Cooperation is central to human social life, especially meaningful to children's development. Cooperation often involves a tension between what is best for an individual and what is best for a group. A group does better when everybody cooperates, but each individual group member is tempted to defect, that is to say, reap the benefits of others' cooperation without paying the cost of cooperating oneself. Situations in which individual and collective benefits conflict are often investigated experimentally in social dilemmas,such as the prisoner's dilemma game. Antecedents,consequences and development of cooperative behavior in normally developing children and children with high function autism will be explored in the methods of laboratory observation, video analysis, laboratory experiment and eye tracking. 1) Classical prisoner's dilemma game and cooperative implemental tasks will be used to examine cooperaive behavior in normally developing 2-12 years old children and children with high function autism. 2) The impact of individual's internal social cognition (mainly refers to intention understanding in this study) and external punishment sanction on children's cooperative behavior will be examined in order to further figure out the antecedents of cooperation.Eye tracking technique will be used to examine childre
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