Lin Lin, Liu Yu, Mo Juanchan, Wang Chenxu, Liu Ting, Xu Zhansheng, Jiang Yunpeng, Bai Xuejun, Wu Xia
Arch Suicide Res. 2023 Jul-Sep;27(3):938-955. doi: 10.1080/13811118.2022.2096518. Epub 2022 Jul 5.
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.
有自杀行为的个体对负面信号的关注多于正面信号。然而，尚不清楚当有自杀意念者感知人际刺激（如带有情绪的面孔）时这种偏差是否存在以及注意过程的潜在神经机制。本研究旨在通过采用事件相关电位来检测有自杀意念人群对情绪化面部表情的注意偏差。25名有自杀意念的本科生（自杀意念组）和16名无自杀意念的本科生（无自杀意念组）参与了一项改良的点探测任务。与无自杀意念组相比，自杀意念组表现出：（1）对恐惧面孔的平均反应时间更长；（2）对恐惧面孔的N1成分更大；（3）对悲伤面孔位置以及恐惧面孔和快乐面孔相反位置的N1成分更大；（4）对快乐面孔对侧位置的N1成分更大，而无自杀意念组对快乐面孔同侧位置的N1成分更大。这些结果表明，自杀意念组对负面情绪（恐惧和悲伤面孔）比正面情绪（快乐面孔）更敏感，并且有自杀意念者的负面人际刺激在早期注意阶段就得到了处理。
