| 1. | "persistence " and " extraversion ."
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| 2. | In Big Five studies, extraversion has been associated with surgency.
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| 3. | Eysenck proposed that extraversion was caused by variability in cortical arousal.
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| 4. | Together, this presents an optimistic view of what extraversion is.
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| 5. | Openness waned slightly for both sexes, as did extraversion in women.
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| 6. | Neuroticism and extraversion are the two most widely studied traits.
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| 7. | The preferences for extraversion and introversion are often called " attitudes ".
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| 8. | The functions are modified by two main extraversion and introversion.
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| 9. | Extraversion and introversion are typically viewed as a single continuum.
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| 10. | Researchers have found a correlation between extraversion and self-reported happiness.
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