We discuss extremely important role of informational interactions. We demonstrate that using nonlinear dynamics one may assess which person is (hyper)sensitive to informational interaction of electromagnetic fields (EMF) used in mobile communication. While results obtained by spectral methods averaged over the group of persons might only suggest that some changes in brain dynamics are really due to influence of EMF, analysis of EEG of an individual person based on Nonlinear Dynamics and Deterministic Chaos Theory may reveal (hyper)sensitivity of this person to EMF. About 12% to 18% of population may belong to a high-risk (hyper)sensitive group of users of cellular phones (at least of certain models). Proposed method may serve for quick and easy assessment of individual susceptibility to EMF used in mobile communication as well as for testing different cellular phone models for their certification by the appropriate institutions.

nonlinear dynamics, informational interactions, deterministic chaos, EEG, signal processing, cellular phone, certification, hypersensitivity.