Positive feedback

2019-01-23

• It's getting bigger and bigger, and the rate of increase is accelerating.
  • [Positive feedback
  • Not to be confused with "positive feedback" in communication.
• Right figure, cases that become smaller and smaller, and the rate of decrease accelerates, are also "positive feedback" cases
  • Often misunderstood because of the mood of the word "positive"

• When a value deviates from a reference value, a force is applied that magnifies the deviation (= positive, in the same direction as the direction of the deviation)
• Therefore, both "accelerating in the direction of increasing" and "accelerating in the direction of decreasing" are positive feedback.

- What is negative feedback?

• Conversely, when a deviation from the reference value occurs, a force is applied in the direction to reduce the deviation.
• So, after a deviation due to disturbance, etc., the deviation decreases and returns to the original standard value.
• That is, negative feedback brings [stability

  • Some people make the mistake of thinking it's bad because of the word negative, but it doesn't correspond to good or evil.

  • positive return / [negative feedback

  • Howling (esp. audio feedback) is an example of Positive feedback.

  • The sound that comes in through the microphone is magnified and comes out through the speakers, which are then picked up again by the microphone, developing into a loud sound.

• Everything that is stable around us involves some form of negative feedback.
  • For example, body temperature
    • When the body temperature rises, sweat is produced on the body surface to cool down by vaporization heat to lower the temperature.
    • When the body temperature drops, the muscles quiver to produce heat and raise the temperature
    • homeostasis

relevance - echo chamber - the nail that sticks out gets hammered in - Stability is Depression

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