Next time your in a room with a television on, and a bunch of people are talking about a movie you dont want to know the ending to, watch the tv and see how hard it is to be able to remember what the program was about. While they talk about the film, if you can concentrate on the tv and shut them out totally you are one super strong concentrator. I had the worst time doing it (maybe cause i was high, but it was sooo hard) I think it was just real hard cause i was high.