Illustration of a brain with colors indicating regions involved in social processes, plus three example faces used in social testing and a photo of a large group sitting in a circle.

Regions of the brain important to social processes, example stimuli used for social and feelings testing, and a large group sitting together. (Illustration of the brain with regions important to social processes highlighted & an illustration of three facial stimuli, courtesy of Elsevier, Inc., http://www.sciencedirect.com. Used with permission. Photo of people sitting in a circle courtesy of premasagar on Flickr, CC BY-NC.)

Illustration of the brain with regions important to social processes highlighted is courtesy of Elsevier, Inc., http://www.sciencedirect.com. Used with permission. Illustration of three facial stimuli is courtesy of Elsevier, Inc., http://www.sciencedirect.com. Used with permission. Photo of people sitting in a circle courtesy of premasagar on Flickr.