Thereâ€™s a cool test on BBCâ€™s website that measures your ability to know when someoneâ€™s smile is genuine.Â To take the test, click here.
Here’s a hint. The secret is watching the eyes.
Hereâ€™s the debriefing given by the websiteÂ on how to tell the difference between a real and a fake smile.
Although fake smiles often look very similar to genuine smiles, they are actually slightly different, because they are brought about by different muscles, which are controlled by different parts of the brain.
Fake smiles can be performed at will, because the brain signals that create them come from the conscious part of the brain and prompt the zygomaticus major muscles in the cheeks to contract. These are the muscles that pull the corners of the mouth outwards.
Genuine smiles, on the other hand, are generated by the unconscious brain, so are automatic. When people feel pleasure, signals pass through the part of the brain that processes emotion. As well as making the mouth muscles move, the muscles that raise the cheeks – Â the orbicularis oculi and the pars orbitalis – also contract, making the eyes crease up, and the eyebrows dip slightly.