It’s usually not the brain urging us to do these things but some other part of the nervous system.
When it is the brain, it’s different parts of the brain operating independently. (After all, the brain is just “part of the nervous system” anyway.)
It sounds like you have the idea that the brain is kind of one big thing that operates as a cohesive unit, but that’s not it at all. The brain has all these different parts doing different things, and a lot of the time they’re interacting and moderating each other, and sometimes they all agree on stuff, but that’s usually in emergency mode like fight or flight. Most of the time, your brain is a bunch of parts just loosely coupled but doing things largely independently of one another.
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