Haas Brian W, Omura Kazufumi, Amin Zenab, Constable R Todd, Canli Turhan
Stony Brook University, Stony Brook, NY 11794-2500, USA.
Soc Neurosci. 2006;1(1):16-24. doi: 10.1080/17470910600650753.
Previous research has investigated the association of personality traits with brain activation in response to emotional stimuli. Our current research efforts are directed at understanding the temporal dynamics of networks of structures associated with particular personality traits, and gain insights into the functional contributions of more narrowly defined trait-facets that comprise these personality traits. To begin this process, we conducted a functional magnetic resonance imaging (fMRI) study using an emotional attention task (emotional Stroop paradigm) and addressed the question whether individual differences in extraversion and its lower-level facets were associated with differences in activation, and in functional connectivity, of the anterior cingulate (AC) cortex. We replicated our earlier finding that extraversion was associated with increased AC activation to positive, relative to neutral, word stimuli, but now show that distinct facets of extraversion can account for this association. When analyzing for functional connectivity, we found that greater extraversion across individuals was associated with greater functional connectivity between the AC and the inferior parietal lobule, and that this association could also be accounted for by distinct facets of extraversion. Our data suggest that extraversion and some of its lower-level facets are associated with individual differences across a network of structures believed to be critical in cognitive and affective processing.
以往的研究调查了人格特质与大脑对情绪刺激的激活之间的关联。我们目前的研究致力于理解与特定人格特质相关的结构网络的时间动态，并深入了解构成这些人格特质的更狭义定义的特质方面的功能贡献。为了启动这一过程，我们使用情绪注意力任务（情绪Stroop范式）进行了一项功能磁共振成像（fMRI）研究，并探讨了外向性及其较低层次方面的个体差异是否与前扣带回（AC）皮质的激活差异以及功能连接差异相关的问题。我们重复了我们早期的发现，即相对于中性词刺激，外向性与AC对积极词刺激的激活增加有关，但现在表明外向性的不同方面可以解释这种关联。在分析功能连接时，我们发现个体间更高的外向性与AC和下顶叶小叶之间更强的功能连接有关，并且这种关联也可以由外向性的不同方面来解释。我们的数据表明，外向性及其一些较低层次的方面与一个被认为在认知和情感处理中至关重要的结构网络中的个体差异有关。
