1. EEG developmental course in children with difficulties of social interaction and superior IQ N.L.Gorbachevskaya, E.Y.Davidova, A.B.Sorokin, S.O.Petrova, V.M.Bashina Mental Health Research Centre RAMS, Psychological Institute RAD, Moscow The neuroimaging and EEG studies revealed the deterioration of neuroontogenetic course in autistic children. It is also known, that children with higher intelligence level often have difficulties in social interaction.

2. The aim of this study was to describe EEG changes in children with difficulties of social interaction, extremely high learning motivation and superior intelligence, who had subtle form of Asperger syndrome at 6-7 years old. Method. A follow up QEEG-study of 11 children (aged from 7 to 16 years) was performed 3 or 5 times. QEEG investigation was performed on 16 channels computer EEG recording system (Brainsys, Russia). The EEG- study included comparison of spectral power density (SPD) between groups of boys with high and average intellectual ability.

3. Number of errors in general auditory (SA) and visual memory (SV) tests Children with superior intelligence level make less mistakes in memory tests at any age.

4. Age development of alpha-rhythm frequency ratio (alpha1/alpha3) In the EEG of children with superior intelligence until the age of 13 the alpha1/alpha3 ratio is significantly higher.

5. Z-score of Alpha1/Alpha3 ratio comparison between children with superior and average intelligence In the EEG of children with superior intelligence at the age of 16 there is more alpha3 component in occipital regions.

6. Conclusions The longitudinal EEG study demonstrates deterioration of normal alpha activity developmental course in children with superior intelligence and problems with social interaction. Prolonged low alpha frequency stage as a part of specific disontogenetic EEG age course can reflect the higher level of psychophysiologic plasticity and may be result of more effective early neurodevelopment such as e.g. synaptogenesis and apoptosis.