1. Wason and Johnson-Laird (1972)
Confirmation Bias
The Wason Card Problem
Wason and Johnson-Laird (1972)

2. Confirmation Bias
Each card has a number on one side and a letter on the other.
You can turn over 1 or 2 cards.
Which card / cards would you turn over to prove the following statement false?
“If a card has a vowel on one side, it has an even number on the other”.
Solution

3. Confirmation Bias
“If a card has a vowel on one side, it has an even number on the other”.
The only card combination that can be used to prove this statement false is
A + 7

4. Confirmation Bias ShortCutstv The Wason Card problem Wason and
Johnson-Laird (1972)
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