" In a study performed by Margaret Shih and her colleagues at Harvard, a group of Asian women were given similar math tests on two separate occasions.7 The first time around, they were primed to think about the fact that they were women, stereotypically worse at math than men. The second time around, they were told to focus on their identity as Asians, generally thought to be math whizzes compared to other ethnic groups. The result: The women performed far better in the second situation than they did in the first. Their math IQs hadn’t changed and neither had the difficulty of the questions. But in the second instance they believed more in their ability, and this was enough to make a substantive difference in performance. "

― Shawn Achor , The Happiness Advantage: The Seven Principles of Positive Psychology That Fuel Success and Performance at Work