That's a completely nonsensical test. I grew up in a small mountain town. Are you telling me that all those people who would flood in during winter weekends and holidays to drink, party and go to the packed ski resorts were introverts?
> The terrain did not make people more introverted, but introverts were happier in the secluded area than in the flat/open area, which is consistent with the person–environment fit hypothesis.
https://www.sciencedirect.com/science/article/abs/pii/S00926...