It's about arousal, not shyness
The classic account is baseline cortical arousal: introverts start closer to their optimal level, so additional stimulation becomes aversive faster, while extraverts start lower and seek stimulation to get there. Shyness — social fear — is a separate dimension entirely. Confident introverts and anxious extraverts both exist and are common.
- • Introversion is a preference for lower stimulation, not fear of people
- • Extraversion correlates with positive affect across studies
- • Acting out of character is possible but has a recovery cost
Free trait behaviour
People routinely act out of character for something they care about — the introverted teacher who is animated for three hours a day. Research on free traits finds this works well as long as it is followed by restorative niches. Skipping the recovery is what makes sustained out-of-character behaviour exhausting.
FAQ
Can you be both introvert and extrovert?
Yes — ambiverts sit near the middle of the continuum and make up the largest share of people.
Is introversion the same as shyness?
No. Introversion is about stimulation preference and where you get energy; shyness is social anxiety. They are separate dimensions.
Does extraversion change with age?
The social-vitality facet of extraversion tends to decline modestly through adulthood, while assertiveness often rises.
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