A very good example of this is so-called “subliminal advertising” This was a technique used some years ago by which products were advertised in the movie theaters or on television by flashing for a very short time a message on the screen. The public was never aware of what was happening since the message was too short to activate the conscious mind into producing a coherent thought image. But the subconscious mind, being much quicker, did pick up the message, and people dutifully consumed the advertised products. These techniques have fortunately since been outlawed.
