 the neural activity associated with the self-reference effect. The mean amplitude of the positive deflection in normal subjects was larger than that in patients with schizophrenia for both gain and loss outcomes.](pone.0000000.g000){#pone.0000000.g000}  Comparison of power-spectrum changes in response to feedback stimuli {#sec000} --------------------------------------------------------------------  We compared power-spectrum changes in response to feedback stimuli 