Law of Effect
A psychological principle, proposed by Edward Thorndike, that responses which produce a pleasant or satisfying result in a certain situation are more likely to occur again in the situation. Likewise, responses with an unpleasant or annoying effect are less likely to be repeated.
Example: If a hungry rat receives a food pellet after turning in a circle, he or she is more likely to turn in a circle again.
Grinnell, R. (2009). Law of Effect. Psych Central. Retrieved on April 18, 2015, from http://psychcentral.com/encyclopedia/2009/law-of-effect/