Your brain is constantly being bombarded with information, so how does it decide what to trust and what to ignore, without you even being aware? Professor Bruce Hood leads us through the second of this year's Christmas Lectures - testing the limits of our memory, finding out how we learn, how our brain takes shortcuts and why multi-tasking can be dangerous. Bruce will make you say the wrong thing and fail to see what's right in front of you. Can you really believe your eyes? Possibly not.