# Idea The Wason card selection task is a logical puzzle that's often used to demonstrate the difficulty of applying the abstract rule of the form of the [[logical implication|logical implication (p then q)]] to concrete problems. It was introduced by [[Peter Wason]] in 1966. Rule: *If there is a vowel on one side of a card, then there is a an even number on the other side of the card*. Which of these four cards **need** to be turned in order to fully test that the rule applies? $v \rightarrow e$ ![[20231229115143.png]] > [!NOTE]- Answer > E and 7 need to be turned to fully test the rule. > > E: Directly checks the rule by assessing whether the antecedent leads to the consequent. Check if vowel $\rightarrow$ even. If not, rule is violated. > > 7: Check if vowel $\rightarrow$ 7 (not even number). If we see a vowel, we see that vowel on one side does not mean even on the other side, so the rule is violated. > > K: Irrelevant card. The rule says nothing about consonants. If we see an even number on the other side, it tells us nothing about $v \rightarrow e$. Same if we see an odd number on the other side. So no matter whether we see an odd or even number, the rule is affirmed or cannot be falsified. > > 4: Irrelevant card. If we see a consonant like B, then consonant $\rightarrow$ even, and the rule is not violated. If we see a vowel like A, then $v \rightarrow e$ is affirmed. So no matter whether we see consonant or vowel, the rule is affirmed. > See GPT's [[Wason four-card selection task GPT explanation using truth table|explanation that uses a truth table]]. # References