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ABSTRACT: This study was aimed to investigate the effect of modulated low-level microwave radiation on the human electroencephalographic
(EEG) signal. The 450 MHz microwave exposure 100% pulse-modulated at 40 Hz frequency was applied to a group of 14 volunteers.
The field power density at the scalp was 0.16 mW/cm2. Ten cycles of the exposure (1 min on and 1 min off) were applied. The resting 9 channels EEG was recorded during 20 minutes
in exposed and sham conditions. The EEG spectral asymmetry index was calculated as a relative difference in powers of high
and low EEG frequency bands. The analysis revealed statistically significant changes caused by microwave exposure for the
whole group in temporal, parietal and occipital EEG channels. The exposure caused increase in the calculated EEG spectral
asymmetry index values related to increase in the EEG beta power.
Keywordsnon-ionizing radiation-microwave effect-human EEG-spectral asymmetry
12/2009: pages 406-409;
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ABSTRACT: The aim of this study was to investigate the changes in the EEG coherence produced by microwave exposure for healthy and depressive
persons. The experiments were carried out on two groups of volunteers: a group of healthy subjects and a group of patients
with major depressive disorder. Each group consisted of 18 female subjects. During 30 min experiment volunteers were exposed
to 450 MHz microwave radiation modulated at 1000 Hz. The field density at the scalp was 1,6 mW/cm2. The coherence values were calculated for FP1-T3 — FP2-T4, T3-P3 — T4-P4 and P3-O1 — P4-O2 channel pairs. The EEG theta (4–8
Hz), alpha (8–13 Hz), beta1 (13–20 Hz) and beta2 (20–40 Hz) frequency bands were selected for analysis. Statistical analysis
of calculated parameter for individuals with post-host Bonferroni correction was applied. The experiments demonstrated no
significant changes in the EEG coherence between exposed and not exposed conditions for healthy as well as depressive group.
However, the results showed significant changes produced by exposure in the EEG coherence for a part of subjects. In the healthy
group: 1) an increase occurred in the EEG coherence in theta and alpha rhythms, and the differences were statistically significant
over the frontal and temporal regions in theta (3 subjects, 16 %) and alpha (2 subjects, 11 %) rhythms, 2) decrease in alpha
(2 subjects, 11%) rhythm was statistically significant over the parietal and occipital regions. In the group of patients with
major depressive disorder microwave exposure caused statistically significant changes in the EEG coherence in beta2 rhythm
(2 subjects, 11 %) over frontal and temporal regions and in alpha (3 subjects, 16 %) over temporal and parietal regions.
12/2007: pages 331-334;
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ABSTRACT: This study is focused on evaluation of sensitivity of the brain to external microwave radiation. Up to this time all requirements
and limitations established by national and international regulations and recommendations for safety of electromagnetic fields
(EMF) are based on the quantitative data of EMF thermal effect. Analysis of different approaches for estimation of sensitivity
of the brain were applied in this study: theoretical sensitivity of living cell to microwave radiation, hypothesis of the
quasithermal effect, experimental data of microwave radiation effects on the brain, special experiments to avoid thermal effect,
experiments at radiation power density lower and higher than thermal limit. As a result it was shown that statistically significant
changes occurred in the EEG rhythms at microwave radiation power densities about 10 dB less than thermal limit. Clear dependence
of the results on modulation frequency confirmed that the effect has nonthermal origin. The intensity of the effect is not
linearly related to the applied field power density.
12/2007: pages 558-561;
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ABSTRACT: The experiments of adaptation of the human brain bioelectrical activity were carried out on a group of 14 healthy volunteers exposed to 450 MHz microwave radiation modulated at 40 Hz frequencies. The field power density at the scalp was 0.16 mW/cm2. Results of the study indicate that adaptation effect of human brain to low-level microwave exposure is evident. The initial increase of EEG power was compensated and even overcompensated. The adaptation phenomena were obvious in EEG alpha and beta rhythms.
Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE; 09/2007
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ABSTRACT: Three different methods in combination with integration of differences in signals were applied for EEG analysis to distinguish changes in EEG caused by microwave: S-parameter, power spectral density and length distribution of low variability periods. The experiments on the effect of modulated low-level microwaves on human EEG were carried out on four different groups of healthy volunteers exposed to 450 MHz microwave radiation modulated with 7 Hz, 14 Hz, 21 Hz, 40 Hz, 70 Hz, 217 or 1000 Hz frequencies. The field power density at the scalp was 0.16 mW/cm<sup>2</sup>. The EEG analysis performed for individuals with three different methods showed that statistically significant changes occur in the EEG rhythms energy and dynamics between 12% and 30% of subjects
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE; 10/2006
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ABSTRACT: The study compared traditional spectral analysis and a new scale-invariant method, the analysis of the length distribution of low-variability periods (LDLVPs), to distinguish between electro-encephalogram (EEG) signals with and without a weak stressor, a low-level modulated microwave field. During the experiment, 23 healthy volunteers were exposed to a microwave (450 MHz) of 7 Hz frequency on-off modulation. The field power density at the scalp was 0.16 mW cm(-2). The experimental protocol consisted of ten cycles of repetitive microwave exposure. Signals from frontal EEG channels FP1 and FP2 were analysed. Smooth power spectrum and length distribution curves of low-variability periods, as well as probability distribution close to normal, confirmed that stationarity of the EEG signal during recordings was achieved. The quantitative measure of LDLVPs provided a significant detection of the effect of the stressor for the six subjects exposed to the microwave field but for none of the sham recordings. The spectral analysis revealed a significant result for one subject only. A significant effect of the exposure to the EEG signal was detected in 25% of subjects, with microwave exposure increasing EEG variability. The effect was not detectable by power spectral measures.
Medical & Biological Engineering & Computing 02/2005; 43(1):142-9. · 1.88 Impact Factor
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ABSTRACT: This study is focused on low-level modulated microwave field effects on human EEG theta, alpha and beta rhythms at different modulation frequencies. During the experiment 13 healthy volunteers were exposed to a microwave (450 MHz) with 7 Hz, 14 Hz and 21 Hz frequency on-off modulation. The field power density at the scalp was 0.16 mW/cm(2). The experimental protocol consisted of five cycles of the repetitive microwave stimulation at fixed modulation frequencies. Changes in the EEG rhythms energy became evident in the case of modulation frequencies higher than the EEG rhythms frequencies. The changes varied strongly from subject to subject. Microwave exposure caused statistically significant changes in the EEG theta rhythm energy and for occipital channels in the alpha rhythm energy.
Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2004; 6:4225-8.
