extraverts

Explanation 1: Either there are more extraverts than introverts in Chicago, or more extraverts volunteered to participate in the experiment (selection bias).

Since the world is dominated by extraverts who feel lonely whenever they are alone, it is not surprising that these two terms are often used interchangeably.

I don't mean to imply that introverts like movies and extraverts don't.

Such people should be understood and given the distance that allows them to work, not browbeaten into keeping up with the extraverts.

Yes, in prior jobs I've seen the extraverts and manipulators win, by use of their charisma over technical facts.

I suspect they are extraverts or high stimulation people that cannot grok introverts or low stimulation folks.

So I think extraverts love the opportunity to tell stories, even well-trod ones, whereas we introverts just abhor it.

Unlike extraverts, introverts are not often good starting simple conversation, and even when they do, they sometimes struggle internally thinking about what to say.

Well, celebrities are 0.00001% of humanity, and extraverts are about half of it, so I'd say Twitter is making progress.

Explanation 2: When it comes to deriving pleasure from short, shallow interaction with a random stranger, there's not much difference between extraverts and introverts.

To rebuild their energy, extraverts need breaks from time spent in reflection.

I think that's a much better model than people being extraverts OR(and only or) introverts.

Quoting from Pubmed (via nih.gov): "The present study compared the effects of caffeine on subjective arousal among introverts and extraverts....

When I read "We work hard and play hard," I see a company of extraverts who won't leave each other alone for the entire day.

The second part of your quote (which comes first) was previous research they were setting out to repeat, instead they conclude with "Results do not support the hypothesis that caffeine differentially affects extraverts and introverts".

"Do you enjoy being the center of attention?" Since everyone shares traits of introverts and extraverts, it's easy to take a test and read the vague description they give you and think "oh yeah that sounds like me."