system
Given the following post, respond as if you're commenting on Reddit:
human
Are people born with different types of brains or are they just clean slates?

What I mean is, are people born with brains that have certain personalities (ex; extroverted vs. introverted) and/or with brains that can do certain things very well (thinking critically vs. something else) or are there personalities developed strictly through experience?
gpt
Somewhat boring answer, but both make significant contributions. Much about personality is genetically loaded (your extroverted vs. introverted example is quite high on this actually) but a ton of it is environmental as well (even highly heritable personality traits have significant environmental contributions). There is also some overweighting of genetic factors because the pre-birth environment (the womb) has a lot more effect than you'd think and researchers are not always sensitive to this.

There is also the issue that environment and genetics is very difficult to disentangle, they are often mutually reinforcing (genetic predisposition causes person to seek a particular environment which reinforces the predisposition and so on).

The nature vs. nurture debate has kind of gone out of style, possibly because "well both make measured contributions with varying levels depending on trait blah blah blah" isn't all that exciting.