AP PSYCHOLOGY

Detailed explanation-1: -Cannon and Washburn (as cited in Coon, 1995) came up with the stomach contraction theory which states that we know we are hungry when our stomach contracts. In the notorious balloon study, Washburn trained himself to swallow a balloon which was attached to a tube, then the balloon was inflated inside of his stomach.

Detailed explanation-2: -During hunger, the muscle of the stomach and small intestine is largely quiescent. However, a regular cycle of contractions play a “housekeeping” role prior to the next meal and may contribute toward the development of hunger.

Detailed explanation-3: -Hormones. The physical sensation of hunger comes from contractions of the stomach muscles. These contractions are believed to be triggered by high concentrations of the hormone ghrelin. Two other hormones, peptide YY and leptin, cause the physical sensations of being full.

Detailed explanation-4: -As predicted, Washburn did feel hungry when his stomach contracted, leading them to conclude that hunger was no more than the rumbling contraction of an empty stomach.

Detailed explanation-5: -These are commonly known as hunger pangs. Hunger pangs, or hunger pains, are caused by strong contractions of the stomach when it’s empty. This uncomfortable sensation is often accompanied by hunger, or the desire to eat. Despite being called “hunger” pangs, these pains don’t always indicate a true need to eat.