... This meme or theory about how ads work — by emotional inception — has become so ingrained, at least in my own model of the world, that it was something I always just took on faith, without ever really thinking about it. But now that I have stopped to think about it, I'm shocked at how irrational it makes us out to be. It suggests that human preferences can be changed with nothing more than a few arbitrary images. Even Pavlov's dogs weren't so easily manipulated: they actually received food after the arbitrary stimulus. If ads worked the same way — if a Coke employee approached you on the street offering you a free taste, then gave you a massage or handed you $5 — well then of course you'd learn to associate Coke with happiness.