After a terrible head injury, Amy Cuddy wakes up in the hospital to find she's a different person.

Amy Cuddy is a social psychologist and Harvard Business School Associate Professor who studies how snap judgments and nonverbal behavior affect people from the classroom to the boardroom. Amy Cuddy's fascinating work on "power posing" reveals how your physical posture affects not only how others see you, but also how you see yourself, your own hormone levels, and your performance and important life outcomes. Researching stereotypes, emotions, nonverbal behaviors, and hormone levels, Amy explains to audiences the role these variables play in shaping our emotions, intentions and behaviors in business and society. Amy's work has been featured on CNN, MSNBC, The New York Times, The Financial Times, Scientific American Mind, The Wall Street Journal, and even as the theme of a Dilbert comic strip. Business Insider just named Amy as one of 2013's "50 Women Who are Changing the World." Her TED Talk is now the second most viewed of all time. She is also a classically trained (and still practicing) ballet dancer, which informs her research on nonverbal communication.

This story originally aired on April 2, 2014.