Institut für Psychologie, University of Osnabrueck Osnabrueck, Germany.
Front Hum Neurosci. 2013 Dec 30;7:902. doi: 10.3389/fnhum.2013.00902. eCollection 2013.
Previous research on relationships between affective-motivational traits and hemispheric asymmetries in resting frontal alpha band power as measured by electroencephalography (EEG) focused on individual differences in motivational direction (approach vs. withdrawal) or behavioral activation. The present study investigated resting frontal alpha asymmetries in 72 participants as a function of individual differences in the implicit affiliation motive as measured with the operant motive test (OMT) and explored the brain source thereof. Decreased relative right frontal activity as indexed by increased alpha band power was related to low levels of the implicit affiliation motive. No relationships were found for explicit personality measures. Intracranial current density distributions of alpha based on Variable Resolution Electromagnetic Tomography (VARETA) source estimations suggests that the source of cortical alpha distribution is located within the right ventromedial prefrontal cortex (PFC). The present results are discussed with respect to differential roles of the two hemispheres in social motivation.
先前有关情感动机特质与静息状态下额区 alpha 频段功率的大脑左右半球不对称性之间关系的研究，主要集中在动机方向（趋近与回避）或行为激活的个体差异上。本研究通过操作性动机测验（OMT）测量了 72 名参与者的内隐联系动机的个体差异，探讨了静息状态下额区 alpha 不对称性的功能及其脑源。相对右侧额区活动的减少（以 alpha 频段功率的增加为指标）与内隐联系动机水平较低有关。对于外显人格测量没有发现相关关系。基于可变分辨率电磁断层扫描（VARETA）源估计的 alpha 脑内电流密度分布表明，皮质 alpha 分布的源位于右侧腹内侧前额叶皮质（PFC）内。本研究结果与大脑两个半球在社会动机中的不同作用有关。
