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Abstract
A basic finding in developmental neurophysiology is that some areas of the cortex cortical areas will reorganize following a period of stimulus deprivation. In this review, we discuss mainly electroencephalography (EEG) studies of normal and deprivation-induced abnormal development of the central auditory pathways in children and in animal models.We describe age cut-off for sensitive periods for central auditory development in congenitally deaf children who are fitted with a cochlear implant. We speculate on mechanisms of decoupling and reorganization which may underlie the end of the sensitive period. Finally, we describe new magentoencephalography (MEG) evidence of somatosensory cross-modal plasticity following long-term auditory deprivation.
| Abbreviations | ||
| CAEP | = | Cortical auditory evoked potential |
| EEG | = | Electroencephalography |
| MEG | = | Magentoencephalography |
| sLORETA | = | Standardized low resolution electromagnetic brain tomography |
| MRI | = | Magnetic resonance imaging |
| fMRI | = | functional magnetic resonance imaging |
| Abbreviations | ||
| CAEP | = | Cortical auditory evoked potential |
| EEG | = | Electroencephalography |
| MEG | = | Magentoencephalography |
| sLORETA | = | Standardized low resolution electromagnetic brain tomography |
| MRI | = | Magnetic resonance imaging |
| fMRI | = | functional magnetic resonance imaging |
Sumario
Un hallazgo básico en neurofisiología del desarrollo es que algunas áreas de la corteza se reorganizan después de un período de deprivación de estímulos. En esta revisión, discutimos predominantemente sobre estudios electroencefalográficos (EEG) de desarrollo normal y de desarrollo anormal inducido por deprivación de las vías auditivas centrales en niños y en modelos animales. Describimos cortes de edad para períodos sensibles de desarrollo auditivo central en niños congénitamente sordos, a quienes se les ha colocado un implante coclear. Especulamos sobre los mecanismos de desacople y reorganización que pueden imperar al final del período sensible. Finalmente, describimos nuevas evidencias magentoencefalográficas (MEG) de la plasticidad de modalidad cruzada luego de una deprivación auditiva de largo plazo.