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I can't find one on Google Images.

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Extraversion and IQ typically have zero correlation. In Bates and Rock (2004),we suggested that if the arousal value of the testing environment varies, this might induce a modest correlation with IQ (introverts doing best in silences, ambiverts with some noicse, and extraverts performing best under fairly loud white noise background. More basic measures like inspection time were unaffected.

Extraversion*Arousal interaction effect on IQ scores

Based on some followup queries, here's a graph of Extraversion against IQ-score in 597 adults from a normative sample in the United States: The MIDUS.

The plot shows the raw data points, and also a loess best fit curve: no relationship, even at the extremes.

enter image description here

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    $\begingroup$ But how can that be? 75% of people above a certain IQ are introverted and there are so many stupid extroverts in the world. Sociability peaks at about 85 IQ I've heard. Where are the people that balance these people out? This doesn't seem to be a case of simple linear tendency. $\endgroup$ – user8684 Jun 28 '15 at 23:02
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    $\begingroup$ What's the correlation with people below 70 IQ excluded? (the mentally challenged) $\endgroup$ – user8684 Jun 28 '15 at 23:04
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    $\begingroup$ It's not the case that "75% of people above a certain IQ are introverted". I can post some data if people would find it helpful, but the population correlation is near zero. It's also not the case that extraverts are "stupid", nor that sociability peaks at about 85. Regarding what would happen excluding people with IQ<70. Not a lot. Barely 2% of the population in a country like, say, Canada, score that low or lower.. $\endgroup$ – tim Jun 28 '15 at 23:06
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    $\begingroup$ Well I've found this: (bottom of page 3) eric.ed.gov/?id=ED428473 and this tandfonline.com/doi/pdf/10.1300/J274v18n03_08 So, people over 130 are a small part of the population too. If it quickly becomes introverted very roughly there then the correlation could still be near zero. Isn't a symmetric V a zero correlation too? Not that that's my proposed shape, I have no idea what the graph would look like. Yes, very high IQ extroverts exist. $\endgroup$ – user8684 Jun 29 '15 at 0:20
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    $\begingroup$ (continued) But I find equal I:E percent distributions from Einstein to "retard" hard to believe. Are you saying that it'd look like random dots of subjects covering the whole square? (and when I called some of the world's extroverts "stupid", I should've said low IQ, obviously their social skills could be genius level). Also, if you're an extrovert, you shouldn't feel bad if this is true, if that's the case then high social skills people with advanced degrees would be uncommonly able and get paid more. $\endgroup$ – user8684 Jun 29 '15 at 0:20

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