Quantitative electroencephalographic activity over the left and right frontal, temporal, parietal, and occipital lobes was obtained on 4 successive weeks in 12 subjects before they were exposed cerebrally for 30 min to one of two configurations of weak complex magnetic fields or to a sham-field condition. The two configurations were Shakti (c Todd Murphy) and the set of 4 solenoids (Koren boxes) generating a burst-firing magnetic field through the temporal lobes. Compared to baseline measurements there were no statistically significant differences in treatments for relative changes in power over these regions within the delta, theta, low alpha, beta, or gamma ranges. However within the high alpha range (10.5 Hz to 13 Hz), there was a significant interaction between session and type of treatment that was due primarily to the Shakti treatment. These changes were congruent with the subjective experiences reported by some users of the technology.