三领域厌恶情绪的时程加工模式：攻击性个体差异的视角

摘要： 本研究利用事件相关电位技术结合内隐任务范式探究了三领域厌恶情绪的加工过程，同时测量了 个体的攻击水平，以期找到加工厌恶情绪的个体差异。在加工早期（130-190ms），生理厌恶刺激和道德厌恶刺激均可得到识别；在加工中期（300-350ms） ,三种厌恶刺激相互分离，三种厌恶情绪之间得到了区分；在加工晚期（400-600ms） ,个体则对性厌恶刺激最为敏感； 不同攻击水平个体在加工厌恶刺激的过程中并未表现出明显的个体差异。结果表明， 在神经层面上，三维结构下的厌恶情绪确实能够得到识别与区分。
Abstract: Disgust, an emotion motivating withdrawal from offensive stimuli, protects us from the risk of various pathogens and socio-moral violations. According to the three-domain model of disgust, pathogen disgust, sexual disgust and moral disgust are three major subtypes of the disgust emotions; disgust is considered as a heterogeneous construct consisting of multiple subtypes with distinct characteristics. Previous studies have endeavored to investigate the neural basis of pathogen disgust and moral disgust. However, it is worthwhile to systematically compare the neural underpinnings across the three subtypes of disgust with a special interest in finding out the individual differences of the disgust emotions . Therefore, in the current study, we examined the dynamic neuro-cognitive mechanisms underlying the three domains of disgust by recruiting undergraduates with different aggression level as participants. We utilized a 4 (stimulus types: pathogen disgust, moral disgust, sexual disgust, neutral) × 2 (groupss: group with high aggression level vs group with low aggression level) mixed design. The electroencephalogram (EEG) signals were recorded while participants performed a modified oddball task. The materials consisted of 40 deviant stimuli (10 pathogen disgust, 10 moral disgust, 10 sexual disgust, 10 neutral) and standard stimuli (pseudo words). Before the formal experiment, the aggression level was measured among participants by using the Buss-Perry aggression scales. Then 21 subjects were selected for the high-aggression-level group and another 20 subjects for low-aggression-level group. During the lexical decision task, participants were asked to indicate whether the visual stimulus was a word or not by pressing “d” or “k” on a keyboard with their left or right index finger. Every trial started with a central fixation for 500 ms, which was followed by a blank screen with a jittered duration between 500 ms and 1000 ms. Then the stimulus (i.e., disgust or pseudo word) was presented at the center of the screen for 2500 ms, and could be terminated by making a response. The trial ended with a blank screen with a duration of 1000 ms. We mainly analyzed ERPs elicited by pathogen disgust, moral disgust, sexual disgust and neutral deviant stimuli. The visual inspection of the grand-average