1) Hunger trigger 
This image was created shortly after the house was completed, which occurred before 1923. It currently is in the public domain in the United States. ...
The mechanism in the brain (possibly in the hypothalamus) concerned with the appetite and control of food intake. ... Origin: appetite + G. Statos, standing ... (05 Mar 2000) ... 
(ap´ә-stat) a brain center (probably in the hypothalamus) concerned in controlling the appetite.
Type: Term Pronunciation: ap′e-stat Definitions: 1. The mechanism in the brain (possibly in the hypothalamus) concerned with the appetite and control of food intake.
a presumed region in the human brain, possibly the hypothalamus, that functions to adjust appetite.