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Signals, Sensations, Perceptions, Commands, Actions!
In humans, the sensors are the eyes, ears, nose, skin, and taste buds. The processor/memory/controller combo is the brain. The actuators are the muscles. Although not shown on the diagram, “commands” are also issued to the sensors. All inter-part communications “In Here” are manifested via neural currents.
Of course, this crap is all made up. It’s simply a cacophonous dump of what was in my tortured mind at the moment.
Categories: miscellaneous
Actuator, Control system, perception, sensor
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Bulldozer00's Blog 
Don’t knock it Tony! I thought it was excellent :-). I love it when a picture says a thousand words.
Thx Lorraine š
There are other, tighter control loops in there too. For example, the loop you show (presuming it is the one with conscious control) is duplicated at lower levels with shorter nerve runs in more primitive parts of the nervous system such that reactions can be faster; example, pulling your hand out of a fire, or jumping back when a tiger attacks. Especially for these there is a ‘single’ command that stimulates a portion of the brain or nervous system directly, carrying out co-ordinated action without any higher-level mechanism saying ‘ok, you did that, now do this’.
This is also how muscle-memory works, where you can ‘bundle’ learned responses to be triggered from a single stimulus.
Yes, we are each a stack of hierarchically structured control systems. The lower levels are fast-acting, autonomous. The higher levels are slow-acting and driven by conscious decision making. Bill Powers has the best model of how we, and any other, living thing ticks: http://wp.me/psQTe-6do