What's this kind of "advertising" called?

Question

I heard that movie theaters used to use it to sell more snacks and drinks, by like inserting pictures of popcorn or soda in the middle of a movie for like small fractions of a second, so that you couldn't consciously see it, but you're mind sub-consciously saw it, which made you want it, which increased the theaters sales.

I think it was made illegal, though, because you were "brainwashing" people to buy things.

If any of that made sense, lol.

Thank you.

Answer 1

It is a form of subliminal advertising or persuasion.

Answer 2

I remember a big thing about that.

I call it Behind Closed Doors Deceptive Advertising!  :)

Subliminal.

Answer 3

My guess is "subliminal" advertising.  

Answer 4

Subliminal advertising - it is illegal today (at least in North America)

Answer 5

Subliminal. And yes, the FCC banned subliminal use of pictures in advertising if used at a rate that the human eye can't detect.

Answer 6

It's a subliminal message.