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Information Feedback: From Linear Causality to Loop Thinking
PHIL003Lesson 19
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This lesson marks the shift from classical mechanics to modern systems theory. We must understand that,feedbackis not merely a simple energy return,in cybernetics, feedback is fundamentally information feedback. It signifies the evolution of human cognition from unidirectional, isolated linear causality (A causes B) to closed-loop, interactive loop thinking.

Linear Causality (Linear)Unidirectional, irreversibleABLoop Thinking (Loop)Information ChannelAB

Core Principles

  • Information Channel and Feedback: The realization of feedback relies on physical or logicalInformation Channel. It decodes the system's real-time output state and sends it back to the input. This closed-loop flow of information makesthe concept of feedback a fundamental scientific principle.
  • Paradigm Revolution: Loop thinking treats results as new starting points. Only by introducing feedback loops can we explain how systems continuously adjust their behavior through information differences to achieve dynamic stability amidst fluctuations.
  • Purposefulness: This shift breaks mechanical determinism. Feedback logic endows complex systems with intelligent characteristics, suggesting that 'effects' can participate in shaping 'causes'.
Deep Analogy: Arrow vs. Missile
An arrow’s trajectory after release is linearly determined by its initial velocity and cannot adapt to wind changes (linear thinking); whereas a guided missile captures deviations via sensors and usesInformation Channelreal-time feedback to the control system to adjust its fins, constantly reconfiguring causal chains during flight (loop thinking).