Three years ago I listened to a lecture on cognition that changed the way I think about intelligence. This is the crux. There are two types of cognition. The first is normal cognition. This is the ability to retrieve knowledge from memory. When you are asked a question on a test and produce an answer, that’s a display of cognitive ability. The second type of cognition is metacognition; the ability to know whether or not you know. Read the full article here.