The way of investigation some fundamental properties of integrative brain activity was worked out. Within the framework of the qEEG system for computer diagnostics of EEG NeuroResearcher^™'2001 (Version 7.5) is created modules for investigation of multivariate neurodynamic systems of the brain on the base of multidimensional spectral EEG and ESCoG analysis. It is intended for doctors and neuroscientists who use mathematical methods (classical correlation and spectral analysis and newest methods of multidimensional analysis of neurodynamic systems of the brain) for quantitative EEG (qEEG) successfully.