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Imagine evolution trying to design the perfect herding brain for shepherds, hunters, damn builders, walnut bankers and the variety of cooperating mammals.

It was, and is, a trade-off. It is easier to track the herd as an aggregate movement, but more useful to track my fellow herders locally. The balance chosen by evolution would have resulted in a natural signal to noise ratio that all mammals have, species dependent, in its ability to track the herd. Whenever mammals, in a herd, suddenly have that sinking feeling that they are lost from the herd, it is when that SNR ratio is outt of bounds. They would revert to more primitive organizations, like flocking, when the SNR was high. They would revert to more risk taking with their fellows locally when the SNR was low. Mammals are Kalman filters who monitor the variance in their state variables.

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