Having recently come from a holiday with my family where most of them are highly extroverted it kind of occurred to me what the main difference between the two is.
I have noticed when I am in a large group or in particular, with a strong extrovert, my brain shuts down. Ive seen alot of other introverts report this aswell. If you google search this topic you will also find similar testimonials, of introverts being unable to speak/think in the presence of ( strong ) extroverts. On these googled websites they will tell you some pseudoscience rubbish that introverts are "sensitive" to dopamine. And that too much dopamine "shuts" your brain down.
Here's what I think is happening......
If we remember from sapolsky's texts, dopamine is involved in the "pursuit of reward". Even better, I think its fairer to say that dopamine is a "do it" and "action/reaction" driving neurotransmitter.
When an organism receives a stimulus from the environment, the magnitude of the dopamine spike in response to that stimulus determines the magnitude of the reaction that the organism makes to that stimulus.
So, the problem with introverts is that the random small talk bullshit that extroverts like to spew forth doesn't cause a dopamine spike in an introverts brain, and thus the response from the introvert is either very short/breif/dull/boring.
Its not that your introverted brain is "shutdown". Its that the pointless banter of the extrovert doesn't stimulant it.
Its not that introverts are "boring", but rather Introverts like to talk about stuff that interests them, stuff that is meaningful, has logical purpose, is relevant to our survival, or conducive to success and improved quality of life. That is what they dopamine spike to.
If you as an extrovert ask me a question to which I return a vacant blank stare and dull short response, its because im too polite to say "stfu , im not interested in that irrelevant shit"
There is no willpower, or conscious thought, involved in dopamine spikes, they are completely involuntary responses, and so your instinctual urge of how to respond is also pre-programmed and involuntary. "boring" or "dull" has nothing to do with it.
Another problem with introverts is there brains are less likely to retain information that is not helpful for their survival or future success. This is an additional reason why small talk with introverts is hard because they dont care to remember WORTHLESS fucking details.