cleanly. The third mixes them, with nothing but the panel to tell you which rule is live.

  1. One rule14 trials

    1. Black panel - read the word

    The colour is trying to distract you.

  2. One rule14 trials

    2. Grey panel - name the colour

    Now the word is trying to distract you.

  3. Rule switching20 trials

    3. Panel changes - follow the rule

    Both rules, and only the panel tells you which.

What you get for free

  • Your overall score out of 100 and the band it falls in.
  • How many trials you got right.

The full report - AUD 3.00

  • What going past the word to the colour costs you, in milliseconds.
  • What changing rule mid-flow costs you on top of that.
  • Charts of where you stand against published reaction-time data.
  • A PDF emailed to you, plus HTML, CSV and JSON downloads.
Read how the scoring works first