In this paper we outline the working model of PCT and explain how PCT provides an embodied hierarchical neural architecture that utilizes negative feedback to control physiological, psychological, and social variables. Thus, PCT may be the first biopsychosocial model to be articulated in functional terms. Perceptual Control Theory (PCT) describes the way in which negative feedback establishes control at increasing levels of perceptual complexity. Moreover, negative feedback is purported to also govern the activity of all other organisms as well as humans. Negative feedback has been implicated in the regulation of neurotransmitters as well as important psychological and social processes such as emotional regulation and the relationship between a psychotherapist and a client. Negative feedback may be the mechanism that is required. What is needed is a robust mechanism that is equally important to biochemical processes as it is to psychological and social processes. One reason for this might be the absence of an identified mechanism or a functional architecture that is authentically biopsychosocial. Although the biopsychosocial model has been a popular topic of discussion for over four decades it has not had the traction in fields of research that might be expected of such an intuitively appealing idea.
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