The influence of the formal-dynamic characteristics on the activity of the two brain operation systems, the left-hemispheric one (successive analysis) and the right-hemispheric one (simultaneous analysis) was studied in 20 right-handed subjects using the technique of topographic mapping of cortical electrical processes. The psychological testing was performed according to Strelyau while the temperament was tested by Eysenck. A set of variables was determined which positively affect both brain operation systems as well as each of them separately. We believe that the interindividual variability of the brain information processing is a result of its modulation by different psychological characteristic blocks.