Effect of 450 MHz Microwave Modulated with 217 Hz on Human EEG in Rest |
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| Authors: | Maie Bachmann Maksim Säkki Jaan Kalda Jaanus Lass Viiu Tuulik Hiie Hinrikus |
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| Institution: | (1) Biomedical Engineering Centre, Tallinn University of Technology, 5 Ehitajate Rd, 19086 Tallinn, Estonia;(2) Institute of Cybernetics, Tallinn University of Technology, 21 Academy Rd, 12618 Tallinn, Estonia;(3) Biomedical Engineering Centre, Tallinn University of Technology, 5 Ehitajate Rd, 19086 Tallinn, Estonia |
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| Abstract: | Summary This study focuses on discrimination of changes, produced by low-level microwave exposure in intensity and time variability
of the human EEG at rest. The power spectral density (PSD) method and nonlinear scaling analysis of the length distribution
of low variability periods (LDLVP) were selected for analysis of the EEG signal. During the study, 19 healthy volunteers were
exposed to a microwave (450 MHz) of 217 Hz frequency on-off modulation. The field power density at the scalp was 0.16 mW/cm2. The experimental protocol consisted of ten cycles of repetitive microwave exposure. Signals from frontal, temporal, parietal
and occipital EEG channels on EEG theta, alpha and beta rhythms were analysed. Exposure to microwave causes average increase
of EEG activity. LDLVP analysis discriminated significant effect in time variability for 2 subjects (11%). PSD method detected
significant changes in intensity for 4 subjects (21%). The effect of low-level microwave exposure is stronger on EEG beta
rhythm in temporal and parietal regions of the human brain. |
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| Keywords: | EMF effects nonionising radiation microwave radiation time variability scaling analysis spectral analysis EEG rhythms |
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