The human brain is the most complex of all biological organs; it not only gives rise to consciousness—that most fascinating but elusive phenomenon—but also mediates our behavioural responses. The structure of the brain and its higher cognitive functions are the product of evolutionary history, embedded within the genome. One of the great scientific challenges today is therefore to integrate the results from two different lines of investigation into the biology of behaviour—using genes and the brain—with the goal of bringing both to a deeper level of understanding.
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