Elon Musk's Neuralink rival Precision Neuroscience got US Food and Drug Administration approval for its brain implant system's critical part, Layer 7 Cortical Interface, a high-resolution cortical electrode array. "It's used for recording, monitoring, and stimulation of electrical activity on...brain's surface," firm said. "Clearance allows...array to remain implanted for up to 30 days," it added.