A man paralyzed from the shoulders down has been able to walk using a four-limb robotic system, or exoskeleton, that is controlled by signals from his brain. /VCG Photo

The 30-year-old patient, who was identified only by his first name, Thibault, said it was a feat for him to walk since he hadn't moved for two years. /VCG Photo

French scientists implanted a system of sensors near the patient's brain, which could send signals to the robotic system, moving the legs and arms. Researchers say the approach could one day improve patients' quality of life. /VCG Photo