Neural networks are about as much a model of a brain as a stick man is a model of human anatomy.

I don’t think anybody knows how we actually, really learn. I’m not a neuro scientist (I’m a computer scientist specialised in AI) but I don’t think the mechanism of learning is that well understood.

AI hype-people will say that it’s “like a neural network” but I really doubt that. There is no loss-function in reality and certainly no way for the brain to perform gradient descent.