There are also clinical cases that show the flip side of this coin.
Humans can tell lies with their faces. Although some are specifically trained to detect lies from facial expressions, the average person is often misled into believing false and manipulated facial emotions. One reason for this is that we are “two-faced.”
By this I mean that we have two different neural systems that manipulate our facial muscles. ( ① )
One neural system is under voluntary control and the other works under involuntary control. ( ② )
There are reported cases of individuals who have damaged the neural system that controls voluntary expressions. ( ③ )
They still have facial expressions, but are incapable of producing deceitful ones. ( ④ )
The emotion that you see is the emotion they are feeling, since they have lost the needed voluntary control to produce false facial expressions. ( ⑤ )
These people have injured the system that controls their involuntary expressions, so that the only changes in their demeanor you will see are actually willed expressions. * demeanor: 태도, 표정