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

I’ve been puzzling over these questions
for my entire adult life. Fortunately,
so have researchers at Harvard,
where scientists are probing the
human brain in an attempt to discover
the biological origins of human
temperament.
One such scientist is an eighty-twoyear-old
man named Jerome Kagan,
one of the great developmental psychologists
of the twentieth century. Kagan
devoted his career to studying the emotional
and cognitive development of
children. In a series of groundbreaking
longitudinal studies, he followed children
from infancy through adolescence,
documenting their physiologies and
personalities along the way. Longitudinal
studies like these are time-consuming,
expensive, and therefore rare—but
when they pay off, as Kagan’s did, they
pay off big.
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