Why do people have language centers?

Language center is unique to human cerebral cortex, mostly located on the left side. Clinical practice has proved that the language area of right-handed people (right-handed people) is in the left hemisphere, and the language center of most left-handed people is also in the left hemisphere, and only a few are in the right hemisphere. The hemisphere where the language area is located is called the dominant hemisphere. In childhood, if the left hemisphere is damaged before the dominant hemisphere is established, it is possible to re-establish the dominance in the cortex of the right hemisphere, thus restoring the language function. The language center is responsible for controlling human beings to carry out advanced activities such as thinking and consciousness, and to express language. Classification and function of language center: Motor language center (speech center): located in areas 44 and 45, near the lower part of the anterior central gyrus and 1/3 behind the inferior frontal gyrus, also known as broca area. Ability to analyze and synthesize language-related muscle stimuli. It's damaged here. Although the patient's muscles related to pronunciation are not paralyzed, they lose the ability to speak, which is clinically called motor aphasia. Auditory Language Center: Located in Area 22, behind the superior temporal gyrus, it can adjust its own language and understand other people's languages. It is damaged here, and the patient can speak, but it is disorganized and fragmented; Being able to hear others speak, but unable to understand the meaning of the speech, and often answering irrelevant questions, is clinically called sensory aphasia. Visual motor language center (writing center): located at the back of middle frontal gyrus, it is damaged here. Although other motor functions are still preserved, fine movements such as writing and painting are hindered, which is clinically called agraphia. Visual language center (reading center, also known as Wernicke's area): 3 is located in areas 9 and 37, in the inferior corner of the parietal lobe, close to the visual center. When this center is damaged, the patient's vision is barrier-free, but the original literate people become unable to read and lose their understanding of words and symbols, which is called alexia. & lt/SPAN>。 & lt/p & gt；