述情障碍者情绪启动效应的ERPs特征

目的:分析述情障碍者情绪启动中的ERPs特征,探讨述情障碍者情绪自动加工缺陷的神经机制。方法:采用TAS-20中文版筛选出述情障碍者与非述情障碍者进入情绪启动实验。以阈下或阈上方式呈现启动图片,要求受试对目标图片做出正负性的判断,记录受试ERPs数据。结果:在阈上启动任务中,述情障碍组的P2波幅和"启动-非启动"差异波N600波幅均显著小于非述情障碍组的波幅,而阈下启动任务中的P2、P3潜伏期与波幅及N600波幅则均不存在显著组间差异。结论:本研究进一步支持述情障碍者对无意识感知的情绪刺激的自动加工是完整的,而对意识到的情绪刺激的自动加工存在明显的缺陷。

ERPs Characteristics of Affective Priming Effect in Alexithymia

Objective: To compare the differences of event-related potentials(ERPs) elicited by the target pictures during subliminal or supraliminal affective priming task between alexithymic and nonalexithymic,and explore neurophysiological mechanism of the deficit of automatic emotion processing in alexithymia.Methods: The Toronto Alexithymia Scale(TAS-20) was applied twice with a three months interval,alexithymic and nonalexithymic were selected to finish affective priming tasks.Prime pictures were presented subliminally or supraliminally,and subjects were required to judge whether the target picture was positive or negative,while the ERPs were recorded.Results: In supraliminal priming tasks,the alexithymic was characterized by the decreased P2 peak amplitude and N600(difference wave,primed minus unprimed) peak amplitude,while in subliminal affective priming tasks,there were no significant differences of peak latencies and amplitudes between alexithymic and nonalexithymic.Conclusion: This study provides further ERPs evidences to support that alexthymic has deficit in automatic processing for emotional information that is aware of,while has no deficit in automatic processing for emotional information that is not aware of.