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P2 amplitudes (mean ± SEM) of the placebo and control group, for self-related and other-related pain and no pain conditions. *p < 0.05; **p < 0.01 (significant planned comparisons, independent-samples t tests, of the main hypothesis that placebo analgesia reduced P2 for both self-experienced pain and empathy for pain). No such group difference can be observed for the nonpainful conditions.
