As far as the world is concerned, I’ll give you three concrete places where it needs to change. Number one is in the establishment of psychology itself. What I do in my research, I was actually amazed at how biased psychology is against introversion. I expected it not to be that way because so many psychologists are introverts themselves. But I think it’s just the nature of the field that it mirrors whatever the biases are at the current time. So it used to be biased against homosexuality, biased against introversion and other stuff too. Right now, for example, they’re in a process of revising the diagnostics manual. And the last I heard is they’re considering an entry for something called introverted personality disorder. And that, to me, is just appalling."
— It’s OK to Eat Alone: Q&A with Susan Cain (the author of Quiet)