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Does evolution explain why the human brain supports religious belief? Dimitrios Kapogiannis and Jordan Grafman, scientists at the National Institutes of Health, follow up on a recent scientific paper by stating that brain networks that evolved for other purposes have given rise to our capacity for religious belief and experience. Andrew Newberg, the radiologist and psychiatrist who wrote How God Changes Your Brain, takes a different approach. He argues that the brain may be an instrument of religious experience but is not necessarily the origin of that experience. Each side of the debate first wrote a position statement; the sides then exchanged statements and wrote rejoinders.

"Generally, positive mood has been found to enhance creative problem solving and flexible yet careful thinking," says Ruby Nadler, a graduate student at the University of Western Ontario.