Department of Psychology, University of Portsmouth, King Henry I Street, Portsmouth PO1 2DY, UK.
Int J Psychophysiol. 2012 Aug;85(2):135-44. doi: 10.1016/j.ijpsycho.2012.06.006. Epub 2012 Jun 23.
Previous research has revealed that EEG theta oscillations are affected during goal conflict processing. This is consistent with the behavioural inhibition system (BIS) theory of anxiety (Gray & McNaughton, 2000). However, studies have not attempted to relate these BIS-related theta effects to BIS personality measures. Confirmation of such an association would provide further support for BIS theory, especially as it relates to trait differences. EEG was measured (32 electrodes) from extreme groups (low/high trait BIS) engaged in a target detection task. Goal conflicts were introduced throughout the task. Results show that the two groups did not differ in behavioural performance. The major EEG result was that a stepwise discriminant analysis indicated discrimination by 6 variables derived from coherence and power, with 5 of the 6 in the theta range as predicted by BIS theory and one in the beta range. Also, across the whole sample, EEG theta coherence increased at a variety of regions during primary goal conflict and showed a general increase during response execution; EEG theta power, in contrast, was primarily reactive to response execution. This is the first study to reveal a three-way relationship between the induction of goal conflict, the induction of theta power and coherence, and differentiation by psychometrically-defined low/high BIS status.
先前的研究表明，在处理目标冲突时，脑电图θ波振荡会受到影响。这与焦虑的行为抑制系统（BIS）理论（Gray 和 McNaughton，2000）一致。然而，这些研究并未试图将这些与 BIS 相关的θ效应与 BIS 人格测量联系起来。如果能够证实这种关联，将为 BIS 理论提供进一步的支持，尤其是在涉及特质差异方面。研究使用脑电图（32 个电极）对参与目标检测任务的极端群体（低/高特质 BIS）进行了测量。在整个任务中引入了目标冲突。结果表明，这两个群体在行为表现上没有差异。主要的脑电图结果表明，逐步判别分析表明，通过来自相干性和功率的 6 个变量进行区分，其中 5 个在 BIS 理论预测的θ范围内，1 个在β范围内。此外，在整个样本中，在主要目标冲突期间，多种区域的脑电图θ相干性增加，并且在反应执行期间普遍增加；相比之下，脑电图θ功率主要对反应执行做出反应。这是第一项揭示目标冲突的诱导、θ功率和相干性的诱导以及通过心理测量定义的低/高 BIS 状态的区分之间的三向关系的研究。
