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. 2009 Dec 4;106(51):21539–21543. doi: 10.1073/pnas.0912174106

Fig. 1.

Fig. 1.

Subjects need to select the odd facial image from among four. On this trial, the odd image is a member of group 1 (Top Left) compared with three members of group 2. For monkeys living in group 1 this trial represents the In-group Odd condition, but for those living in group 2 it is the Out-group Odd condition.