AP PSYCHOLOGY

Detailed explanation-1: -Galen elaborated on the role of the four humours in personal character and temperament. According to him, the material world was made up of four elements, viz. earth, air, fire, and water which combined to form four essential body fluids, viz. blood, black bile, yellow bile, and phlegm.

Detailed explanation-2: -Humoral theory, based on the work of the ancient Greek physician Galen, holds that good health relies on a balance of four fundamental fluids: blood, choler (yellow bile), phlegm, and black bile.

Detailed explanation-3: -According to Galen, the imbalance of pairs resulted in one of the four temperament categories (or personality types): sanguine (being optimistic and social), choleric (being short-tempered and irritable), melancholic (being analytical and quiet), and phlegmatic (being relaxed and peaceful).

Detailed explanation-4: -Galen and the theory of opposites Hippocrates suggested the theory of the four humours after carefully observing his patients. Galen developed Hippocrates’ ideas further. Galen believed that the humours could be balanced using the theory of opposites.

Detailed explanation-5: -460 BCE–370 BCE) is often credited with developing the theory of the four humors-blood, yellow bile, black bile, and phlegm-and their influence on the body and its emotions. His treatise on Airs, Waters, and Places describes the influence of geography on the body and its humoral makeup.