Say you read something, and it changes your neural structure. Then you write it down on a sheet of paper, extending your memory to the environment.
When you read it again, at what point is the human cognition not simply the production of the thing inside a skull, but also the paper?
Where is your mind, if it’s not just your brain?
My belief is that the mind is everywhere: the entire universe.
Any division is artificial. Divisions can help when creating specific theories and doing specific experiments, but they aren’t real.