Perception of time is an extremely interesting area. One of my favourites was the cutaneous rabbit experiments (http://en.wikipedia.org/wiki/Cutaneous_rabbit_il

Perception of time is an extremely interesting area. One of my favourites was the cutaneous rabbit experiments (http://en.wikipedia.org/wiki/Cutaneous_rabbit_illusion http://en.wikipedia.org/wiki/Cutaneous_rabbit_illusion), where researchers tap the arms of a blindfolded subject. They tap several times on the wrist, then several times on the elbow, but the sensation is of a sequence of taps leading up the forearm. What's interesting is that the taps perceived as occurring in the mid-forearm occur before the elbow is tapped. Your brain goes back and alters previous memories based on subsequent events, without your awareness. There is an intuitive sense that the memories you have of a particular time happened at that time, but research shows that's not always the case.