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I guess the former was expected, while this was a surprise.

Also being a Democrat or a Republican is not a biological trait, and it is strongly affected by the environment, education, family etc. Extrovert vs introvert closer to being left handed vs right handed.

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Genuinely curious, do you have a source on introversion/extroversion being biological like handedness?

I always assumed it was more learned. I used to be introverted but that was more due to low self esteem and now I’m more confident and rather extroverted

I am a fairly outgoing introvert. I like people, I can have conversations with ease, I am confident, but after a while my people budget is spent and I need to go somewhere quiet. There's a misconception that "introverted" means "shy", and that couldn't be further from the truth.

We can't say it's 100% genetic, but apparently more so than political orientation:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874623/

https://pubmed.ncbi.nlm.nih.gov/18075477/

https://link.springer.com/content/pdf/10.1007/s10519-015-973...

It's not as cut-and-dried as that; some studies suggest various biological links, even genetic.

https://en.m.wikipedia.org/wiki/Biology_and_political_orient...

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