What to know about what you don’t know you know. #1: Intuition is very efficient—if you don't overthink it.
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Social anxiety is not intrinsic to introversion, though I'd guess that significantly more introverts than extroverts suffer from it. If your wife's social anxiety related primarily to her being abused as a child, then it would be (at least relatively) independent of whether she was in- or extroverted.
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