id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
en-wikipedia-org-1400		Evolution of emotion - Wikipedia			.html	text/html	3291	540	52	Evolution and natural selection has been applied to the study of human communication, mainly by Charles Darwin in his 1872 work, The Expression of the Emotions in Man and Animals.[1] Darwin researched the expression of emotions in an effort to support his theory of evolution. The ideas found in his book on universality of emotions were intended to go against Sir Charles Bell's 1844 claim[3] that human facial muscles were created to give them the unique ability to express emotions.[2] The main purpose of Darwin's work was to support the theory of evolution by demonstrating that emotions in humans and other animals are similar. Robert Zajonc, a University of Michigan psychologist, published two reviews in 1989 of the "facial efference theory of emotion", also known as facial feedback theory,[7][8] which he had first introduced to the scientific literature in an article published in Science in 1985.[9] This theory proposes that the facial musculature of mammals can control the temperature of the base of the brain (in particular the hypothalamus) by varying the degree of forward and backward flow through a vascular network (a so-called rete mirabile).	./cache/en-wikipedia-org-1400.html	./txt/en-wikipedia-org-1400.txt