A method for optimum preparation and placement of transcranial electrodes is described. The method consists of application of liquid silver paint to standard monitoring electrodes and placement of bilateral electrodes over the pterions, the thinnest areas of the skull. This method minimizes the impedance between electrodes facilitating low power stimulation of the brain as measured by the phosphene threshold that has been redefined in this invention. The locations of the pterions vary between racial groups, but in most cases the pterions overlie the anterior temporal lobes. The anterior temporal lobe is contiguous with the amydala and hippocampus and stimulation of these limbic system structures has been known to produce fear, along with other altered states of consciousness. Low power square wave stimulation via these electrodes produces phosphenes at frequencies closely approximating the Schumann resonance frequency and its harmonics and theta, alpha, beta and gamma EEG frequencies of the brain. External electrical stimulation of the brain from changing electromagnetic fields may be targeted to the amydala or hippocampus and produce fear that is crucial for survival.
