The Wason Test

There are four cards, a simple rule, and all you've got to do is to work out which cards you need to turn over to see if the rule has been broken. That's got to be easy, right? Well maybe, but the Wason Selection Task, as it is called, is one of the most oft repeated tests of logical reasoning in the world of experimental psychology. So let's see how you do.

There are three questions to complete, each one associated with a set of four cards. Here's the first question.