He discovered the Effect back in 1952 and the chances are that you know as much about it as I do. In a nutshell, he devised a germanium relay of such a nature as to respond to thoughtwaves, or anyway to the electromagnetic fields of the brain cells. He worked for years to build such a delay into a flute, so that it would play music under the pressure of nothing but thought. It was his love, his life, it was to revolutionize music. Everyone would be able to play; no skill necessary - only thought.
Then, five years ago, this young fellow at Consolidated Arms, Stephen Wheland, modified the Schlemmelmayer Effect and reversed it. He devised a field of supersonic waves that could activate the brain via a germanium relay, fry it, and kill a rat at twenty feet. Also, they found out later, men.
-- Isaac Asimov, Button, Button