Interesting things happen when two sides of the brain duke it out.

Question: What do mistakes reveal about human nature?

Dan Gilbert: Well mistakes almost always reveal something interesting about the system that makes them. When I was a kid I was fascinated by optical illusions. I would sit in my father’s study – I had this book of optical illusions – and just stare and state at the lines that you could just put your fingers down and you’d realize they’re equal lengths; but you took your fingers up and, “My gosh! They look like one’s longer than the other!” How does that happen? How can I believe something that at one level I know is absolutely wrong? I think this is a metaphor for a lot of what’s interesting in psychology. Our tendency to believe, but to not believe. One part of our brain says it’s right. Another part of our brain says it’s wrong. Mistakes that we make almost always reveal the war between these two parts of our brain. The war between what’s rational and what’s irrational inside our heads.

Recorded on: 6/12/07