Conducting the same test within treatments, we found that in the zero base treatments, the same difference in attitudes was statistically significant (P20z: z = –3.181, p = 0.002; N20z: z = –3.684, p = 0.0002), but that it did not achieve significance within the history treatments (see also Supplementary Table 3 ).
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On the other hand, it is also thought that psychological propensities to adopt and enforce norms have been subject to significant evolutionary pressures, suggesting there may be significant limitations on the range of possible norms 16 .