Ramla Ismail* and Ranjith R

MERF Institute of Speech and Hearing, Chennai, India

*Corresponding Author: Ramla Ismail, MERF Institute of Speech and Hearing, Chennai, India.

Received: August 10, 2022; Published: October 14, 2022

Abstract

Introduction: The individuals deprived of auditory input can compensate with superior specific abilities in the remaining sensory modalities, in children with short or longer duration of deafness. Auditory cortex can be recruited by other modalities especially visual or tactile function. When subjects receive a new sensory stimulation from Cochlear Implant, the cortex undergoes re-reorganization. Visual evoked potential (VEP) is an electrophysiological measure that can be used to measure the visual -auditory reorganization in the hearing-impaired population.

Aim: To investigate the extend of cross-modal plasticity in children with CI and to profile the morphology of VEP in subjects with varying duration of deafness followed by Cochlear Implantation.

Method: Forty-five children with Cochlear Implant between the age range of four to ten years of age. All subjects received Cochlear Implant, with minimum duration of implantation 0-1 year. Stimulus used was checkerboard pattern reversal, recorded using Allengers Scorpio EMG EO NCS system. Latency of P100 and amplitude of P100 was recorded from Oz, Cz, T5 and T6 was analyzed and compared in the implant age group, and in group with increasing duration of deafness.

Result: In this study, there was a change in the amplitude and latency of P100 across the subjects, grouped based on the implant age, the changes were observed in all the recording sites across the groups. The amplitude of P100 was more reduced as the implant age increases, when the data was re-analyzed with respect to the duration of deafness, the amplitude of P100 decreased as the duration of deafness increased. The P2 component was not observed.

Conclusion: The finding suggests the visual processing skills tend to improve as a consequence of electrical input to the auditory cortex via cochlear implant in subjects with longer duration of deafness, as a result of long- term alteration of auditory experience. After implantation, as the auditory cortex of a congenitally deafened individual not only responds for the auditory stimuli, but also for the visual stimuli. In subjects with longer deprivation of hearing the cross-modal changes of the deaf auditory cortex might hinder its recruitment by the cochlear implant input, if this cortical structure has been functionally re- organized by the spared sensory modalities. As a consequence of this phenomenon, input from the cochlear implant may hinder in the perception of visual cues for speech reading skills of the subject.

Keywords: Plasticity; Visual Evoked Potentials (VEP);<

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Citation

Citation: Ramla Ismail and Ranjith R. “Measuring Cross Modal Plasticity Using Visual Evoked Potentials (VEP) in Children with Cochlear Implant".Acta Scientific Otolaryngology 4.11 (2022): 22-29.

Copyright

Copyright: © 2022 Ramla Ismail and Ranjith R. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.