Introvert IQ: Are Introverts Smarter Than Extraverts?
Introvert IQ is the same as extravert IQ on average: a meta-analysis of over 110,000 people found a correlation of r = -.01 between extraversion and intelligence.
Dr. Russell T. WarneChief Scientist
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Introverts are not smarter than extraverts, and extraverts are not smarter than introverts. The largest meta-analysis of introvert IQ, covering more than 110,000 people, found a correlation of r = -.01 between extraversion and general intelligence, which works out to a fraction of one IQ point.
The idea that quiet people are the clever ones is popular online, and it has some real research behind it at the edges. Groups of very high scorers do tend to describe themselves as less sociable, and certain narrow parts of extraversion do relate to test scores in small ways. This page covers what the big meta-analyses show, where the "introverts are smarter" belief comes from, why test conditions may matter, and the confounds that make the picture look different from one sample to the next.
What the meta-analyses show
Introversion and extraversion are two ends of one personality dimension. In the Big Five model, extraversion covers sociability, assertiveness, activity level, excitement seeking and positive emotion. An introvert is simply someone who scores toward the low end of that scale; the label says nothing about shyness or anxiety, which are measured separately.
The best evidence on introvert IQ comes from two recent meta-analyses:
• Anglim and colleagues (2022): pooling 198 samples and 110,673 people, they found a correlation of r = -.01 between extraversion and general intelligence. The authors described it as "effectively zero". For comparison, openness to experience correlated about .20 with intelligence after correction for measurement error.
• Stanek and Ones (2023): in a synthesis of 3,543 meta-analyses drawing on data from millions of people, global extraversion correlated -.02 with general mental ability. They concluded that extraversion as a whole is negligibly related to cognitive abilities.
Older meta-analyses agree. As summarised by Fries and colleagues, Ackerman and Heggestad's 1997 review reported r = .08, and Wolf and Ackerman's 2005 meta-analysis reported r = -.04. Across nearly three decades of data, the estimates sit within a few hundredths of zero, sometimes slightly positive and sometimes slightly negative.
To put an r of -.01 on the IQ scale, multiply it by the standard deviation of 15 points. Someone one standard deviation more introverted than average would be expected to score about 0.15 of an IQ point higher. That is far smaller than the measurement error on any single test score, so knowing whether someone is an introvert tells you essentially nothing about their IQ.
Where small effects do show up
The overall null hides a few modest patterns at the level of facets, the narrower traits that make up extraversion.
• Gregariousness: in the Anglim meta-analysis, liking crowds and group activity correlated -.08 with general intelligence. That is about 1.2 IQ points per standard deviation of gregariousness, a small effect that leans in the introverts' favour.
• Assertiveness and activity: these facets ran slightly positive. Stanek and Ones found that the activity facet, a tendency to be energetic and busy, correlated .23 with general mental ability, one of the larger personality links in their whole dataset.
• Crystallized versus fluid ability: extraversion correlated -.04 with crystallized intelligence (knowledge and vocabulary) and essentially zero with fluid reasoning in the Anglim data. One reading is that people who spend less time socialising may spend a little more time reading, but the effect is tiny.
Because the facets point in opposite directions, they cancel out when everything is rolled into a single extraversion score. A quiet person who is also energetic and assertive, or a sociable person who prefers one-on-one conversation, does not fit the simple "introverts are smarter" story either way.
The personality trait that does track intelligence is openness, especially its intellectual curiosity component. That relationship, and how it plays out among gifted people, is covered in our article on high giftedness and personality.
Why people believe introverts are smarter
Several things make the claim feel true even though the general-population data do not support it.
The first is evidence from high-IQ groups. In a preregistered study, Fries and colleagues compared 617 adult members of Mensa with three reference samples totalling 112,637 people. Mensa members scored lower on extraversion than every comparison group, with effect sizes from d = -0.25 to d = -0.65, and the biggest gap was on sociability. That looks like strong support for the idea, but there are two catches. The Mensa sample was older on average (about 48 years against 21 to 37 in the comparison groups), and extraversion tends to drift down with age. The authors also noted that a three-level meta-analysis of gifted versus non-gifted people by Ogurlu and Özbey, pooling 13 studies, found no significant difference in extraversion. People who choose to join a high-IQ society are a self-selected group, and they may differ from equally able people who never sign up.
The second is a confusion between introversion and other traits. Shyness, social anxiety and a preference for solitude often get lumped together under "introvert" online. Neuroticism has a small negative correlation with intelligence (about -.09 in the Anglim data), so if anything the anxious end of that mix runs the other way. Our page on IQ and anxiety looks at that link separately.
The third is stereotype. Fictional geniuses are often portrayed as solitary, and a quiet person who speaks rarely can seem thoughtful. Impressions like these are not measurements.
Does test-taking style matter?
