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

About 20 percent cried lustily and
pumped their arms and legs. Kagan
called this group “high-reactive.” About
40 percent stayed quiet and placid,
moving their arms or legs occasionally,
but without all the dramatic limbpumping.
This group Kagan called
“low-reactive.” The remaining 40 percent
fell between these two extremes.
In a startlingly counterintuitive hypothesis,
Kagan predicted that it was the
infants in the high-reactive group—the
lusty arm-pumpers—who were most
likely to grow into quiet teenagers.
When they were two, four, seven,
and eleven years old, many of the children
returned to Kagan’s lab for followup
testing of their reactions to new
people and events. At the age of two,
the children met a lady wearing a gas
mask and a lab coat, a man dressed in a
clown costume, and a radio-controlled
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