Really? Any examples besides nervous systems? I can see large feedback loops, with smaller loops inside, but that is not "control".
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Look up "systems biology". It's a mess in that there cell. Many cyclic dependencies may not be important, but hard to know which ones.
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Ok fair. Inside cooperating entities you expect a lot of control signals that create feedbacks, but not by "force". But in say ecosystems?
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"Feedback regulation" a view of some types of dynamical systems. Usefulness of view depends on degree to which there is "design intent".
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Systems theory may explain ecosystem dynamics even if they are not "under control". But +, - feedback well defined even in absence of goal
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-fb stabilizing, +fb destabilizing. We tend to observe ecological negative feedbacks b/c systems don't stick around in unstable states.
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Ecosystems have had major irreversible changes in attractor basins over geologic time. Photosynthesis, multicellularity, etc.
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We also often err in thinking systems are in equilibrium when they aren't just because change is slow on a human scale. Balance of nature?
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Equilibrium, balance and change are simplifications that result from our (somewhat inevitable) conceptualization of systems as things.
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Like waves are simplifications from conceptualizing energy redistribution in liquid? Or because they are actually patterns and math applies?
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Waves are not really simplified, but the predictive patterns you must use in the absence of full sampling of the liquid's state vector.
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