Self-reinforcement
Positive feedback (exacerbating feedback, self-reinforcing feedback) is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance. That is, the effects of a perturbation on a system include an increase in the magnitude of the perturbation. That is, ''A produces more of B which in turn produces more of A''.Keesing, R.M. (1981). Cultural anthropology: A contemporary perspective (2nd ed.) p.149. Sydney: Holt, Rinehard & Winston, Inc. In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback. Both concepts play an important role in science and engineering, including biology, chemistry, and cybernetics. Mathematically, positive feedback is defined as a positive loop gain around a closed loop of cause and effect. That is, positive feedback is in phase with the input, in the sense that it adds to make the input larger. Positive feedback tends to cause system instability. When the loop gain is pos ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Stampede Loop
A stampede () is a situation in which a group of large animals suddenly start running in the same direction, especially because they are excited or frightened. Non-human species associated with stampede behavior include zebras, cattle, elephants, reindeer, sheep, pigs, goats, blue wildebeests, walruses, wild horses, and rhinoceroses. Some media sources refer to situations in which people were injured or have died due to compression in very dense crowds as a "stampede", but this is a misnomer; the more appropriate term would be crush, or crowd collapse.

Cattle stampedes

Anything unusual may start a stampede among cattle. Especially at night, things such as lighting a match, someone ju ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]