Walking on a treadmill is no great feat, unless your legs are being moved by a robotic device connected to your brain. A new brain-computer interface allows a person to walk using a pair of mechanical leg braces controlled by brain signals (above), as reported on arXiv. The device has only been tested on able-bodied people, and while it has limitations, it lays a foundation for helping people with paralysis walk again. The new device — developed by researchers at the Long Beach Veterans Affairs Medical Center and the University of California, Irvine – is controlled by electroencephalogram, or EEG, signals generated by small voltage fluctuations in the brain. The method is completely noninvasive, as the signals are measured by a cap worn on the scalp.