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.


Please contribute to this project, if you have more information about this term feel free to edit this page



This page was last modified on 25 September 2008, at 05:32. This page has been accessed 140,906 times. 
What links here | Related changes | Permanent link