[Research on activity evolution of cerebral cortex and hearing rehabilitation of congenitally deaf children after cochlear implant]

Objective:There is a significant difference in the hearing rehabilitation between the congenitally deaf children after cochlear implant(CI). The intrinsic mechanism that affects the hearing rehabilitation in patients was discussed from the perspective of evoked EEG source activity.Method:Firstly, we collected the ERP data from 23 patients and 10 control group children during 0, 3, 6, 9 and 12 months after CI. According to the hearing rehabilitation during 12 months after CI, the patients were divided into two groups: rehabilitation of "the good" and "the poor". Then we used sLORETA to show the changes in the groups of patients' cerebral cortex and compared with the control group.Result:Cross-modal reorganization of cerebral cortex exists in the congenitally deaf children. The cross-modal reorganization gradually degraded and the activity of the relevant cortex followed by normally after CI. There was a statistically significant difference(P < 0.05) in the temporal lobe and the associated cortex around parietal lobe between "the good" and "the poor" groups after 12 months.Conclusion:The normalization of the cross-modal reorganization in patients reflects the hearing rehabilitation after CI, especially the normalization of the activity of the temporal lobe and the associated cortex around parietal lobe, which influences the rehabilitation effect of the auditory function to some extent. This research demonstrated the detection of the mechanism has important significance for the hearing recovery training and evaluation of the hearing rehabilitation after CI.