Effect of modulated at different low frequencies microwave radiation on human EEG |
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Authors: | Hiie Hinrikus Maie Bachmann Jaanus Lass Viiu Tuulik |
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Institution: | (1) Department of Biomedical Engineering, Technomedicum of Tallinn University of Technology, 5 Ehitajate Rd, 19086 Tallinn, Estonia |
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Abstract: | This study is aimed to clarify whether effect of low-level microwave radiation on human brain differs at different modulation
frequencies. Resting EEG recordings were done on different groups of healthy volunteers. The 450 MHz microwave radiation modulated
at 40 and 70 Hz (15 subjects) and 217 and 1,000 Hz (19 subjects) frequencies was applied. The results of our previous study
at 7, 14 and 21 Hz modulation were included into analysis. Ten cycles of the exposure (1 min off and 1 min on) at each fixed
modulation frequencies were applied. The field power density at the scalp was always 0.16 mW/cm2. Our results showed that microwave exposure increased the EEG energy at EEG frequencies lower or close to the modulation
frequency. No effect was detected at EEG frequencies higher than the modulation frequency. Statistically significant changes
were caused by exposure in the EEG alpha and beta frequency bands; no significant effect was detected in the theta band. Our
results suggest that telecommunication devices with complex spectrum of modulation frequencies like mobile phone can affect
all human EEG frequency bands. |
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Keywords: | EMF effect Modulation Microwave radiation EEG rhythms Frequency dependence |
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