Extraversion is the second dimension of the Big Five. Costa and McCrae (1992) describe it as "the disposition toward sociability, assertiveness, activity and the seeking of positive stimulation".
The six facets (NEO PI-R):
- E1 Warmth — interpersonal warmth, ease of connecting.
- E2 Gregariousness — preference for being with others vs. alone.
- E3 Assertiveness — ease in taking the floor and leading.
- E4 Activity — high pace of life, constant occupation.
- E5 Excitement-seeking — attraction to intense experiences.
- E6 Positive emotions — ease in feeling joy, enthusiasm.
Common confusions worth dismantling:
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"Introvert = shy". False. Introversion is preference for low-stimulation environments; shyness is social anxiety (facet N4). There are introverts without an ounce of shyness and extroverts paralyzed in front of an audience.
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"Extraversion makes you better at sales / leadership". The meta-analysis (Grant, 2013) found that ambiverts (middle scores) tend to outsell extreme extroverts: they don’t overwhelm the customer, they listen better.
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"It’s the opposite of intelligence". No relation. The correlation between E and general intelligence is essentially zero.
What is well established:
- E correlates positively with subjective wellbeing and positive affect (Lucas et al., 2008). Extroverts report being happier on average.
- E has a detectable biological base: introverts show higher baseline cortical activation (Eysenck’s hypothesis, refined by DeYoung et al., 2010), so they need less external stimulus to reach optimal arousal.
- Stability of E between ages 30 and 60 is high (~.75-.80).
In your Afini profile, E is reported as a percentile and broken down into its 6 facets. If your E is low it’s not a defect to fix; it’s information to design your week with fewer energy extractions and more recharging zones.