Maybe more specific examples would be useful. If my lungs are failing, my brain gets less oxygen, and functions differently. When my childen are hungry, they

Maybe more specific examples would be useful. If my lungs are failing, my brain gets less oxygen, and functions differently. When my childen are hungry, they definitely behave differently, and I attribute the cause of that to their lack of food. If my wife or friend is in a lousy mood, my mood may sour too. If my team scores, I cheer in excitement -- even when the team is playing hundreds of miles away. The brain surely plays a role in each of these cases, but I would assign causality outside it.