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Wisconsin Card Sorting Test
How Flexible Is Your Mind?

The Wisconsin Card Sorting Test (WCST) measures cognitive flexibility and set-shifting—your ability to deduce hidden rules and adapt when they change without warning.

How It Works:

  • You'll see four reference cards at the top
  • Match each new card to one of the four reference cards
  • You will NOT be told the sorting rule - you must figure it out!
  • Cards can be sorted by COLOR, SHAPE, or NUMBER
  • You'll only get feedback: “Correct” or “Incorrect”
  • Warning: The rule will change without notice after you master it!
▲
1 Red Triangle
★★
2 Green Stars
✚✚✚
3 Yellow Crosses
●●●●
4 Blue Circles

⚠️ The Challenge:

This test measures cognitive inertia—your tendency to get “stuck” on old strategies. The ambiguity is intentional! The real test begins when you think you've mastered the rule, but your brain must flexibly shift to find a new one.

Scientific Background: Based on the classic 1948 Grant & Berg Wisconsin Card Sorting Test. This test is famous for its sensitivity to frontal lobe function and executive control. Your perseverative errors (continuing to use an old rule after it changes) are the most important measure of cognitive flexibility.