It is standard medicine that mental states can affect physical states. That's how placebos work—when sham drugs improve health, working by inducing the body to generate hormones. But some claim that the mind goes even further in healing the body, operating through consciousness in some nonphysical manner. Can this make sense?

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Rudolph Tanzi is a Professor of Neurology and holds the Joseph P. and Rose F. Kennedy Endowed Chair in Neurology and Mental Retardation at Harvard University. He is also the Director of the Genetics and Aging Research Unit at Massachusetts General Hospital.

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