抑郁症患者识别悲伤表情时额叶-扣带回功能连接的初步研究

目的 分析抑郁症患者及健康对照在识别悲伤面部表情过程中额叶-扣带回功能连接差异,以初步探讨抑郁症患者情绪偏向性的神经基础.方法 检测12例女性重型抑郁症患者和12例匹配健康对照在识别悲伤及中性面部表情时的激活脑区,基于动态因果模型比较2组额叶-扣带回功能连接强度.结果 对刺激调节连接模型进行贝叶斯模型比较得出:模型二与观测数据更为匹配,模型二与模型一的比较上,平均贝叶斯因子大于7.38;模型二与模型三的比较上,平均贝叶斯因子大于2.71.以固有连接模型和刺激调节连接模型二分别进行固有连接参数和刺激调节连接参数计算后,结果表现在抑郁症患者前扣带回与右额下回之间两种连接参数高于正常对照.结论 抑郁症患者存在额叶-扣带回功能连接异常增强,这可能是负性情绪偏向性的神经基础.

Preliminary exploration of the frontal-cingulate functional connection during identifying sad facial expression in depressed patients

Objective To analyze the difference of frontal-cingulate functional connection between patients with major depression and healthy controls in recognization of sad facial expression, and discuss the neutral basis of emotional bias in preliminary. Methods 12 female patients with major depression and 12 matched healthy controls were scanned. The intensities of brain activation in the process of sad and neutral facial expression recognition were analyzed, and the strengths of frontal-cingulate functional connection were compared between the two groups based on dynamic causal modeling. Results Comparing the stimulus adjusting connection models with Bayesian model indicated that model Ⅱ matched with the observation data better. In the comparison between model Ⅱ and model I ,the average Bayes factor was more than 7.38. In the comparison between model Ⅱ and model Ⅲ,the average Bayes factor was more than 2.71. Calculating the intrinsic connection parameters and stimulus adjusting connection parameters based on intrinsic connection model and stimulus adjusting connection model( model Ⅱ ), the result showed that connection strength between anterior cingulate and right inferior frontal gyrus in depression was greater than that in healthy controls. Conclusion The frontal-cingulate functional connection of patients with major depression is increased abnormally ,which may be the neural basis of negative emotional bias.