Cain looks at the reasons that introversion survived as a personality trait from an evolutionary perspective. Temperament and differences in brain chemistry are innate characteristics that affect where we lie on Jung's introversion/extroversion scale. How did extroversion become the cultural ideal in the United States? Is charisma necessary for good leadership? Why is group brainstorming ineffective from a creativity standpoint? (Brainstorming does have the benefit of making people feel closer to each other.) This book is full of fascinating stuff. You can hear and see Cain talk about some of these issues online here.
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