Tech billionaire Elon Musk said his Neuralink company is seeking permission to test its brain implant in people soon. During a presentation Wednesday, he said his team is in the process of asking U.S. regulators to allow them to test the device in people. He says he thinks that might happen in about about six months, though that timeline is far from certain. His company’s efforts are part of the growing field of brain-computer interface technology, which has been making strides in various arenas. Musk said the first two applications would be restoring vision and helping people who can’t use their muscles operate digital devices.