Have you ever used psychology in your game design work?

Has psych ever helped you make a game design decision?

Please share any experiences you may have had, below. :]

10 hours ago, Henrik Luus said:

Has psych ever helped you make a game design decision?

I think psychology is used in games all the time.  From action genres to thrillers.  All sorts of tricks are used to jump start the player's imagination and entice them into playing longer.  Rewards, Colorful pictures, engrossing stories and everything under the sun really.  Unless you're looking for something more specific, like... I don't know what?