FREQUENCY-SPECIFIC BLOCKING IN THE HUMAN BRAIN CAUSED BY ELECTROMAGNETIC-FIELDS

BASED on preliminary observations that continuous exposure to electrom agnetic fields (EMFs) produced an after-effect on human brain electric al activity, the effect of 10 Hz, 1 gauss, on the intrinsic activity o f the brain at that frequency was studied. Ten subjects were exposed f or 10 min and the 10 Hz spectral power was measured during the 1 min i nterval following stimulation and compared with control values obtaine d from the same subjects. Significantly reduced brain electrical activ ity from the occipital electrodes following termination of the EMF exp osure was observed, thereby confirming the preliminary results.