COMPARE positive feedback and negative feeedbackALSO see John"s notes from his talk The Tragedy of the Thermostat

The world is complex và mystifying -but...

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Billiard tableMother & child

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NOT ALL SITUATIONS make it evident that a particular kích hoạt has affected another one. Sometimes there seems to lớn be a clear chain of subsequent actions (as in billiards). When this chain sends information back to the "initial" process we gọi it "feedback". Although many working systems in nature may be subject lớn feedback, the way this happens is not always visible or simple. When you look at a set of interconnected things you begin khổng lồ see them as a whole system that appears khổng lồ affect itself. Ross Ashby used the term circularity of action, because it would seem that something is changing itself - or even creating itself.

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Technological origins

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Photo of an electronic circuitDrawing of actual actual circuit

The term "feedback" emerged from within the emerging field of radio and electronics, which tended to have visible wires & clear information pathways that made feedback easy khổng lồ identify và measure.

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Amplifier with feedbackFeedback diagram

FEEDBACK TAKES TIME: It is important to lớn remember that feedback takes time lớn take effect. In the feedback diagram (above right), for example, P sends information to lớn R, which then replies with new information. This means that the state of P will alter, after it has sent its information. But not all feedback has the same effect - while some works lớn affirm the information sent out (i.e. Called POSITIVE FEEDBACK), other feedback has the opposite effect (i.e. NEGATIVE FEEDBACK). N.B. Positive just means REINFORCING: There are no value judgements implied by the adjectives "positive" or "negative" when used with the word . They merely specify whether the feedback reinforces (i.e. In positive feedback) or moderates the original process (as in negative feedback).


See also positive feeedback | negative feeedback | autopoiesis | sympoiesisReturn lớn glossaryReturn lớn home