"Introverts are generally more sensitive to low-intensity stimuli - they are mentally alerted to inputs that extroverts may miss."

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We're told that to be great is to be bold, to be happy is to be sociable. We see ourselves as a nation of extroverts - which means that we've lost sight of who we really are. Depending on which study you consult, one third to one half of Americans are introverts - in other words, one out of every two or three people you know.

— Susan Cain