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

doing all these early observations of infants,
and seeing that it wasn’t just
their social behavior that was different
in the extremes—everything about
these kids was different. Their eyes
dilated more widely when they were
solving problems, their vocal cords became
more tense while uttering words,
their heart rate patterns were unique:
there were all these channels that suggested
there was something different
physiologically about these kids. And I
think, in spite of this, because of his intellectual
heritage, he had the feeling
that environmental factors are so complex
that it would be really hard to pick
up that footprint of temperament later
in life.”
But Schwartz, who believes that he’s
a high-reactive himself and was drawing
partly on his own experience, had a
hunch that he’d find that footprint even
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