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CATCHING the eye of someone beautiful triggers a flurry of activity deep in
the brain—a finding that may shed light on why first impressions last when
we meet new people.

Evidence is growing that in animals, a region of the brain called the ventral
striatum becomes active when the animal anticipates a reward of food. The same
region becomes active in drug addicts and compulsive gamblers when they are
about to indulge their habit.

Knut Kampe of University College London and his colleagues wondered whether a
social “reward”—the sight of an attractive face—would have the same
effect.…