Yoshiyuki Sankai, a professor at the University of Tsukuba in Japan has developed the "hybrid assistive limb," or HAL designed to help people suffering from muscle loss or partial paralysis walk. HAL is made up of frames for leg support, motors placed at knees and hip joints, detection sensors and a computer controls the system. When the wearer tries to move a leg, the sensors detect through the skin faint electrical signals transmitted from the brain to muscles. The computer analyzes what the user is going to do, and the motors start moving to support the user's motion.

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