Problems with the centers of language development may result in symptoms such as aphasia, dysgraphia, dyslexia, and sensory aphasia, which are related to the site of cortical damage. 1. Motor aphasia: The motor speech center, located in the posterior part of the inferior frontal gyrus. Patients with damage to this area lose the ability to speak, but can understand other people’s language. The muscles related to pronunciation are not paralyzed, so they can still pronounce words. 2. Dysgraphia: The writing center, located in the posterior part of the middle frontal gyrus, is close to the precentral gyrus, which manages the motor area of the upper limb muscles and hand muscles. Patients with damage to this center lose the ability to write and draw, but other motor functions are not affected. 3. Dyslexia: The visual language center (also known as the reading center) is located in the parietal angular gyrus. Patients with damage to this center have no visual impairment, but they are unable to read because they cannot read the words they already know or understand the meaning of sentences. 4. Sensory aphasia: the auditory language center, located in the posterior part of the superior temporal gyrus and the posterior part of the middle temporal gyrus. Patients with damage to this center have no hearing impairment and can speak, but they cannot understand the meaning of other people’s speeches, and so they cannot answer questions correctly. It is recommended that the patient should go to the hospital in time to get a clear picture of the location and nature of the lesion and then standardize the treatment in time, so as to avoid delaying the condition.