inControl ep38 - inControl guide to ... Feedback
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Nov 17, 2025 Discover the fascinating anatomy of feedback loops and their historical origins, from ancient water clocks to modern AI dynamics. Explore the contrasting roles of negative versus positive feedback in biology, economics, and game design. Learn how feedback impacts stability, causality, and the very arrow of time. Delve into adaptive control and the implications of reinforcement learning in today's technology. Reflect on feedback as a learning tool that shapes our understanding of systems, both natural and artificial.
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Negative Versus Positive Feedback Roles
- Negative feedback tends to stabilize and correct errors while positive feedback reinforces and can destabilize.
- Systems often combine both to maintain sensitivity yet enable decisive switching when needed.
Feedback Blurs Causality And Time
- Closing feedback loops blurs input-output causality and challenges input-output modeling conventions.
- Causality is a modeling choice and feedback reveals directionality linked to the arrow of time.
Loop Gain Trades Aggression For Risk
- Loop gain is the product of controller, plant, and sensor gains and sets how aggressively errors are corrected.
- High loop gain improves disturbance rejection but increases risk of instability from delays and phase lag.
