Can't concentrate? Can't control your anger? Try playing a video game, but in a most unusual way. Science specialist Ed Yeates reports on a new technique to control hyperactivity and attention deficit disorders.

About 150 to 200 patients - so far - have played a new version of pac man. This version is a psychological mind game that's getting both kids and adults off ritalin and other drugs.

12-year-old Trevor Hoyt is playing a video game - but without his hands! He controls the game with his mind, electrodes attached to his head. On the monitor, he maintains constant control of what are called his beta brain waves.

For 30 to 35 sessions, Trevor, Sam, Ryan, Andy and others play the games. All have various levels of attention-deficit hyperactivity disorder. As long as they hold this brain wave pattern, the pac man keeps chomping away at a faster rate. And patients learn how to concentrate and how to control their hyperactivity.

Andy says, "You don't use your hands and stuff but you just like use your head. You have to think about what you are doing." Ryan Hansen adds, "Like relaxing on the chair and then focusing on the game and they you can just make the stuff move."

Eventually patients don't need the games anymore. And many don't need drugs. Andy Prestridge NO longer takes Ritalin. And he can now sit in class and concentrate.

"It just like kicks in and it just helps you get to work on your homework," he says.

Trevor Hoyt says, "It's like concentrating on waht she is saying instead of hearing the beeps and stuff." Trevor not only suffered from ADHD. He had night terrors which even frightened his parents.

His father says, "He kicked me right over the back of a table one night. And he didn't even know he did it." But after the games, the night terrors disappeared. So did most of Trevor's hyperactivity. His mother, Cindy Hoyt noticed, "His self esteem is a lot better. He's happier. He's doing better at school. He's confident."

Biofeedback in the form of relaxation therapy has never worked for hyperactive kids. But this technique which apparently challenges and develops concentration and self-control has surprised many behavioral scientists.