A neuroscience team at Facebook (NASDAQ: FB) recently restored a stroke victim's ability to speak using a brain-computer interface headset. Shortly after the research concluded, Facebook announced in a press release that the team is refocusing its efforts away from the technology, but it will open-source the software and hardware for outside development. Now, Facebook's neuroscientists are shifting their attention to wrist-based neural interfaces (in other words, a bracelet that can read your nerve signals) for use in VR and AR.