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. 2014 Mar 3;111(11):3990–3995. doi: 10.1073/pnas.1318570111

Fig. 2.

Fig. 2.

Brain activations related to positive indirect reciprocity. (A–C) CC-specific brain activations. ant, anterior. A and B are activation maps with P < 0.05 corrected by FWE. C shows the result of a conjunction analysis of the two types of indirect reciprocity: red, orange, and yellow areas indicate binary-valued maps derived from multiplication of the two maps shown in A and B with P < 10−3, P < 5 × 10−4, and P < 10−4, respectively. (D–F) Activity of six brain regions in the two types of reciprocal behavior and two types of indirect reciprocity game. Error bars: SEM. ***P < 0.001 in a paired t test. ns, no significant difference. (G–I) Across-subject comparison between the activity of different brain regions and the probability of cooperation after observing cooperation [i.e., P(C|C)]. r represents Pearson’s correlation coefficient between brain activity and P(C|C).