Changes of brain electric activity nonlinear dynamics brain electric activity in girls with visual dysfunction

I. V. Redka, O. Yu. Mayorov

Abstract


An assessment of neural systems of the brain of girls with visual dysfunctions (congenital and acquired) and sighted girls has been examined by methods of nonlinear analysis in resting state with eyes closed. We studied embedding dimension, correlation dimension, the maximum Lyapunov exponent and Kolmogorov-Sinai entropy. It has been found that the visual dysfunction lead to brain functionality reorganization in girls at 8 to 12 age during resting-state with eyes closed. This changes has been dependent in acquisition time of visual dysfunctions and visual acuity.  The changes in neurodynamics of ventrolateral prefrontal cortex are characteristic features in congenital visual dysfunctions compared with control and acquired visual dysfunctions. Generalized increase in the level of chaos in the brain electrical activity is a characteristic feature of neurodynamics in acquired visual dysfunctions. The changes in neurodynamics of temporal areas in visual dysfunctions may reflect changes in the activity of auditory perceptual system. Nonlinear analysis techniques  provide additional information  of  brain neurodynamics systems during normal and pathological conditions.

Keywords


EEG; nonlinear dynamics; visual dysfunction girls

References


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