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

brain are aroused more than others at
different times. Also, high arousal
levels in the brain don’t always correlate
with how aroused we feel. And
there are many different kinds of arousal:
arousal by loud music is not the
same as arousal by mortar fire, which is
not the same as arousal by presiding at
a meeting; you might be more sensitive
to one form of stimulation than to another.
It’s also too simple to say that we
always seek moderate levels of arousal:
excited fans at a soccer game crave hyperstimulation,
while people who visit
spas for relaxation treatments seek low
levels.
Still, more than a thousand studies
conducted by scientists worldwide have
tested Eysenck’s theory that cortical
arousal levels are an important clue to
the nature of introversion and extroversion,
and it appears to be what the
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