I second what EGreg said. You have the additional problem that "brain regions" aren't composed of cells, they're composed of circuits, and neurons themselves c

I second what EGreg said. You have the additional problem that "brain regions" aren't composed of cells, they're composed of circuits, and neurons themselves come in multiple kinds that have different roles in neural circuits. Then you get the problem that saying, "it's circuits built into regions built out of neurons" doesn't make any predictions about the system as a whole. So, at the very least, this stratospherically high-level overview is incomplete.