Introverts' brains show higher levels of cortical arousal than extroverts. This means their brains are already over-stimulated.
“Introverts seem to be born with a level of arousal that is higher than average,” said Carducci. “This is why they prefer not to be around loud noises and big parties.”
And, introverts have higher heart rates and EEG rates that indicate excitement, said Barry Smith, professor emeritus and director of the Laboratories of Human Psycholophysiology at the University of Maryland.
“One reason that introverts tend to avoid a lot of social stimulation is because they are already aroused,” he said. “They have less social needs.”
“The vast majority of the population is neither an introvert or extrovert. They are ambiverts,” said Smith.
Ambiverts display characteristics of both introversion and extraversion and Smith suspects that most people fall into this category. And, introversion remains situational for many.
“We all find ourselves on some point of the continuum. We will find ourselves needing solitary time and [needing] people,” said Maidenberg.
What’s more, Smith said, the difference between an introvert and an ambivert remains small.
“A person who is introverted is only about 10 percent more introverted than average,” he said.
3. Introverts know how to make small talk.
At a party both an introvert and a shy person might stand against the wall —but their reasons differ. Shy people don’t understand how to talk to people and fear what might happen if they do open up.
“These people avoid social interaction because they are fearful of being judged,” said Maidenberg.
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