Data Analysis<br><br>Behavior performance<br><br>For each participant dyad, response times (RTs), and winning trials were recorded. Because there were some outliers in the data, the median and median absolute deviation of response times (median‐RT, mad‐RT) were calculated among all trials in each participant. Outliers were identified by calculating an interval spanning over the mean ± 3 SD. We also analyzed the median and median absolute deviation of the difference of response times (median‐DRT and mad‐DRT) between the two participants in a dyad, similar to procedures used in previous studies (Funane et al., 2011; Vesper et al., 2011). To quantify participant performance and index the quality of cooperation, we calculated the percentage of winning trials (PWT; Cheng et al., 2015; Cui et al., 2012).<br><br>Nonparametric Wilcoxon tests were used on the median‐RT, mad‐RT, median‐DRT, and mad‐RT, because the data were not normally distributed. The PWT was distributed normally, so we applied a two‐way ANOVA, with factors of Group (lover, friend, stranger) by Task Block (blocks 1, 2). Finally, we used a Bonferroni correction to account for multiple comparisons.
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