Can someone who became deaf after learning language understand speech following a cochlear implant?

Post-lingual deaf patients generally can understand speech after receiving a cochlear implant.

In clinical practice, hearing loss can be specifically categorized into pre-lingual and post-lingual deafness based on the degree of speech and language development. Pre-lingual deafness mostly occurs in infants and young children who develop bilateral sensorineural hearing loss shortly after birth. Post-lingual deafness refers to hearing loss that occurs after a person has already acquired speech. This type of hearing loss may result from congenital conditions, head trauma, or factors such as common colds leading to hearing deterioration. After receiving a cochlear implant, post-lingual deaf patients generally can understand speech because they were already able to speak and had normal auditory responses prior to the onset of deafness. However, since the sound perceived through a cochlear implant may differ somewhat from natural hearing, an incremental adaptation process is required. With training and practice, most patients can eventually understand spoken language and engage in normal conversations.

A cochlear implant is an electronic device designed to restore and reconstruct hearing. It converts sound signals into electrical signals, which directly stimulate the patient's auditory nerve fibers, thereby helping restore hearing function.