The Pinocchio Effect: nose changes when you lie
Walt Disney may have been right: when a person lies, they experience an increase in temperature around the nose and in the orbital muscle in the inner corner of the eye. This temperature change is known as the "Pinocchio effect," named after the famous cartoon in which the lead character's nose grows when lying.
Though the concept for the character was purely fictional, new research from the University Of Granada Department Of Experimental Psychology has found that the face rises in temperature when experiencing anxiety or when performing considerable mental effort. The researchers used body temperature imaging techniques to track how a person reacts to telling a lie. A part of the brain's reward system (the insula) is activated when real feelings are experienced, relating body temperature. The study found a strong negative correlation between this part of the brain and body temperature – the less active in the insule, the higher the body temperature.