Her team is already making headway. Last year, they processed the neural activity of a monkey and translated it into spinal stimulation that moved a second, sedated monkey's hand. The system doesn't work perfectly yet, but Shanechi has recently developed a more accurate model that tracks the brain's activity by the millisecond. She's also working on algorithms to help the brain self-regulate, providing stimulation that alleviates depression or post-traumatic stress disorder. Decoding mood is even more difficult than deciphering movement, but Shanechi says, "That's what makes it interesting."