quiet-the-power-of-introverts-in-a-world-that-cant-stop-talking-susan-cain

We gaze reverently at the fMRI scanner,
which looks like a gleaming rocketship
lying on its side. Schwartz explains
that he asks his subjects—who
are in their late teens—to lie down with
their heads in the scanner while they
look at photographs of faces and the
machine tracks how their brains respond.
He’s especially interested in
activity in the amygdala—the same
powerful organ inside the brain that
Kagan found played such an important
role in shaping some introverts’ and extroverts’
personalities.
Schwartz is Kagan’s colleague and
protégé, and his work picks up just
where Kagan’s longitudinal studies of
personality left off. The infants Kagan
once categorized as high- and low-reactive
have now grown up, and
Schwartz is using the fMRI machine to
peer inside their brains. Kagan followed
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