The Humours | Emotion and Disease

A few links of interest:

Emotion and Disease from the NIH

History of Mind, Medicine, and the Humors: http://www.nlm.nih.gov/exhibition/emotions/balance.html

PET scanning (from 2011, so a bit outdated):
http://www.nlm.nih.gov/exhibition/emotions/frontiers.html

The four elements, four qualities, four seasons:
http://wellcomelibrary.org/player/b11594846#0/0/-0.224,-0.0626,1.6351,0.7568