Satiation of hunger from food injected directly into the stomach versus food ingested by mouth.

Abstract

Measuring hunger drive as a function of the rate of instrumental panel-pushing, deprived rats with stomach fistula were given liquid food by mouth and by direct injection prior to response testing. Saline was used as a control substance. Significant decrements in response followed both types of feeding, the reduction being significantly more for mouth than for stomach feeding. It is concluded that "drive reduction can occur in the absence of need reduction." (PsycINFO Database Record (c) 2006 APA, all rights reserved)