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

is a child’s sensitivity to novelty in general,
not just to people.
High- and low-reactivity are probably
not the only biological routes to introversion
and extroversion. There are
plenty of introverts who do not have
the sensitivity of a classic high-reactive,
and a small percentage of high-reactives
grow up to be extroverts. Still,
Kagan’s decades-long series of discoveries
mark a dramatic breakthrough in
our understanding of these personality
styles—including the value judgments
we make. Extroverts are sometimes
credited with being “pro-social”—meaning
caring about others—and
introverts disparaged as
people who don’t like people. But the
reactions of the infants in Kagan’s tests
had nothing to do with people. These
babies were shouting (or not shouting)
over Q-tips. They were pumping their
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