Are there any evidence suggesting that the more introvert people could be more subject to psychological problems?
Is possible to hypothesize that one of the causes is the lack of ideas in comparison with other people from the community?
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Several other disorders relate to introversion, including:
I would not expect lack of ideas to mediate these relationships. Introversion is sometimes thought to relate to "richer inner worlds" (can't recall where I read that, and I don't put a lot of stock in the claim). Introversion relates negatively to openness to experience, but seems to have a complex relationship with creativity. A common theory about introversion is that it relates to interest in reading (found some such evidence in Chinese adolescents so far; Lau & Cheung, 1988); this would certainly help with any lack of ideas.
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