Scaling Limit - Energy. Neurons take a lot of energy.
Back to our worm, he needs a neuron. These are cells that go 'ballistic' when agitated. They have an unstable charge arrangement. Add just a few electrons, and more are shed, down in a wave that resembles a copper wire, but not the same.
Neurons and brain cells are almost the same. A neuron needs a sheath or tube to confine it to be long, and I don't really know what came first. They also have their little buds or axioms, that can initiate a charge run, or are charged by it.
The worm picks up a neuron that runs its length. This helps it immensely to know when something is chomping on its butt. Obviously, evolution provides more. The worm is generating a current at the head to know which way is which. All these neurons grow to the head, and then stop. They are workaholics and have to do something, so all these creatures develop a nerve tangle at the head. This is our first brain, and it the main reason we exist.
Tied at the top, they develop sensors, and training, so that when a big dark thing hovers overhead, they scoot. (again, another million years)
Just as molybdenum controlled the first life, neurons define the meaning of 'animal'. And a nerve tangle defines a 'brain'.
How the tangle works now presents other scaling limits. It all the same with Arties, where the tangle is formed from chips. Plants can develop reactions, but it is a broader charge cascade, like the Venus fly trap, and not neurons.
- to be continued - too dang hot.
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