We know that the brain is a structure that works through electrochemical reactions. Synapses transmit signals sent by axons to neurons. We can test this. We can measure it. There's nothing else going on that we can describe using known science.

Ah, we might say, maybe there is an unknown science - we did not know about so much before, like electricity, like X-Rays, like quantum physics, and then we did, and the World changed.

The difference is that we observed something that science could not explain, and then we found the new science that explained it, and a new science was born.

It's pretty clear to me - but you may know more - that we can explain all brain activity through known science. It might be hard to think of us as nothing more than a bunch of electrochemical reactions in a real-world reinforcement learning system, but that's what we are: there's no gap that needs new science, is there?