In a quiet room, 30-year-old Noland Arbaugh sits in a wheelchair, dressed sharply in a green shirt, white blazer, and grey baseball cap. He smiles easily, but his story is anything but...

Neuralink, Elon Musk's brain-computer interface startup, has encountered a significant challenge in its pioneering journey to integrate advanced technology with the human brain. The company's first human test subject, Noland Arbaugh—a quadriplegic...