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Hidden wounds of violence: abnormal motor oscillatory brain activity is related to posttraumatic stress symptoms
NeuroImage ( IF 5.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.neuroimage.2020.117404
Isabela Lobo , Rafaela R. Campagnoli , Jéssica S. Figueira , Isabela Andrade , Ivan Figueira , Camila Gama , Raquel M. Gonçalves , Andreas Keil , Mirtes G. Pereira , Eliane Volchan , Leticia Oliveira , Isabel A. David

Victims of urban violence are at risk of developing Posttraumatic Stress Disorder (PTSD), one of the most debilitating consequences of violence. Considering that PTSD may be associated with inefficient selection of defensive responses, it is important to understand the relation between motor processing and PTSD. The present study aims to investigate the extent to which the severity of posttraumatic stress symptoms (PTSS) is related to motor preparation against visual threat cues in victims of urban violence. Participants performed a choice reaction time task while ignoring a picture that could be threating or neutral. The EEG indices extracted were the motor-related amplitude asymmetry (MRAA) in the alpha frequency range, and the lateralized readiness potential (LRP). We observed a linear relation between longer LRP latency and a slower reaction time, selectively during threat processing (compared to neutral) in low PTSS, but not in high PTSS participants. Alpha MRAA suppression and the PTSS were also linearly related: the smaller the alpha MRAA suppression in the threat condition relative to neutral, the greater the PTSS. These results provide evidence that threatening cues affect motor processing that is modulated by the severity of PTSS in victims of urban violence.

中文翻译:

隐藏的暴力创伤:异常的运动振荡大脑活动与创伤后应激症状有关

城市暴力的受害者有患上创伤后应激障碍 (PTSD) 的风险,这是暴力最令人衰弱的后果之一。考虑到 PTSD 可能与防御反应的低效选择有关,了解运动处理和 PTSD 之间的关系很重要。本研究旨在调查创伤后应激症状 (PTSS) 的严重程度与城市暴力受害者针对视觉威胁线索的运动准备相关的程度。参与者执行选择反应时间任务,同时忽略可能具有威胁性或中性的图片。提取的脑电图指标是 alpha 频率范围内的运动相关振幅不对称 (MRAA) 和侧向准备电位 (LRP)。我们观察到较长的 LRP 延迟和较慢的反应时间之间存在线性关系,在低 PTSS 的威胁处理期间(与中性相比)有选择性,但在高 PTSS 参与者中则不然。Alpha MRAA 抑制和 PTSS 也呈线性相关:相对于中立的威胁条件下的 alpha MRAA 抑制越小,PTSS 越大。这些结果提供证据表明,威胁线索会影响由城市暴力受害者 PTSS 严重程度调节的运动处理。
更新日期:2021-01-01
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