Abstract
We recorded ongoing EEG and measured mean values of the modal frequency (MF), absolute spectral power (ASP), and relative (normalized) spectral power (RSP) of the delta, theta, alpha rhythms, and beta1 and beta2 subrhythms in 31 children with inborn visual dysfunctions (average intragroup visual acuity of about 0.2) and 49 children with normal vision (age, from 8 to 12 years). Background EEG activity in children with visual dysfunctions was characterized by lower ASPs of all EEG frequency ranges (maximally, of the alpha rhythm), a lower RSP of alpha oscillations against the background of a higher RSP of the delta range (and that of beta2 subrange in boys), and also by higher MFs of slow-wave activity and of beta oscillations (beta2 and beta1 subranges in girls and boys, respectively); the MF of alpha activity in most cortical regions was unchanged. The data obtained are probably indicative of increased activity of the caudal brainstem regions related to the existence of visual dysfunctions; this results in changes in the pattern of interaction between activating and deactivating cerebral systems. Possible compensatory mechanisms influencing integrative activity of the brain under conditions of visual dysfunctions are discussed.
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