In a recent 2-part article by researcher Nick Begich titled 'Mind Control:
The Ultimate Brave New World', subtitled - Technologies for stimulating the brain and controlling the mind can have benefits, but they have a dark side that military and intelligence planners have been exploiting for decades - he discusses the military implications of energy-directed technologies. Excerpt:
"The idea that the brain can be made to function at a more efficient and directed level has been the subject of research by scientists, mystics, health practitioners and others for as long as mankind has contemplated such matters. In the last decade, advances in the science of the brain have begun to yield significant results. The results of the research are startling, challenging and, if misused, will be frightening. The certainty to be expected from the research is that it will continue to proceed.
The idea that people can be impacted by external signal generators which create, for example, pulsed electromagnetic fields, pulsed light and pulsed sound signals is not new. The following information demonstrates some of the possibilities and gives hints of the potentials of the technology."
Again, more material worth reading on the notion of brain-frequency manipulation occuring in modern technologies that are creeping into more civilian areas.