In my attempt to learn a bit more about the brain, I learned about it’s power, which includes automatic reactions. A green example is blinking; we don’t think about doing it, we just automatically do it.
I guess another example, but to lesser extent is breathing. In breathing , we need oxygen to function, so it does have the biological aspect. But again, we don’t think that we are breathing, we just do it.
It’s only brought to our attention when we think about it, & when it’s out the norm, do we focus on it, for example when we yawn. Yawning, what I’ve been told, is your brain tries to get more oxygen. So I guess it’s just glorified breathing.