Grimshaw Gina M, Foster Joshua J, Corballis Paul M
School of Psychology, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand.
School of Psychology, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
Brain Cogn. 2014 Oct;90:76-86. doi: 10.1016/j.bandc.2014.06.008. Epub 2014 Jul 9.
Frontal and parietal electroencephalographic (EEG) asymmetries mark vulnerability to depression and anxiety. Drawing on cognitive theories of vulnerability, we hypothesise that cortical asymmetries predict attention to threat. Participants completed a dot-probe task in which bilateral face displays were followed by lateralised targets at either short (300ms) or long (1050ms) SOA. We also measured N2pc to face onset as an index of early attentional capture. At long SOA only, frontal and parietal asymmetry interacted to predict attentional bias to angry faces. Those with leftward frontal asymmetry showed no attentional bias. Among those with rightward frontal asymmetry those with low right parietal activity showed vigilance for threat, and those with high right parietal activity showed avoidance. Asymmetry was not related to the N2pc or to attentional bias at the short SOA. Findings suggest that trait asymmetries reflect function in a fronto-parietal network that controls attention to threat.
额叶和顶叶脑电图（EEG）不对称表明易患抑郁症和焦虑症。基于易感性的认知理论，我们假设皮层不对称预示着对威胁的关注。参与者完成了一项点探测任务，在该任务中，双边面部展示之后是短（300毫秒）或长（1050毫秒）刺激间隔（SOA）的侧化目标。我们还测量了面部出现时的N2pc，作为早期注意力捕捉的指标。仅在长刺激间隔时，额叶和顶叶不对称相互作用，以预测对愤怒面孔的注意力偏向。左侧额叶不对称者未表现出注意力偏向。在右侧额叶不对称者中，右侧顶叶活动低者对威胁保持警惕，而右侧顶叶活动高者则表现出回避。在短刺激间隔时，不对称与N2pc或注意力偏向无关。研究结果表明，特质不对称反映了控制对威胁注意力的额顶叶网络中的功能。
