In a study done at the University of Amsterdam in the Netherlands, 196 college students, ages 17 to 44, played an online prisoner's dilemma game. During the first round, a virtual opponent cooperated with the participant's playing strategy and each shared the winnings. During the second round, the opponent abandoned the participant's strategy and earned a a larger winning. After both rounds, participants were shown pictures of the virtual female opponent, who had one of four expressions: neutral, neutral with blush, embarrassment, or embarrassment with blush.
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