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Maybe rather then 'free energy' there is a better term? How about "minimum energy machine" - the idea here being that what the brain does is to generate a model or simulation that tries to generate an internal state that exactly cancels out the incoming stimuli. What is used for error detection is something called "edge detection" which is a way to detect both movement and amount by comparing the input and the memory or simulation and then modifying the model/simulation so once again match the incoming.
This is interesting because all the biological/neurological processing each sense needs and vision has many different delays SO the model/simulation needs to run in the future, taking into account the various processing delays, so that in the moment the senses arrive they are greeted with their opposite to edge detect with.
the different senses have different worlds with the innermost being the body/brain which also controls muscles. this is divided into two parts - the pre and the active - and there is a time delay in between.
When the brain is generating a good and accurate TRANSFORM that accurately predicts the incoming stimulus then there is a minimum energy point and with edge detection and ml/ai networks this minimum is maintained and so the transform that the brain created is a model of the outside (and inside body/brain senses) that is constantly seeking to minimize energy - the energy necessary to match the outside stimulus that would overwhelm the brain - think of the problem of seizures.
and one can imagine that this type of processing - from the earliest of life - works long before there are eyes and ears as in the dark depths of the ocean there was still feeling and temperature sensing and the need to find and eat or consume the BMR required to maintain life......the internal feelings then being part of what the minimum energy brain must also minimize by using the transform/model/simulation......hence the feeling of hunger or being satiated.
and the above can and must be done at all levels of life, from the first beginnings of memory which is necessary to make a model or have a history from which to make choices.....and this type of communication/cooperation can be seen to arise out of things that want to flock or are drawn to each other and their own type of life......before sex......but then this would soon invent sex because it is an excellent way to produce the higher level model or species from the individuals.
there is an interesting podcast on the evolution of cooperation.........
flocking behavior only requires a couple of simple rules:
1. Get closer to your neighbor.
2. Do not hit or harm your neighbor
(and the flock arises - now lets add the reward)
3. watch a member or two of the flock thus formed that is NOT next to you, but maybe 7 or so away, and do what they do if they SURPRISE you by jumping outside the flock!!!!!
And from the above you now get automatically almost the protective value or reward of a flock.
Now add numbers based on food requirements for the flock. As the group grows in size and volume there are necessary tasks that must be accomplished and what happens next is "Division of Labor" because what is needed for the new superorganism is a way to feed and take care of the group which now provides ones living by taking up a specialty inside the colony.
And yes - recent research shows that all life - each having to grow from an egg - being feed even in an ant colony in the larva and pupa stage differently depending upon location - (what and what NOT is feed to them by the workers determines temperament/personality even though each has the same genes........
so the idea of adapting to lower energy requirements while staying alive does explain much else in life and life's development.....
....AND......evolution is nolonger an uphill process but is rather like a stream running down a littered hillside that breaks into tributaries as it descends, predictably getting better and better at getting the resources necessary to maintain the bodies order against entropy......
as a joke - or only partly so - life happens where the river empties into the ocean, where all the good stuff grows and all the animals drink and communication is best accomplished..
...that's why we get port cities!