Among the most exciting developments in games is the brain-game interface. Developed first by NASA, video  games use bio-feedback to train pilots to stay alert during long flights and calm during emergencies (Pope & Bogart 1996; Mason et al. 2004). The technology is now commercially available (CyberLearning’s SMARTBrainGames) for Sony PlayStation and Microsoft X-box to target symptoms arising from brain injuries, attention -deficit hyperactivitydisorder (ADHD) and learning disabilities. The system allows off-the shelf video games (racing games are best) to be controlled through brain wave activity. The more focused and faster your brain is working, the faster your car accelerates, and the easier it is to play the game. When brain waves aren't in "the zone" the controller makes it harder to accelerate and steer.

referances : 

Pope, A.T. and Bogart, E.H. (1996). Extended attention  span training system: video

Game neurotherapy for attention deficit disorder. Child Study Journal, 26 (1), 39-50

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This article covered all vedio games not just this variety. The portion I showed above appears on page 5 - includes varfyable research studies(in quotation), and referances which I will not bother you guys with. Heck you can e-mail the fricken author.

More infor about  for those interested biofeedback in general gives a good educational over view, and are provided by decent sources.

Several companies compete for the most intriguing forms of feedback, varieties of data analyses provided for therapists and range of features and display alternatives. Recently, Allen Pope of NASA's Human Engineering Group and Edward Bogart of Lockheed Sciences, have gone so far as to develop the concept even further by producing a video game which becomes more difficult as the attention deficit disordered child's brain waves show attention is waning (Pope & Bogart, 1991, in press). As in the more established focus of neurotherapy, this approach teaches children to decrease the time spent in slow wave activity and increase the time spent in the fast activity required for focused attention and concentration on tasks. It takes 40-80 sessions (40 minutes to I hour each) for neurotherapy to produce lasting EEG and clinical changes. Follow-up neurometric and clinical assessments should be conducted upon completion of the course of treatments and at about I month, 6 months, and I year follow-ups.

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Chrissie - I bid you good luck, you ever need any help with researching any thing on ADD feel free to PM me. This site does have one of those systems does it not?

Did I meantion I wasn't asking notellin to help me do research -her remark " do your own research" I don't have time for you - lucky me I do not need her time or help - I was trying to help apparently she didn't have time to see that either - sorry Chrissie  - back to mildly snarkley - now if my not fan club can refrain  from  make rude snide sheesh remarks at me -  I promise to go away and leave you to ???? Heck done forgot . . . .must be the ADD!