This study focuses on the effect of low level microwave radiation on human EEG alpha and theta rhythms. During the experiment, 20 healthy volunteers were exposed to a 450 MHz microwaves with 7 Hz on-off modulation. The field power density at the scalp was 0.16 mW/cm2. Signals from the following EEG channels were used: FP1, FP2, P3, P4, T3, T4, O1, and O2. The experimental protocol consisted of one cycle of short term photic and ten cycles of the repetitive microwave stimulation. The changes caused by photic as well as microwave stimulation were more regular on the alpha rhythm. In the majority of cases, photic stimulation caused changes in the EEG energy level in the occipital and microwave stimulation in the frontal region. Our experimental results demonstrated that microwave stimulation effects became apparent, starting from the third stimulation cycle. Changes varied strongly from subject to subject. Therefore, photic and microwave exposure did not cause statistically significant changes in the EEG activity level for the whole group. For some subjects, clear tendencies of changes in microwave on-off cycles were noticeable.

Absfrucf-The effects of microwave radiation on the electrical activity of human brain have been studied on a small group of young healthy volunteers. For estimation of the location of possible effects, the following EEG channels were utilized: F3, F4, T3, T4, 0 1 , 0 2 . The experiments included repeated microwave radiation at 450 MHz with modulating frequency 7 Hz and 16 Hz photic stimulation. For comparing the brain activity in different situations, three parameters from the EEG bispectrum were calculated. The results indicate that those parameters could not detect the influence of very low microwave radiation. However, the first parameter named normalized alpha could detect the onset and the end of photic stimulation in occipital region and the onset of photic stimulation in the frontal and temporal region. As far as microwave radiation is concerned, those parameters should be analyzed again while more intense fields are studied.

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