Abstract

Individuals who with suicide behaviors pay more attention to negative signals than positive ones. However, it is unclear that whether this bias exists when suicide ideators perceive interpersonal stimuli (such as faces with emotion) and the underlying neural mechanism of the attention process. The present study aimed to examine the attentional bias toward emotional facial expressions by employing event-related potentials in a population with suicide ideation. Twenty-five undergraduates with suicide ideation (SI group) and sixteen undergraduates without suicide ideation (NSI group) participated in a modified dot-probe task. Compared to the NSI group, the SI group exhibited: (1) a longer mean reaction time to fearful faces; (2) a larger N1 component to fearful faces; (3) a larger N1 component to the location of sad faces, as well as to the opposite location of fearful faces and happy faces; and (4) a larger N1 component to the contralateral location of happy faces, whereas the NSI group elicited a larger N1 component to the ipsilateral location of happy faces. These results indicated that the SI group was more sensitive to negative emotions (fearful and sad faces) than positive emotions (happy faces), and the negative interpersonal stimuli in suicide ideators was processed at an early attention stage.

摘要

有自杀行为的人更关注负面信号而不是正面信号。然而，目前尚不清楚自杀意念者感知人际刺激（例如带有情感的面孔）时是否存在这种偏见以及注意过程的潜在神经机制。本研究旨在通过在有自杀意念的人群中利用事件相关电位来检查对情绪面部表情的注意力偏差。25 名有自杀意念的本科生（SI 组）和 16 名没有自杀意念的本科生（NSI 组）参加了修改后的点探针任务。与NSI组相比，SI组表现出：（1）对恐惧面孔的平均反应时间更长；(2) 恐惧面孔的 N1 分量更大；(3) 悲伤面孔的位置以及恐惧面孔和快乐面孔的相反位置具有较大的 N1 分量；(4) 笑脸对侧位置的 N1 分量较大，而 NSI 组笑脸同侧位置的 N1 分量较大。这些结果表明，SI组对消极情绪（恐惧和悲伤的面孔）比积极情绪（快乐的面孔）更敏感，自杀意念者的消极人际刺激在早期注意力阶段就得到了处理。