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

developed serious, careful personalities.
The low-reactive infants—the quiet
ones—were more likely to have become
relaxed and confident types. High and
low reactivity tended to correspond, in
other words, to introversion and extroversion.
As Kagan mused in his 1998
book, Galen’s Prophecy, “Carl Jung’s descriptions
of the introvert and extrovert,
written over seventy-five years
ago, apply with uncanny accuracy to a
proportion of our high- and low-reactive
adolescents.”
Kagan describes two of those adolescents—reserved
Tom and extroverted
Ralph—and the differences between the
two are striking. Tom, who was unusually
shy as a child, is good at school,
watchful and quiet, devoted to his girlfriend
and parents, prone to worry, and
loves learning on his own and thinking
about intellectual problems. He plans to
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