Compared with people, their ears account for a larger proportion of their heads and their positions are higher. This helps them protect themselves from natural enemies. In the process of evolution, human beings rely on developed brains to gradually climb to the top of the food chain.
So the function of the ear gradually weakened, and the muscles around the ear began to shrink. At present, most people can't control their ear twitching, and a few people still have this "skill" because of genetic reasons, but "moving ears" is innate and it is difficult to practice the day after tomorrow.
This is a normal physiological phenomenon, and it is harmless. For example, in the TV series "Prime Minister Liu", Liu Yong, the prime minister of the Qing Dynasty, played by Li Baotian, can also control the twitching of his ears.
Extended data:
Among the physiological and pathological relationships between the ear and the viscera, the theory that the kidney opens the ear, the heart opens the ear, the spleen controls the ascending and nourishing the ear, and the qi of the liver and gallbladder affects the ear has been paid the most attention by doctors in past dynasties.
The frequency range that normal human ears can hear is 20Hz to 20000Hz. If the sound frequency of the same intensity is different, people will feel different loudness The most sensitive frequency for human ears to hear sound is 100 to 800Hz.
People's Network-Why do some people's ears move?
Baidu encyclopedia-ear (hearing organ)