Department of Psychology, Carleton University.
Brockville Mental Health Centre.
Psychol Trauma. 2018 Sep;10(5):523-532. doi: 10.1037/tra0000339.
Evidence relying on probe detection tasks suggests that anxious individuals exhibit an enhanced selective attentional bias toward emotional or threating stimuli, characterized by attentional vigilance or avoidance of threat.
Amplitude of P100 and P300 event-related potentials and behavioral measures of target detection were assessed during presentation of a dot-probe task in 18 posttraumatic stress disorder patients and 18 healthy controls to elucidate the effects of attentional bias toward threatening facial expressions.
Perceptual (P100) processing of threat-face pairs revealed no evidence of attentional bias in posttraumatic stress disorder (PTSD) patients. PTSD patients exhibited larger P100 and P300 amplitude to probes replacing neutral rather than angry faces, indicating an increased allocation of early perceptual and later strategic processing away from anger-related stimuli.
The present study provided no support for facilitated engagement in this sample of patients. Possible interpretations of the results related to differential processing of target probes replacing angry-neutral face pairs are discussed. (PsycINFO Database Record
基于探测任务的证据表明，焦虑个体对情绪或威胁性刺激表现出增强的选择性注意偏向，表现为注意警觉或对威胁的回避。
在呈现点探测任务期间，评估了 18 名创伤后应激障碍患者和 18 名健康对照者的 P100 和 P300 事件相关电位以及目标探测的行为测量，以阐明对威胁面部表情的注意偏向的影响。
对威胁面孔对的感知（P100）加工并未显示创伤后应激障碍（PTSD）患者存在注意偏向。PTSD 患者对取代中性而不是愤怒面孔的探针表现出更大的 P100 和 P300 幅度，表明对与愤怒相关的刺激的早期感知和后期策略处理的分配增加。
本研究对患者样本中这种易感性的参与提供了支持。讨论了与取代愤怒-中性面孔对的目标探针的不同处理相关的结果的可能解释。
