Social comparison impacts stimulus evaluation in a competitive social learning task.

An interaction between Feed Valence and Block Type did not quite reach significance ( F (1, 27) = 3.81, p = .061, η p 2 = .124), but generally it appeared that there was a greater difference between P3b amplitudes to gains and losses when stimulus values varied (Gain: M = 0.77, SE = 0.24; Loss: M = 0.20, SE = 0.32), compared to when stimulus values output a constant reward rate (Gain: M = 0.51, SE = 0.34; Loss: M = 0.35, SE = 0.25).

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