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"[Science fiction is ] That branch of literature which is concerned with the impact of scientific advance upon human beings."
- Isaac Asimov

Psychode  
  A device that enables communication by thought alone.  

"Dr. Kallent had done some work, years before, toward identifying thought as a radiogen phenomenon, a subatomic radiation. Following that clue, in a direction that somehow came to me in those dreams, I made the psychode."

The thin man paused again, in that small drumming space, took down a queer-looking helmet from the wall, and fitted it to his white head. A great horseshoe tube arched above the crown, its electrodes against his temples. Golden flame burned through it when he touched a knob.

"It picks up thought-energy," he explained, "amplifies it regeneratively, heterodyned upon ultra-waves, and rebroadcasts it, thus serving as both receiver and transmitter for tele-mental communication."

From The Infinite Enemy, by Jack Williamson.
Published by Thrilling Wonder Stories in 1938
Additional resources -

Compare to the Thought-receptor Vote-counting Machine from If the Sun Died by RF Starzl (1931) and the communications implant from Niven and Pournelle's 1981 novel Oath of Fealty and Mechanical Thought Transformers from LF Stone's 1931 story Conquest of Gola.

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Additional resources:
  More Ideas and Technology from The Infinite Enemy
  More Ideas and Technology by Jack Williamson
  Tech news articles related to The Infinite Enemy
  Tech news articles related to works by Jack Williamson

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