Goethe University Frankfurt, Frankfurt, Germany.
J Cogn Neurosci. 2011 Oct;23(10):3132-45. doi: 10.1162/jocn_a_00003. Epub 2011 Mar 10.
An impairment of attentional control in the face of threat-related distracters is well established for high-anxious individuals. Beyond that, it has been hypothesized that high trait anxiety more generally impairs the neural efficiency of cognitive processes requiring attentional control-even in the absence of threat-related stimuli. Here, we use fMRI to show that trait anxiety indeed modulates brain activation and functional connectivities between task-relevant brain regions in an affectively neutral Stroop task. In high-anxious individuals, dorsolateral pFC showed stronger task-related activation and reduced coupling with posterior lateral frontal regions, dorsal ACC, and a word-sensitive area in the left fusiform gyrus. These results support the assumption that a general (i.e., not threat-specific) impairment of attentional control leads to reduced neural processing efficiency in anxious individuals. The increased dorsolateral pFC activation is interpreted as an attempt to compensate for suboptimal connectivity within the cortical network subserving task performance.
面对与威胁相关的干扰,高焦虑个体的注意力控制受损已得到充分证实。除此之外,还有假说认为,高特质焦虑通常会损害需要注意力控制的认知过程的神经效率——即使在没有与威胁相关的刺激的情况下。在这里,我们使用 fMRI 表明,特质焦虑确实会调节情感中性 Stroop 任务中与任务相关的大脑区域之间的大脑激活和功能连接。在高焦虑个体中,背外侧前额叶皮层显示出更强的与任务相关的激活,并且与后外侧额区、背侧 ACC 和左侧梭状回中的一个单词敏感区域的耦合减少。这些结果支持了这样一种假设,即注意力控制的一般(即非特定于威胁)损伤会导致焦虑个体的神经处理效率降低。背外侧前额叶皮层的激活增加被解释为试图补偿执行任务的皮质网络内的连接不良。