Huster Rene J, Stevens Stephan, Gerlach Alexander L, Rist Fred
Institute for Biomagnetism and Biosignalanalysis, University of Münster, Münster, Germany.
Int J Psychophysiol. 2009 May;72(2):212-6. doi: 10.1016/j.ijpsycho.2008.12.009. Epub 2008 Dec 24.
Frontal EEG asymmetry has been linked to emotional and motivational reactivity. A frequently applied method to provoke specific asymmetry profiles is the presentation of affective film clips. Although these films might elicit strong emotional reactions, the exact time course and peak of an affective response remains unclear. In an alternative attempt, stimuli from the International Affective Picture System (IAPS), known to reliably alter emotional states, are utilized. These stimuli are less likely to cause excessive variations in affective responding. However, relevant studies have most often been unable to find the predicted effects. One reason for such failures might be the inadequate knowledge about the minimum number of stimuli needed for psychometrically stable results. In the present study, an adequate split-half reliability for the experimental procedure was assured and substantial effects of affective picture category were found. This pattern of results was robust for both Cz and linked ears as reference. Thus, presenting pictures with an adequate recording length might be a reliable alternative for inducing affective reactions in alpha asymmetry research.
额叶脑电图不对称性与情绪和动机反应性有关。一种常用的引发特定不对称模式的方法是呈现情感电影片段。尽管这些电影可能会引发强烈的情绪反应，但情感反应的确切时间进程和峰值仍不清楚。作为另一种尝试，人们利用了国际情感图片系统（IAPS）中已知能可靠改变情绪状态的刺激。这些刺激不太可能导致情感反应过度变化。然而，相关研究大多未能发现预期的效果。此类失败的一个原因可能是对获得心理测量稳定结果所需的最小刺激数量了解不足。在本研究中，确保了实验程序具有足够的分半信度，并发现了情感图片类别的显著影响。对于以Cz和双耳连接作为参考的情况，这种结果模式都很稳健。因此，在α波不对称性研究中，呈现具有足够记录时长的图片可能是诱导情感反应的可靠替代方法。
