At this year's meeting of the Society for Personality and Social Psychology, Tamir, along with Iris Mauss of the University of Denver, presented a paper entitled, "Come On, Get Happy: The Ironic Effects of the Pursuit of Happiness." The two did not specifically study introverts or extraverts. What they discovered is that, for all people, the pressure to be happy actually reduces happiness.
"We found that when we prime people to value happiness more, they become more unhappy and depressed," reports Mauss. "Our findings offer an intriguing explanation for the vexing paradox that even in the face of objectively positive life circumstances, nations generally do not become happier."