Allaveganna.. http://www.cracked.com/article_18461_5-creepy-ways-video-games-are-trying-to-get-you-addicted.html
Moderator @ /fjarmal & /romantik.
It's written by a games researcher at Microsoft on how to make video games that hook players, whether they like it or not. He has a doctorate in behavioral and brain sciences.
“Each contingency is an arrangement of time, activity, and reward, and there are an infinite number of ways these elements can be combined to produce the pattern of activity you want from your players.”
Notice his article does not contain the words “fun” or “enjoyment.” That's not his field. Instead it's “the pattern of activity you want.”