Rule Discovery

Sort cards to one of three reference piles. Discover the hidden rule from feedback — then adapt when it silently changes. Based on Milner's (1963) Wisconsin Card Sorting Test, a classic measure of cognitive flexibility and frontal lobe function.

How to Play

• A test card appears. Sort it to one of 3 reference cards by clicking
• After each sort you get Correct ✓ or Wrong ✗ feedback
• Figure out the hidden sorting rule from the feedback
• After several correct sorts in a row, the rule changes — no warning!
• Rules: match by COLOR, SHAPE, or COUNT (number of symbols)
• Keyboard: press 1 2 3 for the reference cards

Ref 1

●

1 Red Circle

Ref 2

▲▲

2 Green Triangles

Ref 3

■■■

3 Blue Squares

Rule Discovery

How to Play

Select Difficulty

Rule Discovery

How to Play

Select Difficulty