Chicago ? The earlier deaf children get cochlear implants, the more likely they are to speak and comprehend language normally later in life, new research suggests. In fact, some doctors say doing the surgery in infancy may produce the best results.

In one study, children ages 12 months to 3 years showed rapid improvement in understanding speech during the first year after receiving one of the electronic devices, with the best results in the youngest children.

In another study, 43 percent of children who got implants at age 2 had normal oral language abilities at ages 8 to 9, compared with just 16 percent of youngsters who got implants at age 4, University of Texas Southwestern Medical School researcher Ann Geers found.

Geers said the longer implant use by the youngest children studied did not explain her results. Instead, she and other researchers say that very early childhood is an especially critical period in the development of language skills, during which children hear and imitate sounds around them.

Both studies appear in May’s Archives of Otolaryngology-Head & Neck Surgery, released Monday. This month’s issue focuses entirely on cochlear implants in children. The studies are among the few to examine the use of the implants in children so young.

Cochlear implants, typically implanted in one ear, use electrodes to transmit sounds to the auditory nerve and brain, bypassing nonfunctioning parts of the ear. The electronic devices are approved for use in children as young as 12 months, but some doctors have begun implanting them in even younger children.

“Babies spend quite a bit of time hearing and experiencing all kinds of sounds and speech in order to learn to talk,” said Dr. Nancy Young, an ear specialist at Chicago’s Children’s Memorial Hospital. “It certainly makes sense to think that giving children the opportunity to hear as soon as possible would be beneficial.”

About three out of every 1,000 U.S. infants are born deaf. Deafness and hearing problems also can occur after birth from ailments including meningitis. Many such children are candidates for cochlear implants, as are some adults with age-related hearing loss.

Dr. Michael M.E. Johns, Archives editor, said tremendous advances had been made in dealing with hearing loss in children over the past decade, with better implant technology and improved hearing tests.

Newborn hearing tests, now performed in most states, mean most children born deaf are diagnosed shortly after birth. In the early 1990s, children born deaf were typically identified after age 3, Johns said.

An estimated 23,000 people nationwide have the implants, including some 10,000 children. The devices do not restore normal hearing, and users usually work with specialists to improve their communication skills. Many wear hearing aids in the non-implant ear; some also use sign language.