A lot of brain science these days is basically "turn off this part of the brain, see what happens." We've gotten good at it and can usually guess the outcome, but at the core that is the usual idea. There is a drastic impact on people's ability to think, visualize, and a whole bunch of other "mind- related" tasks when we turn off brain areas or physically remove them so that is why the current assumption is that it's in the brain.
RewRiteRealityWithMe t1_j2f1lbo wrote
Reply to ELI5: How did we realise the mind is in the brain? by theembryo
A lot of brain science these days is basically "turn off this part of the brain, see what happens." We've gotten good at it and can usually guess the outcome, but at the core that is the usual idea. There is a drastic impact on people's ability to think, visualize, and a whole bunch of other "mind- related" tasks when we turn off brain areas or physically remove them so that is why the current assumption is that it's in the brain.