In a policy document released this month, China has signaled its ambition to become a world leader in brain-computer interfaces, the same technology that Elon Musk’s Neuralink and other US startups are developing.Brain-computer interfaces, or BCIs, read and decode neural activity to translate it into commands. Because they provide a direct link between the brain and an external device, such as a computer or robotic arm, BCIs have tremendous potential as assistive devices for people with severe p...