Feng Chunliang, Li Wanqing, Tian Tengxiang, Luo Yi, Gu Ruolei, Zhou Chenglin, Luo Yue-Jia
a School of Kinesiology , Shanghai University of Sport , Shanghai , China.
Soc Neurosci. 2014;9(4):364-77. doi: 10.1080/17470919.2014.896827. Epub 2014 Mar 7.
Valence and arousal are primary dimensions of affective stimuli. An interaction of these two factors on affective processing is largely unknown. In this study, the processing of affective pictures was investigated in an orthogonal valence (positive vs. negative) by arousal (high vs. low) task design. Participants were instructed to passively view each presented picture and did not need to make any responses. The valence by arousal interaction was observed on three event-related potential (ERP) components, including the P2 (160-190 ms), N2 (220-320 ms) and late positive potential (LPP) (400-700 ms). This interaction revealed that negative pictures evoked larger neural responses compared with positive pictures (i.e., negative bias) at the high-arousal level, whereas negative pictures evoked smaller neural responses than positive pictures (i.e., positive offset) at the low-arousal level. The current results suggest that the effect of emotional valence on affective picture perception is modulated by levels of arousal at both early and late stages of processing. Finally, the main effect of valence was evident in the P1 component (90-110 ms) and arousal effect in the N1 component (120-150 ms).
效价和唤醒是情感刺激的主要维度。这两个因素在情感加工过程中的相互作用在很大程度上尚不清楚。在本研究中，通过效价（积极与消极）×唤醒（高与低）的任务设计，对情感图片的加工进行了研究。参与者被要求被动观看每一张呈现的图片，无需做出任何反应。在三个事件相关电位（ERP）成分上观察到了效价×唤醒的交互作用，包括P2（160 - 190毫秒）、N2（220 - 320毫秒）和晚期正电位（LPP）（400 - 700毫秒）。这种交互作用表明，在高唤醒水平下，消极图片比积极图片诱发更大的神经反应（即消极偏向），而在低唤醒水平下，消极图片比积极图片诱发更小的神经反应（即积极偏移）。当前结果表明，情感效价对情感图片感知的影响在加工的早期和晚期阶段均受到唤醒水平的调节。最后，效价的主效应在P1成分（90 - 110毫秒）中明显，唤醒效应在N1成分（120 - 150毫秒）中明显。
