Studies have shown that human facial expressions are basically determined by genes and have little to do with culture. It is difficult to tell whether a person's facial expression is a real expression or a deliberate behavior.
The same expression can have different meanings. Smiling can be a sign of happiness, friendliness and sometimes even an apology. The specific meaning of an expression depends to a great extent on the communicative situation and the habitual characteristics of the communicator.
Facial expression refers to the reaction of various parts of the head (mainly the face) to emotional experience. It is the easiest to match the content of the speech, so it is used much more frequently than gestures. Darwin pointed out in the book "Expressions of Man and Animals" that the expressions and actions of modern people are all inherited by human ancestors, so the initial expressions of human beings are all human. This kind of humanity makes expression one of the few means of communication that can transcend culture and region in today's social activities.
Laughter and deadpan are the core of facial expressions, and any other facial expressions occur between the poles. Other facial expressions between these two poles are embodied in two kinds of emotional activities: pleasure (such as love, happiness, happiness, excitement, excitement) and unhappiness (such as anger, fear, courage, pain, rejection, contempt and surprise). When you are happy, your facial muscles are horizontal, your eyebrows are blowing, your pupils are dilated, your mouth is upturned and your face is short. The so-called "eyebrows and beards are laughing"; When you are unhappy, your facial muscles stretch vertically and your face is long, which is called "pulling like a horse's face" A expressionless face, looking straight, almost motionless. A deadpan face is the most suffocating. It hides all the feelings and makes people unpredictable. In fact, it often conveys the message of rejection more deeply than explicit anger or disgust.
Smile, sincere smile is a social pass. It tells the other party that there is no hostility and can further express welcome and friendship. Therefore, a smile, like a spring breeze, makes people feel warm, cordial and happy, and it can bring a harmonious and peaceful atmosphere to the conversation.
Common facial expressions have the following meanings: nodding to show agreement, shaking one's head to show negation, raising one's head to show pride, bowing one's head to show submission, bowing one's head to show disappointment, biting one's lips to show firmness, pouting to show contempt, opening one's nose to show anger, expressing happiness to people, gnashing one's teeth to show anger, flying one's eyes to show pride, and being stunned to show surprise.