The theory that people fall under certain identity form of categories inside relation to physical properties possess intrigued several progressive psychologists also as their equivalents among the ancients. A few general categories of theories are thought right here, the humoral and the morphological.

Humoral ideas

Probably the oldest identity theory known try included in the cosmological writings of one's Greek philosopher and you can physiologist Empedocles plus associated speculations of your own medical practitioner Hippocrates. Empedocles' cosmic elements-heavens (featuring its relevant functions, moist and warm), earth (cool and deceased), flame (loving and you can dead), and liquids (cold and you will wet)-was in fact pertaining to health insurance and corresponded (on the above buy) so you're able to Hippocrates' bodily humours, that have been of this variations in attitude: bloodstream (sanguine temperament), black bile (melancholic), purple bile (choleric), and phlegm (phlegmatic). Which principle, having its see you to definitely body chemistry find attitude, enjoys endured in a few mode for more than dos,five hundred years.