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<p>* <a href="page.php?w=Perceptual_control_theory">Perceptual control theory</a>: A model of behavior based on the properties of negative feedback (cybernetic) control loops. A key insight of perceptual control theory (PCT) is that the controlled variable is not the output of the system (the behavioral actions), but its input, "perception". The theory came to be known as "perceptual control theory" to distinguish from those control theorists that assert or assume that it is the system's output that is controlled. <a href="page.php?w=Method_of_levels">Method of levels</a></p><p>
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