[The characteristics of cortical interactions in high and low verbal creative subjects]

The characteristics of cortical interactions depending on level of creative achievements were investigated in 40 right-handed subjects (22 men and 18 women). The subjects were divided into the two groups with high and low ability by the originality score median split. EEG was recorded in rest and during task performance (the verbal creative task "Cognitive synthesis"). EEG coherence was computed in the six frequency range from 4 to 30 Hz. Total values of coherence for each of 16 sites, calculated separately for intrahemispheric and interhemispheric connections were analyzed. It was revealed that subjects with higher originality scores (OS) in comparison to low original ones were characterized by decreased the theta 1.2 rhythms interhemispheric coherence, that was expressed in the frontal cortex, and increased beta1-rhythm interhemispheric coherence in the occipital and temporoparietal regions of the brain. The obtained results are discussed from the point of view of the contribution of the right and left hemispheres of the brain to processes "top-down" and "bottom-up" regulation during creative thinking.