The development of new information technologies is associated with necessity for defense of the information processed using computing machinery. Among other things, the active means of information defense include noise oscillators.
The aim of this report is to investigate the functioning of the central nervous system influenced by the waves from a noise oscillator when radiation absorbing screens are used. The screens № 5 and № 6 were based on metallic components and tailings of the refined cupola gases, respectively. The functioning of a central nervous system is reflected in human electroencephalograms processed using the nonlinear analytical method – delayed coordinate method.
The electroencephalograms of 20 volunteers were processed in 16 leads: Fp1 – A1, Fp2 – A2, C3 – A1, C4 – A2, O1 – A1, O2 – A2, T3 – A1, T4 – A2, These leads were registered by a Neurocartograph electroencephalograph according to the regulated «10-20» scheme. Reliability of the parameters calculated was defined with the use of the discrimination statistics.
The spectral power densities of alpha-, beta-, and theta- rhythms of electroencephalograms were defined. The electroencephalograms were processed in four regimes: background (regime 1); noise oscillator (regime 2); noise oscillator, screen 5 (regime 3); noise oscillator, screen 6 (regime 4).
The comparative analysis parameters were as follows: correlation dimension; Kolmogorov entropy; spectral power densities of the alpha-, beta-, theta- rhythms of electroencephalograms. The results indicated activation of the brain processes influenced by the noise oscillator waves. For example, radiation of the noise oscillator has lead to an increase in the correlation dimension by 5.6 % relative to the background. The combined effect of the noise oscillator waves and screen № 5 or noise oscillator waves and screen № 6 has resulted in the correlation dimension decreased by 1.5 % and increased by 0.4 % for the leads T3 – A1, T4 – A2. The Kolmogorov entropy of electroencephalograms was lowered by 22.7%. The combined action of radiation from the noise oscillator and screen № 5 or radiation from the noise oscillator and screen № 6 caused lowering of the Kolmogorov entropy by 47.7 % and 53.3 %, respectively. The spectral power density of the alpha-rhythm was increased by a factor of 3.3. The spectral power density of the alpha-rhythm was increased by a factor of 2.1 and 1.6 when using screens №5 and №6, respectively.
So, the use of the radiation absorbing screens together with the noise oscillator has allowed to reduce the Kolmogorov entropy and spectral power density of the alpha-rhythm with respect to the background. It may be concluded that these effects are positive for practical application of the investigated systems.