Rumination and threat-biased interpretation mediate posttraumatic stress and growth responses to military stressors.

We examined the role of rumination and threat-biased interpretation in stress and growth responses to military stressors. Two online surveys were completed by 183 (survey 1) and 393 (survey 2) currently serving or retired military personnel. The surveys measured exposure to potential military stressors (exposure to combat, witnessing the consequences of war, and perceived moral injury), posttraumatic stress symptomatology (PTSS), posttraumatic growth (PTG), and personal wellbeing, with survey 1 including measures of rumination, and survey 2 including a measure of threat-biased interpretation. Path analyses revealed that indirect paths from both witnessing the consequences of war and experiencing betrayal to PTSS were mediated by intrusive rumination and threat-biased interpretation, and that indirect paths from both betrayal and transgressions by others to PTG were mediated by deliberate rumination and threat-biased interpretation. The results reveal the idiosyncratic nature of military stressors, their differential involvement with cognitions that underpin rumination about past events and interpretation of current events, and their relevance to posttraumatic stress and growth in military personnel.

Posttraumatic stress, visual working memory, and visual imagery in military personnel.

Posttraumatic stress disorder (PTSD) is characterized by disruptions to cognitive functioning. Two studies were conducted to examine the relevance of military-related PTSD to two cognitive functions - visual working memory and visual imagery. Participants were military personnel who reported their PTSD diagnosis history and completed a self-administered screening tool for PTSD, the PTSD Checklist - Military Version. In Study 1, 138 personnel also completed a memory span task and a 2-back task using colored words in which Stroop interference was introduced via the semantic content of the words. In Study 2, a separate group of 211 personnel completed measures of perceived imagery vividness and spontaneous use of visual imagery. Interference effects on working memory in PTSD-diagnosed military personnel were not replicated. However, ANCOVA and structural equation modelling revealed that PTSD-intrusions were associated with poorer working memory whereas PTSD-arousal was associated with spontaneous use of visual imagery. We interpret these results as evidence that intrusive flashbacks disrupt working memory performance not by limiting memory capacity nor by interfering directly with memory functions such as inhibition, but by adding internal noise in the form of task-irrelevant memories and emotions. Visual imagery appears to be unrelated to these flashbacks but with arousal symptoms of PTSD, perhaps in the form of flashforwards about feared/anticipated threats.