Thanks for the clarification! And so, concerning these other terms I mentioned what’s the exact relation of mereology to them?

Emergence would be the opposite right? Because it in fact indeed treats the brain as a whole and goes as far to say that it’s something even bigger than its singular parts.

Eliminative materialism sounds synonymous but not completely identical with mereology to me because it implies that parts give a whole just only the parts and not something else like in emergence.

I’m asking because I’ve seen these exact terms used on an older discussion on this sub concerning the same topic