"I’m standing in the crowd in front of the stage at the small gritty music club. My two friends—both extroverts—are on either side of me, swaying along with the crooning Indie singer and smiling. I was having fun for a while, but now I’m ready to head home and find my bed. The loud music, the dense crowd of strangers, and the small talk I’ve made all night have left me feeling drained. It’s just too much, for too long, for an introvert like me."
I think this information is wrong, this is not science. There is no references for science here because these statements have no support in science. Susan Cain's definition of Extroversion vs Introversion has no support in science from what I know.