I would say that nobody agrees, not that nobody knows. And it’s reductionist to think that the brain works one way. Different cultures produce different brains, possible because of the utter plasticity of the learning nodes. Chess has a few rules, maybe the brain has just a few as well. How else can the same brain of 50k years ago still function today? I think we do understand the learning part of the brain, but we don’t like the image it casts, so we reject it