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Individual changes in human EEG caused by 450 MHz microwave modulated at 40 and 70 Hz |
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| Authors: | Maie Bachmann Ruth Tomson Jaan Kalda Maksim Säkki Jaanus Lass Viiu Tuulik Hiie Hinrikus |
| Institution: | (1) Department of Biomedical Engineering, Technomedicum of Tallinn University of Technology, 5 Ehitajate Rd, Tallinn, 19086, Estonia;(2) Institute of Cybernetics, Tallinn University of Technology, 21 Academy Rd, Tallinn, 12618, Estonia |
| Abstract: | This study was aimed to investigate the changes in the human electroencephalographic (EEG) signal caused by modulated low-level microwaves. The 450 MHz microwave exposure modulated at 40 Hz and 70 Hz frequencies was applied to a group of 15 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) at both modulation frequencies were applied. Analysis of the EEG signal was performed using three different methods: nonlinear method of scaling analysis for length distribution of low variability periods (LDLVP), relative changes in EEG energy (S-parameter) and beta ratio (H-parameter). The analysis revealed significant changes caused by microwave for the whole group (H-parameter method). The exposure caused increase of the EEG beta power (S-parameter method). Statistically significant changes in EEG were detected for four subjects (26.7%) at 40 Hz modulation frequency (LDLVP method). |
| Keywords: | EMF effects Time variability Scaling analysis Quantitative EEG Spectral analysis |
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