Galen's Theory Of Dualism

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The theory of animal spirits came from Alexandrian physicians in 3rd century BCE and prevailed for over a thousand years before the discovery of electrochemistry disproved this belief. The animal spirit theory was the idea that the liver produced “natural spirits” that flowed through the heart, arteries, and brain until they met oxygen and became animal spirits. These spirits were thought to flow through nerves in order to force movement or carry sensory impressions. Important and well known scientists all over the world promoted this theory and added on their own advancements in the discovery. Galen popularized the four humours: blood, phlegm, yellow bile, and black bile. Descartes used this theory to develop his idea of dualism. Both of these

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