Cross-modal plasticity in Cuban visually-impaired child cochlear implant candidates: topography of somatosensory evoked potentials.

MEDICC Review
Lidia E Charroó-RuízLourdes Díaz-Comas

Abstract

Studies of neuroplasticity have shown that the brain's neural networks change in the absence of sensory input such as hearing or vision. However, little is known about what happens when both sensory modalities are lost (deaf-blindness). Hence, this study of cortical reorganization in visually-impaired child cochlear implant (CI) candidates. Assess cross-modal plasticity, specifically cortical reorganization for tactile representation in visually-impaired child CI candidates, through study of topography of somatosensory evoked potentials (SEP). From April through September 2005, SEP from median and tibial nerve electrical stimulation were studied in 12 visually-impaired child CI candidates aged 3-15 years and 23 healthy controls. Following placement of 19 recording electrodes using the International 10-20 System , SEP were recorded and then processed. Topographic maps were obtained for SEP N20 (median nerve) and SEP P40 (tibial nerve), permitting assessment of cortical reorganization by comparing visually-impaired, deaf children's maps with those of healthy children by means of visual inspection and statistical comparison using a permutation test. SEP N20 topography was significantly more extensive in visually-impaired child CI ...Continue Reading

Citations

Jan 21, 2016·Nature Communications·Todd M MoweryDan H Sanes
Jul 13, 2014·Research in Developmental Disabilities·Flemming Ask Larsen, Saskia Damen
Feb 6, 2015·Frontiers in Integrative Neuroscience·Nadine HauthalJeremy D Thorne

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