Starting this blog, I realize the brain-controlled devices are not an imaginative sci-fi gadgets anymore but something technologically achievable and economically affordable. At the annual White House Science Fair, a 17-year-old boy introduced his creation: a mind-controlled prosthetic arm (see the link below).
http://techcrunch.com/2013/04/22/3-awesome-and-inspiring-inventions-from-the-white-house-science-fair/
The arm is controlled by his concentration (a pattern of brain wave) and eye blinks, moves smoothly, and shakes hands with him.
Furthermore, he sells it for $250, thanks to the low-cost modelling by a 3D printer; it's a collaboration of two cutting-edge technologies. So far the product appearance is rough and there are many rooms to be sophisticated, in my opinion. But no doubt the future is on this way!
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