Affective valence, stimulus attributes, and P300: color vs. black/white and normal vs. scrambled images.
Affective valence, stimulus attributes, and P300: color vs. black/white and normal vs. scrambled images.
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DOI：
10.1016/j.ijpsycho.2008.07.016
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发表时间：
2009-01
影响因子：
3
通讯作者：
Polich, John
中科院分区：
文献类型：
--
作者：
Cano, Maya E.;Class, Quetzal A.;Polich, John
关键词：
从国际情感图片系统（IAPS）中选择图片来操纵情感效价（不愉快，中性，愉快），同时保持唤醒水平相同。这些图片以一种古怪的范式呈现，以一种视觉模式作为标准刺激。当检测到目标时，受试者按下按钮。实验1呈现彩色和黑/白色的正常图片。通过随机重新排列每个原始图片的1厘米见方的片段以产生“乱序”图像，为彩色和黑色/白色条件构建对照刺激。实验2呈现了相同的正常彩色图片与大，中，小的混乱条件（2，1，和0.5平方厘米）。P300事件相关的脑电位表现出较大的幅度超过正面相比，负面或中性图像正常的彩色图片在两个实验中。衰减和非显着的效价效应，获得了黑色/白色图像。在每项研究中，杂乱的刺激没有产生效价效应，但表现出典型的P300地形，从额叶到顶叶区域增加。研究结果表明，P300振幅是敏感的情感图片效价在刺激唤醒差异的情况下，和刺激颜色有助于ERP效价效应。
Pictures from the International Affective Picture System (IAPS) were selected to manipulate affective valence (unpleasant, neutral, pleasant) while keeping arousal level the same. The pictures were presented in an oddball paradigm, with a visual pattern used as the standard stimulus. Subjects pressed a button whenever a target was detected. Experiment 1 presented normal pictures in color and black/white. Control stimuli were constructed for both the color and black/white conditions by randomly rearranging 1 cm square fragments of each original picture to produce a “scrambled” image. Experiment 2 presented the same normal color pictures with large, medium, and small scrambled condition (2, 1, and 0.5 cm squares). The P300 event-related brain potential demonstrated larger amplitudes over frontal areas for positive compared to negative or neutral images for normal color pictures in both experiments. Attenuated and nonsignificant valence effects were obtained for black/white images. Scrambled stimuli in each study yielded no valence effects but demonstrated typical P300 topography that increased from frontal to parietal areas. The findings suggest that P300 amplitude is sensitive to affective picture valence in the absence of stimulus arousal differences, and that stimulus color contributes to ERP valence effects.
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