I've been participating in both the research and the demonstrations for several weeks, and have often been surprised re the personal feedback. When I haven't liked the feedback I have wanted to diss the research and/or methodology. Fact is, in terms of social science research, they have nailed this down about as well as technology and scientific method allows so far, and accounted for handedness, etc.

Response time, within limits, is not compared to the response time of other people participating, but is compared to one's own variances in response time as the response matrix becomes more complex. At least as best I can figure.

I'm not a researcher but am fairly in touch with social science and psychological research and methodology, and this seems to be a pretty daggum sound project in terms of methodology from what I have read and researched.
Took me a little while to understand, though.