Affective valence and P300 when stimulus arousal level is controlled
Affective valence and P300 when stimulus arousal level is controlled
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DOI：
10.1080/02699930600926752
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发表时间：
2007-01-01
影响因子：
2.6
通讯作者：
Polich, John
中科院分区：
文献类型：
--
作者：
Conroy, Matthew A.;Polich, John
采用国际情感图片系统（IAPS）中的视觉刺激，在一个改进的oddball范式中，诱发年轻成年女性（N = 12）的P300事件相关脑电位（ERP）。这些图片在效价（消极、中性、积极）评级上各不相同，但具有相同的中等唤醒水平评级。这些图像被呈现为具有标准刺激的目标，所述标准刺激由红/白色三角形组成，所述标准刺激被设计成模仿图片的空间频率。P300振幅从消极相对于中性刺激较小的额叶区，而振幅从积极相对于中性刺激没有差异。P300幅度的差异之间的效价类别是一致的中线电极，并没有改变在顶叶区，唤醒效果通常观察。研究结果提示，效价影响P300的额叶波幅，在使用情绪刺激诱发ERPs时应控制唤醒水平。理论影响进行了讨论。
Visual stimuli from the International Affective Picture System (IAPS) were employed in a modified oddball paradigm to elicit the P300 event-related brain potential (ERP) in young adult females (N = 12). The pictures varied on valence (negative, neutral, positive) ratings but had the same medium arousal level ratings. The images were presented as targets with a standard stimulus composed of red/white triangles designed to mimic the spatial frequency of the pictures. P300 amplitude from negative relative to neutral stimuli was smaller over frontal areas, whereas amplitude from positive relative to neutral stimuli did not differ. P300 amplitude differences among valence categories were consistent across the midline electrodes, and did not change over the parietal area where arousal effects are typically observed. The findings suggest that valence affects P300 frontal amplitude, and arousal level should be controlled when using emotional stimuli to elicit ERPs. Theoretical implications are discussed.