A Search for Early Predictors of Mental and Speech Disorders: Neurophysiological Aspects

Data from neurophysiological examinations were summarized for children with mental development disorders of perinatal genesis. Hypothetical sources of slow activity were found in the frontotemporal cortex bilaterally. An increase in the power of slow components was shown to correlate with the severity of mental developmental disorders. New data were obtained to indicate that local and distributed (“global”) sources of EEG rhythms have a potential as neuromarkers of psychoverbal retardation in early ontogeny. A high level accuracy was observed for a classification of the children on the basis of these potential neuromarkers.