https://www.sciencedaily.com/releases/2022/09/220920115627.htm > The model, which made the cover of the journal Proceedings of the National Academy of Sciences (PNAS), describes neural development over three hierarchical levels of information processing: > The team's research gives clues into the core mechanisms underlying cognition thanks to the model's focus on the interplay between two fundamental types of learning: Hebbian learning, which is associated with statistical regularity (i.e., repetition) -- or as neuropsychologist Donald Hebb has put it, "neurons that fire together, wire together" -- and reinforcement learning, associated with reward and the dopamine neurotransmitter.