But your initial posit was devolving, which I think is an impossibility. I came out a door and waved a raccoon out of the trash and led it across the street. After we negotiated this movement i bowed and said thank you, because I'm weird. But the raccoon bowed back. The chaos everything looks like, evolution only sharpens. Wild animals negotiate with predators and point out the idiots to kill.
The brain will not degrade.