Game Based on Pong, the Able-bodied Subjects Suc- Ceeded on 77% of Their Trials, and the Subjects with Cp Succeeded on 50%. over Half the Subjects with Cp Out- Performed the Worst Able-bodied User

ACKNOWLEDGEMENTS We thank Ron Williams for having the vision to undertake the CANDY project. We are also grateful to Frederick Brooks, Jr. of UNC Chapel Hill, whose suggestion of videotaping the trials led to several insights. The decomposition of the two-dimensional problem into its one-dimensional components is an idea borrowed from Marc Raibert [11]. Finally, we would like to thank our subjects and their families, without whose help this research would not have been possible.