There is an older line of research suggesting introverts and extraverts approach tests differently even when their underlying ability is the same. Hans Eysenck's arousal theory proposed that extraverts work best under stimulation and speed, while introverts work best in quiet, low-pressure conditions. Anglim and colleagues summarise this literature as showing extraverts doing better on timed tasks and introverts doing better on tasks requiring reflection, citing a study by Rawlings and Carnie that compared Wechsler subtests given with and without time limits.
Stanek and Ones also found small positive relations between extraversion and retrieval fluency, the speed of pulling words or ideas from memory. Fluency tasks reward rapid output, which may suit people who are comfortable thinking aloud.
These effects are small, and they cut both ways. A well-built IQ test samples many kinds of items, some speeded and some not, so a modest style advantage on one subtest has little effect on the overall score. If you are an introvert who freezes under a clock, that is worth knowing about yourself. It says little about your reasoning ability.
Confounds to keep in mind
When a single study does find introverts or extraverts ahead, the result usually depends on who was sampled and how.
• Age: extraversion declines slightly across adulthood, while crystallized knowledge rises for decades. A sample with a wide age range can produce a spurious link between the two.
• Selection: university students, Mensa members and online volunteers are not representative. Each of these groups is filtered on ability, personality or both.
• Measurement: different inventories define extraversion differently. In the HEXACO model, for instance, some traits that the Big Five places under extraversion are counted elsewhere, which Fries and colleagues suggested could explain why their result differed from earlier meta-analyses.
• Education and occupation: some jobs reward sociability and others reward solitary focus, so comparing professions blends personality with career choice.
The large meta-analyses average across all of these differences, which is why their near-zero estimates are more trustworthy than any one striking study.
Frequently asked questions
Do introverts have a higher IQ?
No. Large meta-analyses find a correlation of about zero between extraversion and intelligence, equivalent to a fraction of one IQ point.
What is the average introvert IQ?
About 100, the same as everyone else. Average IQ does not differ meaningfully between introverts and extraverts.
Are gifted people more likely to be introverts?
One study of Mensa members found lower extraversion than in the general population, but a meta-analysis of gifted versus non-gifted people found no significant difference. Self-selection and age may explain the Mensa result.
Which personality trait is most linked to IQ?
Openness to experience, especially intellectual curiosity, with a correlation of about .20. Neuroticism shows a small negative correlation of about -.09.
Do introverts do worse on timed tests?
Some older studies suggest extraverts do slightly better under time pressure and introverts on reflective tasks, but these style effects are small and have little impact on a full-length test score.
The takeaway
Introvert IQ is, on average, the same as extravert IQ. Meta-analyses of more than 100,000 people put the correlation within a few hundredths of zero, and the small facet-level effects pull in opposite directions. Being quiet, sociable, reserved or outgoing says very little about how well you reason. If you want to know where your own ability stands, take the RIOT IQ test rather than guessing from your personality type.
References
1. Anglim, J., Dunlop, P. D., Wee, S., Horwood, S., Wood, J. K., & Marty, A. (2022). Personality and intelligence: A meta-analysis. Psychological Bulletin, 148(5-6), 301-336. [doi.org/10.1037/bul0000373](. doi.org
2. Stanek, K. C., & Ones, D. S. (2023). Meta-analytic relations between personality and cognitive ability. Proceedings of the National Academy of Sciences, 120(23), e2212794120. [doi.org/10.1073/pnas.2212794120](. doi.org
3. Ackerman, P. L., & Heggestad, E. D. (1997). Intelligence, personality, and interests: Evidence for overlapping traits. Psychological Bulletin, 121(2), 219-245. [doi.org/10.1037/0033-2909.121.2.219](. doi.org
4. Wolf, M. B., & Ackerman, P. L. (2005). Extraversion and intelligence: A meta-analytic investigation. Personality and Individual Differences, 39(3), 531-542. [doi.org/10.1016/j.paid.2005.02.020](. doi.org
5. Fries, J., Kovacs, K., Zeilinger, E. L., & Pietschnig, J. (2022). Is there a "gifted personality"? Initial evidence for differences between MENSA and general population members in the HEXACO personality inventory. Journal of Intelligence, 10(4), 92. [doi.org/10.3390/jintelligence10040092](. doi.org
6. Ogurlu, U., & Özbey, A. (2022). Personality differences in gifted versus non-gifted individuals: A three-level meta-analysis. High Ability Studies, 33(2), 227-251. [doi.org/10.1080/13598139.2021.1985438](. doi.org
7. Rawlings, D., & Carnie, D. (1989). The interaction of EPQ extraversion with WAIS subtest performance under timed and untimed conditions. Personality and Individual Differences, 10(4), 453-458. [doi.org/10.1016/0191-8869%2889%2990009-3](. doi.org
Hero image: Cozy reading corner, by Shixart1985, CC BY 2.0. Via Wikimedia Commons.
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