That's why they're testing on pigs first. But even if this is not viable in humans, this will be HUGE for neuroscience and our understanding of the brain. Because right now our understanding of the brain is limited to a large extent by the inability to capture information from it in realtime, and inability to selectively stimulate it. That neuroscientist quoted upthread should be in awe of these new capabilities. It's like he's working with stick and twine and someone showed him a rocket engine. Instead they just sound like sour grapes - Neuralink is doing something an academic has no ability to do and will never have the ability to do because he's in academia and he can't build surgical robots or microscopic tungsten carbide wires.