Quite likely a setup and not some psychological effect. He's relied on similar tricks in the past, such as using video effects to "predict" the lottery [1] and a fake casino set under the pretense of calculating the trajectory of a roulette ball [2].

[1] http://www.youtube.com/watch?v=QG-5qebwflA See drdirs's comment. [2] http://www.youtube.com/watch?v=RVThCpMPON0 See mazotu's comment.