One introvert who can relate to Cain's campaign is Mark Dykeman, an IT business analyst from Canada.
Despite her eccentricities, she was no introvert, was a lively presence on various online sites and game worlds.
She loves cats and lizards, spend her free time making costumes, and am a bit of an introvert at heart.
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Long, who says she's "kind of an introvert, " hasn't owned a television set since the September 11, 2001, terrorist attacks.
Larry Page is said to be an introvert who dislikes public speaking.
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But in the New York Times, introvert author Judith Warner argues that a "more quiet argument" would have been much more effective.
So, as an introvert, how can you let people know that you have leadership capabilities and not get overshadowed by your louder, more gregarious colleagues?
The 42-year-old, who has written a number of blogs on introversion, agrees there are plus points to being an introvert, but says it can be difficult.
Being an introvert meant that I would spend a lot of time thinking about what I should do, but also plotting and planning how I would get ahead.
The terms extrovert and introvert are well known in business.
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Her book, which hopes to rehabilitate the introvert, has struck a chord with readers and sparked a debate among commentators and armchair psychologists, while her TED talk has been watched by 1.5 million viewers.
Psychologists brought in by teams will sift through a player's answers and try to decipher trends to help explain how he learns best (say, through written vs. verbal instructions) or is an introvert or extrovert.
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Corporate trainer Michelle Kruse says that as an introvert, she used to look down at her notes during meetings, or "hang out by the food" at social gatherings, partly because she felt uncomfortable making eye contact.
Meanwhile the Guardian's Jon Ronson is bemused that after concluding his whole family are ambiverts - which Cain defines as a mixture of extrovert and introvert - the group barely gets a mention in the book.
Masao Homma, vice-chancellor of Ritsumeikan University in Japan, thinks an influx of foreign students could help his country's campuses: in a homogeneous land which in his view is growing even more introvert such exchanges could expose Japan's young to the wider world.
Is your brand an introvert standing away from the dance floor too shy to ask for a dance or does your brand have the confidence to walk up to the bar and introduce itself to the most gorgeous person standing there.
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