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[They also rated how generally extroverted those fake extroverts appeared, based on their recorded voices and body language.]
Some years ago, a psychologist named Richard Lippa called a group of introverts to his lab and asked them to act like extroverts while pretending to teach a math class. ( ¨ç ) Then he and his team, with video cameras in hand, measured the length of their strides, the amount of eye contact they made with their ¡°students,¡± the percentage of time they spent talking, and the volume of their speech. ( ¨è ) Then Lippa did the same thing with actual extroverts and compared the results. ( ¨é ) He found that although the latter group came across as more extroverted, some of the fake extroverts were surprisingly convincing. ( ¨ê ) It seems that most of us know how to fake it to some extent. ( ¨ë ) Whether or not we¡¯re aware that the length of our strides and the amount of time we spend talking and smiling mark us as introverts and extroverts, we know it unconsciously.