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N2 amplitudes. a Mean N2 amplitudes (± SEM) across conditions. There was a tendency towards a larger reduction in N2 amplitude after 4 mg/kg caffeine compared to 0 mg. b Reduction in N2 amplitude correlated with reduction in pain in the placebo condition (r = .48, p = .03). c Reduction in N2 amplitude correlated with reduction in pain in the active placebo condition (r = .54, p = .01)
