Originally Posted By ztrade
Pubmed has a study up which apparently was published in 2013.


Extraversion is a different word with a different meaning that extroversion.



Wrong. It is merely a variant spelling of extroversion. BTW I am most definitely introverted. Years ago introversion came up here and several voices stated that it was quite common with subs.

Which casts some doubt as to the reliability of this "research". I would suggest we take it with proverbial grain of salt and not get carried away applauding ourselves.