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" ... "...when it is asserted that such-and-such a part of the brain lights up in relation to a particular stimulus, this conclusion is arrived at by subtraction. Much more of the brain is already busy or lit up; all the scientist can observe is the additional activity associated with the stimulus. Minor changes noted diffusely are overlooked. Secondly, the additional activity can be identified only by a process of averaging the results of subtractions after the stimulus has been given repeatedly: variations in the response to successive stimuli are ironed out. Finally, and most importantly, the experiments look at the response to very simple stimuli – for example, a picture of the face of a loved one compared with that of the face of one who is not loved. But love is not like a response to a stimulus. It is not even a single enduring state, like being cold. It encompasses many things, including: not feeling in love at that moment; longing, indifference, delight; wanting to be kind, wanting to impress; worrying over the logistics of meetings; lust, awe, surprise, jealousy, anger; imagining conversations, events; imagining what the loved one is doing when one is not there; and so on. (The most sophisticated neural imaging, by the way, cannot distinguish between physical pain and the pain of social rejection: they seem to “light up” the same areas.) ... "
" ... “The cancer cells diffusely invade the brain—they wander all over the place like ants in the grass,” Holland said. “They’re recapitulating the behavior of cells during normal development." ... "