Four-and-a-half years after her popular and powerful TED Talk, the social psychologist updates the research on posture and hormones, responds to her critics and discusses her current work.

Amy Cuddy’s research examines how we can understand others through body language. As the U.S. swings into the 2016 election season, here are four key insights on how to judge candidates during a presidential debate. (And one tip on how to win it.)