From: Hearing “Voices”: The Hidden History of the CIA’s Electromagnetic Mind Control Experiments by Alex Constantine (1995)
“In the 1920s, the development of the electroencephalograph (EEG)—an apparatus for detecting and recording brain waves—offered brain physiologists the key to unlock the mysteries of the body’s pivotal organ of thought, intellect and personality. While giving hope for a specific means of mapping mental-health ailments, the newfound electrical pattern to brain function also opened a monstrous Pandora’s box: possible radio control of the mind. In 1934 Doctors E. L. Chaffee and R. U. Light published “A Method for Remote Control of Electrical Stimulation of the Nervous System,” an introductory monograph on electromagnetic mind-control methodology. In 1964, electromagnetic-response (EMR) researcher Dr. José Delgado of Cordoba, Spain, climbed into a bullring and, with the push of a button, triggered an electrode implanted in the brain tissue of a charging bull, halting the beast in its tracks.
Also in 1934, Russian physiologist L. L. Vasiliev published “Critical Evaluation of the Hypnogenic Method,” an article detailing the experiments of Dr. I. F. Tomashevsky in remote-radio control of the human brain “at a distance of one or more rooms and under conditions where the participant would not know or suspect that she would be experimented upon.” Reported Vasiliev, “One such experiment was carried out in a park with the subject at a distance. A post-hypnotic mental suggestion to go to sleep was complied with within a minute.””