Gregoire Courtine, a neurologist at the Swiss Federal Institute of Technology, holds a silicone model of a primate's brain with an electrode array. The goal is to pick up signals from the brain and transmit them to the legs. Alain Herzog/EPFL hide caption

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Alain Herzog/EPFL

Monkeys Regain Control Of Paralyzed Legs With Help Of An Implant

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Ian Burkhart prepares for a training session in Columbus, Ohio. To move muscles in Burkhart's hand, the system relies on electrodes implanted in his brain, a computer interface attached to his skull, and electrical stimulators wrapped around his forearm. Lee Powell/The Washington Post/Getty Images hide caption

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Lee Powell/The Washington Post/Getty Images

Technology Helps A Paralyzed Man Transform Thought Into Movement

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By increasing the amount of serotonin in the spinal cord, an experimental drug helps nerve connections work better. Bee Smith/Ocean/Corbis hide caption

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Bee Smith/Ocean/Corbis

A Drug Might Heal Spinal Injuries By Sparking Nerve Growth

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Kent Stephenson, a research participant at the University of Louisville's Kentucky Spinal Cord Injury Research Center, has his level of muscle activity and force measured by Katelyn Gurley. Courtesy of the University of Louisville hide caption

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Courtesy of the University of Louisville