Data summary.

Treatment 1: testing of high cooperation and reversion. Treatment 2 and 3: effect in cooperation by change of pay-off matrix. The matrix changed over the group with same word (A or B).实验处理1：用于高合作行为与行为逆转的测试。实验处理2与3：探究收益矩阵（pay-off matrix）调整对合作行为的影响。针对采用相同标识（A或B）的组别，其收益矩阵将发生变更。