Jack Nicholson's character Edward Cole in the movie The Bucket List said ...and never trust a fart, and a search for Al Roker leakage White House will clear up any doubts what that's all about.
How is the adult human body usually able to sense the difference between solid, liquid, and gas and enable the brain to consciously decide on the proper course of action? (e.g stay put, walk, or run!)
Per @theforestecologist's request I'll restate the question using my best "science words": How are adult humans able to determine when pressure in the rectum is the result of solid waste, liquid waste, or flatulence?
A search for answers has turned up the following:
In a rapid "sampling reflex," these nerves inform the brain about whether the rectal contents are intestinal gas or liquid or solid stoo...
However I can't view this link further.
Searching further for "sampling reflex" I've found this
- Sensing of the arrival of stool in the rectum with activation of the recto-anal inhibitory and sampling reflexes which allow stool to enter the anal canal and to be distinguished from flatus.
This provides an opportunity for sensation to take place, but does not describe how stool is distinguished from flatus, and doesn't even mention liquid.
At this point I'm way out of my depth.