Afternoon sunlight poured over the high wooden barriers into the ring as the brave bull bore down on the unarmed “matador” — a scientist who had never faced a fighting bull.But the charging animal’s horns never reached the man behind the heavy red cape. Moments before that could happen, Dr. Jose M.R. Delgado, the scientist, pressed on a button on a small radio transmitter in his hand, and the bull braked to a halt.So begins the 1965 New York Times account of Delgado’s experiment in a bullfighting ring in Cordova, Spain. The previous summer, Delgado, a professor at Yale University’s School of Medicine who died five years ago this month, had fitted the bull with a device he invented called a stimoceiver. As small as a half-dollar, the device was a chip that could alter the brain’s electrical impulses via radio signal. Delgado published more than 100 peer-review papers on the use of this device, and though the effects varied, at times he was able to remotely control the emotions and behaviors of cats, bulls, monkeys, and yes, even humans.In a 2005 story in Scientific American, writer John Horgan describes how one of Delgado’s patients “clenched his fist when stimulated, even when he tried to resist. ‘I guess, doctor, that your electricity is stronger than my will,’ the patient commented.” Horgan adds, “Delgado could also induce fear, rage, lust, hilarity, garrulousness and other reactions.”Today, Delgado’s work is generally misrepresented or forgotten entirely. Google searches of his name lead to links to a variety of conspiracy theories, including many surrounding MK-Ultra, a real but short-lived CIA program that looked into mind control and is now blamed for everything from mass shootings to the erratic behavior of celebrities.After Delgado’s death in 2011, Dr. Barry Blackwell, a psychiatrist, was asked to write an obituary for Neuropsychopharmacology, the official publication of the American College of Neuropsychopharmacology, a professional organization of leading brain scientists.