People, egocentric beings that we are, have long been interested in the working of our own minds. In ancient times the seat of intellect was believed to be the heart. Through accident and experience, it became apparent that the brain is where thought takes place. But how precisely, and where, exactly? Prior to the advent of modern neuroimaging techniques, brain function could be examined only post-mortem (of limited use to living humans) or haphazardly (head trauma to a particular location that results in impairment in certain brain function leads one to suspect a connection between the two).

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