On Laughing Squid:
In a highly informative episode of Life Noggin, narrator Pat Graziosi aka Blocko enlisted the help of fellow YouTuber Anthony Padilla to explain the physiological and psychological differences between introverts and extroverts.
One of the primary differences between the two is not necessarily in sociability, but rather the time needed to recharge from said sociability. They also talk about ambiverts, those who have a little of both and make up the majority of the population.
The following video was shared on that page: