Cochlear implants may restore normal auditory pathways in the brain even after many years of deafness, a University of Lyon study in France found.
The results imply that the brain can reorganize sound processing centers or press into service latent ones based on sound stimulation, according to Jeanne Guiraud and colleagues at the University of Lyon, Edouard Herriot University Hospital in Lyon and Advanced Bionics.
Advanced Bionics worked with deaf subjects from 16 to 74 years old and found that younger subjects and those with a shorter history of deafness showed changes that mirrored patterns in people with normal hearing more closely, according to the study published in Journal of Neuroscience.
Guiraud and her team studied 13 profoundly deaf adults who had received cochlear implants, on average, eight months before the study. Electrical stimulation to the ear allowed the team to locate where in the brain's auditory cortex various frequencies were processed and come up with a map for these tones.
Their results demonstrated that in people who had cochlear implants for at least three months, normal frequency organization was somewhat restored.
Güncelleme Tarihi: 25 Temmuz 2007, 19:25