Will hearing be restored after a cochlear implant? What other rehabilitative training is required? A cochlear implant, as the name implies, is an artificial organ that replaces a diseased cochlea to perform sound sensing and transmission functions. If the preoperative examination, diagnosis and evaluation are thorough and accurate, and the surgery is successful, the patient’s hearing can be ideally restored. In terms of frequency, a full-frequency natural hearing reconstruction of 70-10000Hz can be achieved; in terms of loudness, a normal hearing reconstruction of 20-30dB can be achieved (i.e., the hearing of extremely severe hearing loss can be improved from 90-110dB to normal hearing of 20-30dB). Human hearing is directly related to sound understanding as well as speech communication, tone recognition and music appreciation. Cochlear implants achieve auditory reconstruction, while sound understanding and language formation and music perception require rehabilitation learning and training after hearing recovery. Prelingual Deafness Since patients have no hearing prior to surgery, most have no basis for language. After cochlear implant surgery to restore hearing, further intensive language learning is required, i.e., language rehabilitation. In general, infants and children operated before the age of 1 year old have an auditory-linguistic developmental process comparable to that of normal hearing children of the same age and do not require special specialized language rehabilitation training. Experienced families can conduct home education (also called home rehabilitation) as normal children do; prelingual deaf children over the age of 1 year old, especially those over 2-3 years old, because The children above 1 year old, especially those above 2-3 years old, have delayed or missed the golden period of language development (the golden period of language development for normal children is from 6 months old to 2 years old), therefore, they need to strengthen their language rehabilitation at home or go to specialized institutions (language training institutions under the Disabled Persons’ Federation or other specialized language training institutions) for intensive language training in order to catch up with the language development level of normal hearing children of the same age as soon as possible. Generally speaking, most deaf children who have had cochlear implants before the age of 2-3 years can reach the speech level of normal hearing children with 6-12 months of professional training. Of course, the older the pre-speech deaf child is, the longer the recovery period, which is directly related to the development of the language center. Post-lingual deafness Because the patient has a certain linguistic foundation and a fair level of native language before surgery, the majority of post-lingual deafness patients do not require special language rehabilitation training. With continuous postoperative hearing-memory self-enhancement exercises, they can basically achieve the desired level of verbal communication. It is worth noting that the hearing-verbal ability of postoperative deaf patients is related to the duration of hearing loss, i.e., the shorter the duration of deafness, the faster the recovery of hearing-verbal ability; the longer the duration of deafness, the longer the recovery of hearing-verbal ability accordingly. In general, after 1-2 years of hearing-memory self-reinforcement exercises, the vast majority of postlinguistic deafness patients can reach their individual best level.