认知理论认为，信息加工的偏倚尤其是选择性注意偏倚在焦虑障碍的发生发展及维持中起着极为重要的作用。大量研究均提示焦虑障碍患者存在对危险刺激的选择性注意偏倚。注意偏倚矫正训练采用电脑编程的注意训练隐性改变焦虑障碍患者的选择性注意偏倚模式，从而达到缓解焦虑症状的目的。然而目前焦虑障碍选择性注意偏倚发生的脑机制尚不明确，注意偏倚矫正训练如何作用于脑神经环路改变焦虑障碍患者选择性注意偏倚模式的尚不可知。因此本研究以焦虑障碍中最常见的广泛性焦虑障碍为研究对象，采用点探测任务和功能磁共振成像技术，比较注意偏倚矫正训练前后的临床症状及脑神经影像学特点，评估注意偏倚矫正训练的疗效，探索选择性注意偏倚的神经环路基础及注意偏倚矫正训练可能的作用机制。

Cognitive theories suggest that information-processing bias especially selective attentional bias plays an important role in the etiology and maintenance of anxiety disorders. A wealth of research demonstrates that anxious individuals display an attentional bias towards threat stimulus. Attentional bias modification utilizes computer-based attention training protocols to implicity modify selective biased attentional patterns in anxious patients, in order to release anxiety symptoms. Yet the brain mechanism of selective attentional bias and the role of attentional bias modification on the neural circuit of selective attentional bias are unclear. Therefore, this study plans to employ dot probe task and functional magnetic resonance imaging technique to compare the clinical symptoms and characteristics of brain neuroimaging before and after attention bias modification in generalized anxiety disorder, to evaluate the treatment effect of attention bias modification, explore the neural circuit of selective attentional bias and the treatment mechanism of attention bias modification.