How hard is it really to tell a real smile from a fake one?

On the BBK web site, you can take a quiz to check your skills of perception when it comes to checking facial expression honesty.

You might be surprised how many you'll miss. How can you tell if a smile is real or fake? What do you look for?

• This experiment is designed to test whether you can spot the difference between a fake smile and a real one
• It has 20 questions and should take you 10 minutes
• It is based on research by Professor Paul Ekman, a psychologist at the University of California
• Each video clip will take approximately 15 seconds to load on a 56k modem and you can only play each smile once

My score: 16 out of 20.

You?

Take the "Spot the Fake Smile" quiz here.