Thirteen young volunteers (4 male; aged 21-30) participated in this study. EEGs were recorded while the subjects were exposed or sham-exposed to RFR at 450 MHz. The power density was 0.16 mW/cm², and the SAR was estimated at 0.35 W/kg. Each subject was exposed or sham-exposed twice in sessions lasting 40 minutes. The first 10 minutes consisted of a reference series. In each of the other 3 ten-minute segments, there were 5 cycles of 1 minute on and 1 minute off, and the modulation was 7, 14, or 21 Hz. The exposure status was randomized and double-blind. The subjects were resting and awake during the sessions.
A relative change in the EEG power with and without power was used
to quantitate the results. There was an increase in the average EEG
alpha and beta power during the first 30 seconds of RFR exposure
at 14 and 21 Hz modulation. The theta rhythm was unaffected and no
difference in EEG power was seen at 7 Hz modulation. Differences
were found in individual sensitivity and increases in EEG beta power
were statistically significant in the case of four subjects.