Coons E E, Levak M, Miller N E
Science. 1965 Dec 3;150(3701):1320-1. doi: 10.1126/science.150.3701.1320.
Stimulation of the lateral hypothalamus, which induces eating, resembles hunger in that it motivates rats to learn, for food reward, a response of pressing a bar. The response is discriminatively confined to only a bar that delivers food on either a 100-percent or a partial schedule of reinforceinent. This discriminative responding can be transferred to hunger that is normally induced by deprivation of food.