Cybernetic feedback is the process by which a system detects deviation from expected conditions and initiates self-correction. In the cybernetics tradition established by Norbert Wiener, feedback is not merely information about outcomes — it is the mechanism through which systems maintain stability or adapt. Negative feedback reduces deviation from a reference state (homeostasis: a thermostat holding temperature). Positive feedback amplifies deviation (growth, runaway collapse, speculative bubbles).
Wiener argued that information functions as a difference that makes a difference: systems respond not to content as such but to signal mismatch between expected and actual states. A feedback loop requires a sensor (detecting the current state), a comparator (measuring deviation from a reference), and an effector (acting to reduce or amplify the deviation). The loop is circular — output becomes input — and this circularity is what gives feedback systems their capacity for self-regulation without external command.
Feedback operates across timescales. A single system may contain nested feedback loops running at different speeds: fast loops handle immediate perturbations while slow loops adjust the reference states that fast loops defend. This layered structure means that what looks like noise at one timescale may be a correction at another.
emsenn analyzes the April 2025 tariff sequence in “Governing by confusion” as a cascading feedback process. Volatility was not noise but the system’s sensing behavior in action. The correction operated across multiple timescales — microseconds in financial markets, days in procurement, weeks in policy — each layer serving as a containment boundary for the last.
Related terms
- Requisite variety — the constraint on how much feedback a system can process
- Viable system model — organizational structure built on feedback channels
- Second-order cybernetics — feedback applied to the observer
- Cybernetics — the broader field