A Brainwave-Controlled Version of "Pong"
From: Popular Science - 08/2012 - page 76
By: Ian Chant

Few video games are more basic than Pong, but Charles Moyes and Mengxiang
Jiang’s version is incredibly complex. The two Cornell University students
built a custom electroencephalography (EEG) device so they could control the
game’s onscreen paddle with their minds.  

Read the entire article at
http://www.popsci.com/technology/article/2012-07/brainwave-controlled-version-pong

Links:
Brain-Computer Interface (with video
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2012/cwm55/cwm55_mj294/index.html

EEG Pong on ATmega644 (2:03 video)
http://www.youtube.com/watch?v=uYQfdA2tXbc