You're right! The sibling comment does describe a behavior that is completely controlled by the autonomous part of the nervous system over which humans have lit

You're right! The sibling comment does describe a behavior that is completely controlled by the autonomous part of the nervous system over which humans have little to no conscious control or ability to override. Given that pretty much everything in the human body is linked to the nervous system in some manner, it's possible that there might not be a good reason to expect any kind of special feedback loop here.