But Cheetah, I thought you were looking to see if you could define well-being as behaviors that lead to gene propagation?
The evolution of well being?
Evolution is fascination, damn it's so cool.
Nervous systems evolved because they enabled distant parts of the body to communicate and coordinate, enabling locomotion. Then sensors evolved, enabling responses tailored to conditions inside and outside the organism. Well-being is evolution's way of triggering the appropriate responses.
The most basic NSs had only two basic behaviors: towards and away, attract or repulse (feed / flight). Positive / negative.
If you look at something with a simple nervous system, like
C elegans, it's already more complex and most of the basics are there.
Their basic behavioral responses are:
(feed / breed) / (flight / fight)
IOW Positive / Negative
If everything is hunky-dory nematodes will indulge in repeated cycles of feed & breed / rest & digest.
They rest and digest because their well-being is at optimal levels, preparing to breed and feed. If their nervous system picks up internal signals of malnutrition, well-being is disturbed and appropriate behaviors trigger to restore well-being, they look for food.
It might be resting & digesting when its NS picks up clues from the environment of a potential mate. Suddenly what was perfect well-being is no more. Well-being becomes getting the girl or whatever.
If it senses a rival, it's well being is disturbed and it attempts to restore it by fighting it off, aggressive behaviors are triggered.
All the basics that became 'feelings' are there already:
Hungry/Satiated/Attract/Repulse/Aggressive/Horny/Content.
The basic (feed / breed) / (flight / fight) responses in simple NSs are present in all more complex animals. The NS has evolved and more bits got added on etc.
Nervous System:
Periferal + Central
Perfiferal = Autononic + Somatic
Autonomic = Parasympathetic + Sympathetic
Our Autonomic NS corresponds to that of the nematode, with the Parasympathetic NS taking care of the (feed & breed, rest & digest) bit and the Sympathetic with (fight / flight, attract / repel).
Well-being is sort of like an evolutionary road-map specifying which behaviors were successful in which situations. It's disturbance is the motivation that triggers the appropriate behaviour in the appropriate conditions, leading to the success of genes.