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According to this NYT story, it's already happening.
Measuring brand influence might seem like an unusual activity for a neuroscientist, but Montague is just one of a growing breed of researchers who are applying the methods of the neurology lab to the questions of the advertising world......the magic spot -- the medial prefrontal cortex. If that area is firing, a consumer isn't deliberating, he said: he's itching to buy. ''At that point, it's intuitive. You say: 'I'm going to do it. I want it.'
NT Times Story [nytimes.com]