注意分散情绪调节的晚期正电位

Late Positive Potentials of Attentional Distraction of Emotion Regulation

目的:从Gross的情绪过程模型出发,利用双任务范式研究在情绪产生过程中注意分散是否调节晚期正电位(late positive potential,LPP)。方法:招募20名大学生(9男/11女),从中国情感图片系统选择正性、中性和负性情境图各29张为刺激,采用默数和深呼吸为注意分散任务,记录和测量情绪状态强度和事件相关电位数据。结果:默数、深呼吸条件下所评价的情绪状态强度显著小于看条件。LPP波幅在早期(350-650 ms)、中期(650-1050 ms)和晚期(1050-1500 ms)窗口呈现出不同的任务与图片效价交互作用。从350 ms开始,默数条件下三种图片的LPP波幅低于看条件;深呼吸条件下负性图片的LPP波幅低于看条件,但在晚期窗口正性和中性图片的LPP波幅与看条件无差异。结论:注意分散不仅有效降低被试的主观情绪状态强度,而且能够调节LPP波幅,是有效的情绪调节策略,但默数和深呼吸对不同效价的图片呈现出不同的时间过程模式。

Objective： Based on Gross＇s model of emotional process, a dual task paradigm was used to investigate whether attentional distraction could modulate late positive potentials （LPPs） in the process of emotion generation. Methods： 20 undergraduates（9 males/11 females）, were recruited 29 positive, neutral, and negative pictures were selected from Chinese Affective Picture System, and silent-counting and deep-breathing were used as distraction tasks while recording participants＇ behavioral and event-related potentials＇ data. Results： Participants rated lower emotional state intensity during silent-counting and deep-breathing tasks than during viewing task. Within three time windows at central-parietal sites, early windows（350-650 ms）, middle windows（650-1050 ms）, and late windows（1050-1500 ms）, LPP amplitudes displayed different interactions of task and emotional valence. Beginning with 350 ms, silent-counting decreased LPP amplitudes relative to viewing task, regardless of emotional valences; deep-breathing decreased LPP amplitudes for negative pic- tures from 350 to 1500 ms, but only from 350 to 1050 ms for positive and neutral pictures. Conclusion： Attentional distractions decrease subjective emotional state intensity and modulate LPP amplitudes, but silent-counting and deepbreathing demonstrate distinct temporal patterns following the presentation of three valence pictures.