"As the rate of technological development speeds up, the gap between science fiction and what we’re living now is getting narrower all the time."
The idea that people could learn while asleep was a source of continuing fascination to people in the early 20th century.
The first use of this idea outside science fiction was apparently the invention of the "Psycho-Phone" by In 1927 by Alois Benjamin Saliger . He asserted that "It has been proven that natural sleep is identical with hypnotic sleep and that during natural sleep the unconscious mind is most receptive to suggestions." Modern research indicates that "sleep teaching" doesn't really work.
(Hypnobioscope from 'Ralph 124c 41 +' by Hugo Gernsback)
Unlike the devices used to present information to the brain by the roundabout method of playing it out loud and then entering through the ears, the hypnobioscope acts directly on the brain itself.
This illustration appeared in Wonder Stories in 1938:
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