What does Mona Lisa's smile mean? Thank you, and God bless you.

Mona Lisa's mysterious smile is a mystery in the world art world, attracting and confusing visitors from generation to generation. It is said that millions of people visit the famous painting Mona Lisa in the Louvre in France every year. Napoleon used his power to hang the oil painting Mona Lisa in his bedroom, enjoying it alone every morning and evening, and sometimes standing in front of the painting for a day and a half, fascinated; The late French President Charles de Gaulle went to the Louvre to enjoy paintings when he encountered thorny problems or was upset. When he came out of the Mona Lisa exhibition hall, all his original troubles disappeared. In response to Mona Lisa's smile, many visitors and critics have written many articles to guess the mysterious expression of Mona Lisa. Different people feel different, and describe Mona Lisa's smile as beautiful, vicious, sarcastic and facial askew. Freud also arbitrarily believes that Mona Lisa's smile truly reflects Leonardo da Vinci's memory of his mother's smile from a psychological point of view. From 65438 to 0989, Adu thought that Mona Lisa's smile might be the expression of facial muscle contracture caused by Fahrenheit degeneration and regeneration of facial nerve after Bell's facial paralysis, which was called Mona Lisa syndrome. According to historical records of art, Leonardo da Vinci's creation of Mona Lisa began in 1503 and was completed in 1506 when Mona Lisa was 30 years old on her 26th birthday. Prior to this, 1495, 18-year-old Mona Lisa married Francisco del Giocondo and became his third wife. She got pregnant after marriage and gave birth to a daughter, but unfortunately her daughter passed away on 1499. This incident shows that Mona Lisa was pregnant before Leonardo da Vinci wrote Mona Lisa, and pregnancy will greatly increase the possibility of Bell's facial paralysis. According to clinical research, the probability of pregnant women suffering from Bell's palsy is 3.3 times that of non-pregnant women. If we carefully observe the Mona Lisa's face, we will find that the distance between the left eyelid and the right eyelid is short, and the left squabble is higher than the right squabble, which may be the performance of contracture of the middle face and orbicularis oculi muscle. 1970, Ruskin also noticed that not only the Mona Lisa's eyes are different, but also the upper lip angles on both sides are different, with one side slightly upturned and the other side not. From a medical point of view, facial paralysis caused by various reasons, such as Bell's palsy, Ramsey-Hunter syndrome, trauma and so on. , may return to normal function. But once the facial nerve is denervated, the recovery of facial function will be delayed. Nerve regeneration usually begins at 6- 12 weeks after facial paralysis, and the sequelae also begin at this time. After facial paralysis 16 weeks, the sequela became permanent. The most common sequelae of facial paralysis are contracture and synkinesis, which often occur at the same time. Contraction is characterized by deepening nasolabial groove (shortening and improving upper lip). At rest, the mouth and lips are symmetrical. Although facial movements have not fully recovered, people still think that facial paralysis has been satisfactorily recovered. The word "contracture" is actually wrong. In fact, it is not that the involved muscle fibers are shortened, but that spastic paralysis occurs because the nerves are damaged to varying degrees. Facial muscle contracture rarely occurs in frontal muscle, because the upper part of facial nerve nucleus which dominates forehead is dominated by inhibitory fibers from two hemispheres, so it is unlikely to lose its inhibitory control. Contraction is at rest, while joint movement is mainly in motion, which is caused by the wrong direction of regenerated nerve fibers or the "short circuit" of nerve trunk. When contracture and syndesmosis occur, both voluntary and involuntary muscles of the affected side will be involved. Facial movement occurs when muscles contract in voluntary and involuntary movements. When speaking, the voluntary movement of the perioral muscles is accompanied by involuntary blinking movement of the perioral muscles. On the contrary, when you blink, you will be accompanied by muscle spasm. When the forehead is raised, you will be forced to close your eyes, or an exaggerated involuntary smile will make the contracture more obvious and present a strange face. Therefore, children with such sequelae should learn not to laugh as much as possible. As early as 1909, some scholars suggested that patients with contracture and joint movement should be cultivated into "expressionless faces". Trying to retrain facial muscles may aggravate the range of motion of facial muscles and increase the linkage of the affected muscles. Therefore, it is necessary to train patients to limit the activities of the affected side and cultivate a "expressionless face". In this way, the muscle movement of the normal side will also be limited, and eventually the two sides will tend to be symmetrical. At the end of facial muscle recovery, the muscles of the affected side may be overstretched, which eventually leads to static overcorrection. Contraction and band movement are directly related to the severity of nerve injury and muscle denervation. Patients with complete denervation may have severe contracture and band movement, while patients with partial denervation may have contracture and band movement proportional to the degree of denervation. Mona Lisa may have moderate denervation. If the facial nerve is injured, cut off or anesthetized again, contracture (spastic paralysis) will turn into flaccid paralysis, and the joints can't move. Based on the above artistic and medical facts, we can speculate on Mona Lisa's mysterious smile as follows. Leonardo da Vinci, a talented anatomist and artist, spent four years, but he didn't really "finish" the painting of the Mona Lisa. The possible reason is that the Mona Lisa blinks when her forehead moves upward, and the nasolabial groove deepens, which can't be shown in a still portrait (linkage movement). This can also explain why Leonardo da Vinci adopted the painting technique of friendship dye, which can make the portrait look unpredictable. Moreover, through this painting technique, the internal structure of Mona Lisa's face can soften the rough lines caused by contracture. Leonardo da Vinci was both interested and frustrated by Mona Lisa's changing nasolabial groove position and eye crack width. In order to strengthen the anatomical defects, he specially invited actors to sing, perform, tell jokes or do funny things for Mona Lisa to make her happy. In this way, Leonardo da Vinci, who was well trained in anatomy, could capture the Mona Lisa's instantaneous smile. Unfortunately, Mona Lisa has learned to control her smile and developed a cold face. When leonardo da vinci was frustrated because he couldn't accurately capture the dynamic changes of belt movement, he spent hours drawing beautiful scenery as the background of his portrait, a technique that he had never heard of at that time. Up to now, it is impossible to know whether Leonardo da Vinci intends to describe his heroine Mona Lisa as such a mysterious facial expression. If we can find the answer in Da Vinci's legacy, all the problems will be solved. Nevertheless, the argument of Mona Lisa syndrome put forward here is based on facts, not just speculation. Leonardo da vinci is an anatomist and an artist. Only he can combine art and science perfectly. BEIJING, May 20 (Xinhua)-The Independent 19 reported that in the past 500 years, Leonardo da Vinci's Portrait of Mona Lisa has fascinated countless art lovers, but it has also puzzled scholars. Recently, an American scientist claimed to have found the smiling Mona Lisa in The Secret Behind. When Leonardo da Vinci painted the Mona Lisa's mouth, he used the technique of blurring the outline, which literally means "evaporate like smoke" in the original Italian text. Livingstone, a neurobiologist at Harvard University in the United States, believes that this is not just a simple fuzzy technique. Leonardo da Vinci also tried to "deceive" human vision when painting, so that the viewer can clearly see Mona Lisa's smile from the side. Livingstone put forward this theory in his new book Vision and Art: The Biology of Appreciation. She said in the book: The smile drawn in a vague way is more obvious in the peripheral vision, so when you concentrate on her mouth, the smile will disappear, just like when we look at the dim stars, the stars will disappear directly. However, some scholars criticize that scientists who claim to have solved the secret behind the Mona Lisa are just trying to attract the media.