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Positive feedback

Definition

noun

(1) A feedback in which the system responds to the perturbation in the same direction as the perturbation.

(2) A feedback mechanism resulting in the amplification or growth of the output signal.


Supplement

In this system, the original perturbation signal is amplified, and the output can grow exponentially or even hyperbolically.

A positive feedback is a closed system as it occurs in a feedback loop. It means the response of the system relies on the feedback signal to function.

One example of biological positive feedback is at the onset of contractions in childbirth. When contraction occurs, oxytocin is released into the body stimulating more contractions. Thus, the result is an increased amplitude and frequency of contractions.


Compare: negative feedback.
See also: feedback mechanism.


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Re: Is complexity inevitable?

... my emphasized quote below) A body like ours is full of negative and positive feedback loops and hundreds of thousands of complex interactions between structures from simple ...

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by wildfunguy
Thu Sep 26, 2013 6:12 pm
 
Forum: Evolution
Topic: Is complexity inevitable?
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Re:

... anything we have come up with. A body like ours is full of negative and positive feedback loops and hundreds of thousands of complex interactions between structures from simple ...

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by cakrit
Mon Aug 19, 2013 10:03 pm
 
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Positive feedback -- NOT homeostasis?

A number of synthetic and response mechanisms use positive feedback to amplify the system - that's part of overall homeostasis. If you focus on JUST that process, ...

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by Darby
Wed Oct 10, 2012 2:32 am
 
Forum: Physiology
Topic: Positive feedback -- NOT homeostasis?
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Positive feedback -- NOT homeostasis?

What you say makes sense. I'll be sure to ask him whether positive feedback is related to homeostasis in any way, or not. As well as present him with the books that ...

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by Triangular
Mon Oct 08, 2012 11:23 am
 
Forum: Physiology
Topic: Positive feedback -- NOT homeostasis?
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Positive feedback -- NOT homeostasis?

In a Physiology lecture, the professor asked us, "Who agrees that positive feedback is not a homeostatic mechanism?" He then asked the ones who did raise their hands ...

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by Triangular
Sun Oct 07, 2012 12:55 pm
 
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Topic: Positive feedback -- NOT homeostasis?
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