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He’s counting on the audience to have a more “subliminal perception, that maybe music would transmit that without the words.”

But if an object which happens to be particularly exciting to the hypnotic stratum—for instance the hypnotiser's finger, used often as a signal for trance—is advanced into that part of the hysteric's normal visual field of which she has apparently lost all consciousness, there will often be an instant subliminal perception,—shown by the fact that the subject promptly falls into trance.

To make the dream come true, two young companies are peddling "subliminal perception," the psychological phenomenon whereby a sight too fleeting to register consciously takes root subtly in the viewer's subconscious mind.