述情障碍注意转移策略的事件相关电位研究

The event-related potentials study on attentional deployment in alexithymia

目的 探讨述情障碍个体的情绪调节注意转移策略及加工机制.方法 纳入述情障碍组21例,正常对照组22例,完成注意转移实验任务,自动记录被试的反应时及正确率,Neuroscan64导脑电仪同时记录其事件相关电位.结果 ①行为学结果显示,计算任务下两组对中性图片的反应时,正确率[（1840.17±204.44） ms vs（1845.17±252.97） ms;（0.859±0.073） vs （0.884±0.068）],对负性图片的反应时,正确率[（1888.94±200.09） ms vs （1890.38±263.72） ms;（0.845±0.088） vs （0.845±0.091）]差异无统计学意义（均P＞0.05）.效价任务下两组反应时、正确率差异无统计学意义（均P＞0.05）.②反应时及正确率任务主效应有统计学意义（F（1,42）=637.40,P＜0.01;F（1,42）=15.00,P＜0.01）,情绪主效应有统计学意义（F（1,42）=30.23,P＜0.01;F1,42）=47.87,P＜0.01）,任务与情绪交互效应有统计学意义（F2,41）=5.20,P＜0.05;F（2,41）=6.01,P＜0.05）.③计算任务中性和负性情绪图片诱发的P3波幅差异无统计学意义（均P＞0.05）,情绪任务下负性情绪图片诱发的P3波幅大于中性图片,差异有统计学意义[（-0.138±0.463）μV vs （0.789±0.541）μV,P＜0.05].组间差异无统计学意义.结论 注意转移策略可以有效调节负性情绪图片的加工,并且该调节效应发生在图片加工的晚期阶段.述情障碍个体在该调节策略上没有缺陷.

Objective To study the attentional deployment strategy of emotion regulation and its processing mechanisms in alexithymia.Methods 21 alexithymia subjects and 22 normal subjects completed attentional deployment task.The reaction time（RT） and accuracy were recorded automatically and the event-related potentials （ERPs） were recorded by neuroscan system.Results ①From the behavioral results,the differences of RT and accuracy to neutral pictures （（1840.17±204.44） ms vs （1845.17±252.97） ms;（0.859±0.073） vs （0.884±0.068）） and negative pictures （（1888.94±200.09） ms vs（1890.38±263.72） ms）;（0.845±0.088） vs （0.845±0.091）） in calculation task between two groups were not statistically significant（all P〉0.05）.The differences of RT and accuracy in emotion task were not statistically significant（P〉0.05）.②In RT and accuracy,the task main effects were statistically significant（F（1,42） =637.40,P〈0.01;F（1,42）=15.00,P〈0.01）,the emotion main effects were statistically significant （F（1,42）=30.23,P〈0.001;F（i,42）=47.87,P〈0.01）,the interaction effects of task and emotion were statistically significant（F（2,41） =5.20,P〈0.05;F（2,41）=6.01,P〈0.05）.③The differences between two groups in P3 amplitude induced by neutral pictures and negative pictures in calculation task were not statistically significant（P〉0.05）.P3 amplitude induced by negative pictures were siguificantly greater than those induced by neutral pictures in emotion task（（-0.138±0.463） μV vs （0.789±0.541） μV）.Conclusion The attentional deployment can effectively regulate the negative pictures processing and occur in the late stage of the picture processing.No attentional deployment defects in alexithymia.