4 answers
Carihttp://www.bbc.com/future/story/20130717-what-makes-someone-an-extrovert
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This is a great question.

I think that one is more nature than nurture. I feel like we are all born on a specific spot somewhere on the introversion/extroversion spectrum. We have a bit of leeway to move up or down, depending on the way we are treated...but if it was a lot, I'd be way more of an extrovert.

I really liked the article above. It doesn't answer your question - I'm not aware of any research on this - but it's an interesting read if you'd like to learn more about the biology of all this.
1 helpful
appvnNew on Jelly
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I really liked the article above. It doesn't answer your question - I'm not aware of any research on this - but it's an interesting read if you'd like to learn more about the biology of all this.
http://www.msrbuzz.com/pokemon-go-apk-download-gam…
Muhammadhttps://www.amazon.com/Immunity-Change-Potential-Organization-Leadership/dp/1422117367
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Regardless of whether it is caused by nature or nurture, if you don't like it, you can change it. Science says that it is possible to change almost everything you want about yourself, even if it might take you some effort. Read the first chapters of this book. I think it is revolutionary.
Chris2337 helpful answers
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I think it can be a bit of both. I think we are born with certain personality traits and then they can be developed by our enviornment. I think if someone is brought up by an outgoing large family, they wouldn't tend to be reclusive.