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(10 Mar 2011 18:58 GMT) - A polite act shows respect. But a new study of a common etiquette - holding a door for someone - suggests that courtesy may have a more practical, though unconscious, shared motivation: to reduce the work for those involved. The research, by Joseph P. Santamaria and David A. Rosenbaum of Pennsylvania State University, is the first to combine two fields of study ordinarily considered unrelated: altruism and motor control. It is to be published in a forthcoming issue of Psychological Science, a journal of the Association for Psychological Science…
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