Vanderploeg R D, Brown W S, Marsh J T
Department of Neurology, University of South Florida College of Medicine, Tampa.
Int J Psychophysiol. 1987 Oct;5(3):193-205. doi: 10.1016/0167-8760(87)90006-7.
Visual event-related potentials (ERPs) to two types of stimuli (faces and words) were analyzed to determine the effects of the perceived emotional connotations of the stimuli (positive, neutral, or negative) in 10 right-handed normal functioning adult males. Principal component analysis (PCA) of the ERPs reveals 5 factors accounting for over 90% of the ERP waveform variance for both faces and words. In the facial data, two ERP components varied in amplitude according to the perceived emotional connotation of the stimulus. For the P3 component, neutrally rated stimuli produced significantly larger amplitudes than stimuli rated as positive or negative. This effect was lateralized to the left hemisphere. A later positive component, the slow wave (448-616 ms), manifested complementary effects, i.e. faces perceived as positive and negative produced larger amplitudes than those perceived as neutral over the right hemisphere. The verbal stimuli did not result in significant main effects for perceived emotional connotation, but produced subtle connotation-related differences in slow wave topography. Hemispheric asymmetries, unrelated to affective connotation, were evident in the verbal data, manifesting different patterns of lateralization depending on the ERP component. The results suggest that differential processing of emotional connotation affects ERP waveforms and that the effects can be understood in terms of ERP components known to be associated with more general aspects of cognitive processing.
对10名右利手正常功能成年男性的视觉事件相关电位（ERP）进行分析，以确定两种类型刺激（面孔和单词）的感知情感内涵（积极、中性或消极）所产生的影响。ERP的主成分分析（PCA）显示有5个因素占面孔和单词ERP波形方差的90%以上。在面部数据中，两个ERP成分的振幅根据刺激的感知情感内涵而变化。对于P3成分，中性评分的刺激产生的振幅明显大于评为积极或消极的刺激。这种效应在左半球表现为优势。一个较晚的正成分，慢波（448 - 616毫秒），表现出互补效应，即被视为积极和消极的面孔在右半球产生的振幅大于被视为中性的面孔。言语刺激在感知情感内涵方面没有产生显著的主效应，但在慢波地形图上产生了与内涵相关的细微差异。在言语数据中，与情感内涵无关的半球不对称很明显，根据ERP成分表现出不同的优势模式。结果表明，情感内涵的差异处理会影响ERP波形，并且这些影响可以根据已知与认知处理更一般方面相关的ERP成分来理解。
