Figure 2

Cortical responses to painful and non-painful voices at FCz and Cz in the auditory experiment. Top panel: ERP waves and voltage scalp maps of the High-AQ group in response to the painful and non-painful voices in the Auditory A-P task. Bottom panel: ERP waves and voltage scalp maps of the High-AQ and Low-AQ groups in response to the painful and non-painful voices in the Auditory A-N task. Red lines illustrate averaged amplitudes of the High-AQ group. Blue lines illustrate averaged amplitudes of the Low-AQ group. The High-AQ group elicited smaller N1 waves than the Low-AQ group in the A-N task (p = 0.030, outlined in gray shaded area), whereas no difference was found between the two groups in the A-P task (p = 0.223). The High-AQ group elicited smaller P2 waves than the Low-AQ group in response to painful voices in the A-N task (p = 0.002, outlined in gray shaded area), whereas no difference was found between the two groups in response to painful voices in the A-P task, and non-painful voices in both of the A-P and A-N tasks (p > 0.05). Topographic plots at the bottom illustrate the electrodes considered in the analysis.