Oh my God. Yes! Please for the love of all that is good stop worrying about/thinking about/talking about biological plausibility. ANN, AI, machine learning, deep learning, whatever your chosen field. Theories of how the human brain works are legion, and they are just that, theories. In all likelihood most are wrong or at best only partly right. Trying to pattern a (whatever it is you do in your field) after something about which we know so very little is absolutely ridiculous. Claiming that it is “intelligent” or “learning” is even more so. Assuming we can agree on what those terms mean (we can’t but I will continue my argument anyway) we certainly don’t know how humans or animals are/do them. We have theories but we don’t know, not even close, certainly not in humans. We would all be so much better off and I could stop bitching so much if computers could just be computers and biologicals just be biologicals. If we happen to have some things in common great, if not, who cares. Forget biology compu/techno/math-researchers and focus on what you know. Count yourself lucky that you can know it.