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Related Concept Videos

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Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
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Related Experiment Video

Updated: May 2, 2026

Control of Eating Behavior Using a Novel Feedback System
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A biopsychosocial model based on negative feedback and control.

Timothy A Carey1, Warren Mansell2, Sara J Tai2

  • 1Centre for Remote Health, a joint Centre of Flinders University and Charles Darwin University Alice Springs, NT, Australia ; Central Australian Mental Health Service, NT Department of Health and Families Alice Springs, NT, Australia.

Frontiers in Human Neuroscience
|March 12, 2014
PubMed
Summary

Negative feedback, explained by Perceptual Control Theory (PCT), offers a functional mechanism for the biopsychosocial model. This approach integrates physiological, psychological, and social variables for comprehensive understanding.

Keywords:
biopsychosocial modelcontrolcontrol systemmechanismnegative feedback

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Area of Science:

  • Integrative neuroscience and psychology
  • Systems biology and behavioral science

Background:

  • The biopsychosocial model lacks a unifying functional mechanism despite its intuitive appeal.
  • Existing research has not fully integrated biochemical, psychological, and social processes.
  • A robust, universally applicable mechanism is needed to bridge these domains.

Purpose of the Study:

  • To propose negative feedback, as described by Perceptual Control Theory (PCT), as the missing functional mechanism for the biopsychosocial model.
  • To outline PCT's embodied hierarchical neural architecture.
  • To demonstrate how PCT integrates physiological, psychological, and social variables.

Main Methods:

  • Review of Perceptual Control Theory (PCT) principles.
  • Explanation of negative feedback's role in PCT.
  • Description of PCT's hierarchical neural architecture for controlling variables.

Main Results:

  • PCT provides a functional, embodied, and hierarchical architecture.
  • Negative feedback is identified as the core mechanism controlling diverse variables.
  • PCT offers a unified framework for understanding the brain-behavior-environment interaction.

Conclusions:

  • Perceptual Control Theory (PCT) presents the first authentically biopsychosocial model in functional terms.
  • PCT's negative feedback mechanism integrates biological, psychological, and social research.
  • This framework has significant implications for advancing integrated research and practice.