It was like a lecture strip in a subliminal training projector at the Bene Gesserit school …. but faster …. blindingly faster.
There are no more uses of "subliminal" in the book.
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It is illegal to flash commercial subliminal messages on television.
Back in the ’50s, there was a fuss over a brainwashing technique known as subliminal communication. A movie theater found that if its films included tiny blips of commercials for popcorn and soda —moving past so quickly that the viewer did not consciously realize he was seeing them—popcorn and soda sales went up. These results were highly uncertain, though, and the technique was abandoned. Since 1957 it has been against FCC policy to permit subliminal techniques on television.
Time, Inc., 1978 -- http://www.time.com/time/magazine/article/0,9171,919705,00.html#ixzz0wJUJtWQO(retrieved 08/11/10)