The experiments were conducted on 33 healthy subjects (24 men and 9 women) in the age range of 20-59 years. Each subject participated in two sessions: one session included the sham exposure and the other session consisted of the exposure set-up with exposure periods for 2 minutes at each frequency, beginning with the highest frequency in a decreasing order and in between one minute EEG recording without exposure. One half of the subjects received exposure followed by sham exposure (exposure 1, sham exposure 2) , the other half was sham exposed first, followed by exposure (sham exposure 1, exposure 2).
|Chamber||test person lies between the coils in a darkened and sound proof RF anechoic chamber|
|Setup||pair of circular Helmoltz coils with a radius of 65 cm and 250 turns of 0.8 mm copper wire each; exposure over the head of the test person; field perpendicular to the earth's north-south magnetic field|
|Sham exposure||A sham exposure was conducted.|
The exposure 1 (group which was exposed first, followed by sham exposure) indicated a significant increase in beta waves at the frontal brain region, and a significant decrease in the alpha waves in parietal and occipital brain regions in the exposure 2 (exposure was conducted after sham exposure) . Significant decrease in the alpha waves at the occipital brain regions were observed in sham exposure 2 (sham exposure which followed electromagnetic irradiation).