The relationship between biology and psychology has never been as simple as the debate about it would imply. Both sides of the “nature/nurture” argument are wrong. The problem stems from framing the debate as if the influence of biology goes only one way—up, from our bodies to our minds. New research shows that the relationship between brain and mind runs in both directions. It has long been accepted that changes in our biochemistry, caused by illness, medication, or intoxicants, can effect our psychological states. But what has been less appreciated, until recently, is that changes affecting
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