For those of us who want a more comprehensive take on the exact psychology of introversion and extroversion beyond certain socialising preferences, let’s plug in and do it here. Theories and resources (some worse than others) abound but I’m going to reference a fair bit of Michael Pierce for his philosophical insight. He’s not perfect and he makes certain less-preferred cognitive functions sound way weaker than they actually are (forgetting that a healthy person of whatever type is fundamentally a normal person) but for the richness of his type-descriptions that’s something that’s worth overlooking.
16personalities.com gets flack for being just another big-5 test and it is but for the sake of the fact that it has easy access to a testing quiz, let’s just ball it out for now.
https://www.16personalities.com/free-personality-test