Kayser J, Tenke C, Nordby H, Hammerborg D, Hugdahl K, Erdmann G
Institute of Psychology, Technical University of Berlin, Germany.
Psychophysiology. 1997 Jul;34(4):414-26. doi: 10.1111/j.1469-8986.1997.tb02385.x.
To investigate the hypothesis of a right hemispheric superiority in negative emotional processing, event-related potentials (ERPs) were recorded from 17 sites (Fz, Cz, Pz, F3/4, F7/8, C3/4, T7/8, P3/4, P7/8, O1/2) in a visual half-field paradigm. While maintaining fixation, right-handed women viewed pictures of patients with dermatological diseases before (negative) and after (neutral) cosmetic surgery. A principal components analysis with Varimax rotation performed on ERPs revealed factors identified as N1, N2, early P3, late P3, and slow wave. Repeated measures analyses of variance performed on factor scores revealed a significant effect of emotional content for all factors except for N1. However, asymmetries in emotional processing were restricted to N2 and early P3, with maximal effects over the right parietal region. N2-P3 amplitude was augmented for negative and reduced for neutral stimuli over right hemisphere regions. Visual field presentation interacted with these asymmetries in enhancing amplitudes contralaterally for early but ipsilaterally for late ERP components. Overall, findings for N2 and P3 support theories of an asymmetry in emotional processing.
为了研究在负性情绪加工中右半球优势的假设，在视觉半视野范式下，从17个部位（Fz、Cz、Pz、F3/4、F7/8、C3/4、T7/8、P3/4、P7/8、O1/2）记录事件相关电位（ERP）。在保持注视的同时，右利手女性观看了皮肤病患者在整容手术前（负性）和后（中性）的照片。对ERP进行具有方差最大化旋转的主成分分析，揭示了被确定为N1、N2、早期P3、晚期P3和慢波的因素。对因素得分进行重复测量方差分析，结果显示除N1外，所有因素的情绪内容均有显著影响。然而，情绪加工的不对称性仅限于N2和早期P3，在右顶叶区域影响最大。在右半球区域，负性刺激的N2 - P3波幅增大，中性刺激的波幅减小。视野呈现与这些不对称性相互作用，早期ERP成分的波幅在对侧增强，晚期ERP成分的波幅在同侧增强。总体而言，N2和P3的研究结果支持了情绪加工中存在不对称性的理论。
