Mechanism of low-level microwave radiation effect on brain: Frequency limits

Abstract

This study aims to investigation of frequency limitations for the recently proposed new mechanism of low-level microwave radiation (MWR) effect on human brain bioelectrical oscillations. The frequency dependent properties for the main steps of the mechanism, the rotation of dipolar water molecules, the disturbance of hydrogen bonds and the enhancement of diffusion, were evaluated based on published theoretical and experimental data. The investigation of frequency dependence of the MWR effect on the modulation frequency was performed using 450 MHz MWR, SAR 0.3 W/kg. The relative changes in electroencephalographic (EEG) signal power between the EEG segments with and without MWR exposure were selected as a measure for detection of the effect. Additional experiment at modulation frequencies 217 and 1000 Hz was performed and the raw data from our EEG database at modulation frequencies 14, 21, 40 and 70 Hz were also employed. Experimental results showed enhancement of EEG power with MWR exposure at all modulation frequencies; the changes were statistically significant at 14, 21, 40, 70 and 217 Hz. The analysis of published data confirms that the low-level MWR effect is limited to carrier frequencies up to around 100 GHz. The experimental results suggest that the effect of modulated low-level MWR on brain bioelectrical oscillations is not limited to the modulation frequencies within the EEG spectrum.