This study examined cognitive and experiential patterns in the trauma narratives of 42 survivors (74% women; Mage = 42.1) of the Route 91 Harvest Festival shooting, the deadliest mass shooting in modern American history. We conducted a codebook thematic analysis of written narratives collected within one month of the event. We developed four themes: contextual memory (sensory-perceptual features, time, and space), physical injury, heroism, and contemplating mortality. Survivors recalled vivid sensory impressions, detailed spatial awareness organized around escape, and temporal distortions, including both subjective slowing and sequence gaps. Accounts of graphic injury, prosocial action under fire, and direct confrontation with death further structured the narratives. Limitations include prompted rather than free recall, written self-report allowing revision, and a predominantly female sample. These findings add to the scant literature on mass-shooting survivors' memories.

Shedding light on the validity of sentence completion test (SCT) verbal defensiveness as an index of defensive behavior, the current two-part study examined the relationship between psychological threat and verbal defensiveness among military security and mission-critical team candidates using SCTs. Our study showed that as the threatening nature of SCT stems increased, defensive responses also increased, substantiating the link between psychological threat and defensive behavior. In addition, expert ratings of stem content revealed moderately strong relationships with defensive responses across two different SCTs, irrespective of their structural characteristics. In contrast to previous studies using total verbal defensiveness scores, we examined specific defensive response types and their associations with stem threat ratings, finding that omissions, denial, and comments about the test were linked to stem threat levels. Lastly, our study extends the application of the SCT verbal defensiveness index beyond specialized personnel selection, finding no significant differences in verbal defensiveness based on gender or military status. Overall, these findings contribute to a comprehensive understanding of defensive behavior and its contextual variations.

The current study explored the relationship between the Dark Core of personality and the General Factor of Personality (GFP), employing two samples. Sample 1 included 1066 adults from three U.S. universities, assessed with the HEXACO-100 and Short Dark Triad, while Sample 2 comprised 1052 Amazon Mechanical Turk workers, evaluated with Dark Triad measures and the IPIP-NEO-120. We used confirmatory factor analysis, principal component analysis, and principal axis factoring to examine the structure of the GFP and Dark Core and their interrelation. Our findings revealed distinct yet interrelated higher-order structures, with negative correlations characterizing the relationship between the Dark Core and GFP. This study aids in understanding complex personality dynamics, highlighting the need to consider adaptive and maladaptive traits in research. The findings have implications for refining personality models and shed light on the coexistence of constructive and destructive traits in individuals. Future research should further investigate these constructs in diverse samples using multifaceted assessment approaches to deepen our grasp of personality structure and its behavioral impact.

The current two-part study examined SCT verbal defensiveness as a predictor of assessment and selection outcome among high-risk operational and military security program candidates. In addition, we examined the relationship between SCT verbal defensiveness and personality, as well as general cognitive ability. Candidates higher in SCT verbal defensiveness were less likely to be selected in both programs. SCT verbal defensiveness was negatively correlated with Extraversion, Agreeableness, and Conscientiousness, as well as other indices of behavioral dysregulation on the PAI, suggesting greater behavioral unreliability in those high in SCT verbal defensiveness. Data in both samples revealed no significant correlation between SCT verbal defensiveness and general cognitive ability. Overall, results suggest that SCT verbal defensiveness reflects situational demands and "darker" personality characteristics.

The present study was performed to test whether acute stress exposure would significantly increase human compliance and suggestibility. One hundred active duty military participants enrolled in military survival school training were randomized to receive the Gudjonsson Compliance and Suggestibility Scales (GCS and GSS) prior to, during or after exposure to interrogation stress. All participants were also assessed prior to, and after stress exposure for symptoms of dissociation. Stress exposure significantly increased compliance in individuals who exhibited a pre-stress propensity to dissociation; stress exposure significantly increased suggestibility. These data support the view that some individuals are more likely than others to experiencing an increase in compliance and in suggestibility if exposed to interrogation stress. These data also suggest that individuals who are vulnerable to stress induced increases in suggestibility and compliance can be identified using psychological measures of dissociation.

Numerous studies have examined the effects of captivity survival training on psychological and physiological function in trainees. In the present study we shifted the focus to instructors, and measured the effects that the delivery of training exerts on their levels of stress and performance. Because instructors are called upon to perform difficult duties (e.g., mock interrogations) under extreme conditions, we hypothesized that significant increases in psychological and physiological indices of stress would occur due to training. In addition, as part of their job tasking, the instructors conducted courses in consecutive weeks. This offered a unique and ecologically valid opportunity to assess carryover of stress from one week to the next. We hypothesized stress levels would be higher in the second than the first week of training. Our first hypothesis was supported: Delivering training was associated with impairments in mood, fatigue, and sleep, as well as a reduction in the ratio of testosterone/cortisol level in blood. Our second hypothesis was largely not supported as a 3-day break separating consecutive courses appeared sufficient for restoring psychological and physiological function. Our results demonstrate that although the delivery of training exerts negative effects on instructors' levels of stress, the 3-day recovery period separating consecutive courses is sufficient to return psychological and physiological function to baseline levels.

In the Canadian Armed Forces (CAF), Conduct After Capture (CAC) training is a 4-day captivity survival course during which soldiers are exposed to increasing stress, and evaluated on their ability to accomplish military objectives. We hypothesized that: (a) compared to baseline, CAC training would cause significant, reversible perturbations in measures of psychological functioning and serum and salivary stress hormone levels relevant to models of stress hardiness and vulnerability; and (b) deviations from baseline would be maximal at the time point of most intense stress during training. CAF personnel were assessed at baseline, twice during training (immediately prior to a less challenging interrogation role-play scenario and again following another much more intense interrogation role-play scenario), and after completion of training. At each occasion, mood, fatigue, dissociation, PTSD symptoms, short-term and working memory, and salivary cortisol and dehydroepiandrosterone (DHEA) were assessed. As predicted, scores on all measures were degraded during CAC but recovered after completion of training, and almost all measures were most degraded at the more intense interrogation role-play scenario. Unexpectedly, memory performance was unaffected by training, suggesting that a short duration of intense stress might be insufficient for degrading it. Another unexpected finding was that mood assessed prior to training predicted successful completion of training, which bears important practical implications for increasing the success rate of training in similar environments. These results demonstrate that despite its relative brevity, CAC training nevertheless induces significant but reversible effects on psychological and physiological function-necessary preconditions for stress inoculation training.

Can the onset of PTSD symptoms and depression be predicted by personality factors and thought control strategies? A logical explanation for the different mental health outcomes of individuals exposed to trauma would seem to be personality factors and thought control strategies. Trauma exposure is necessary but not sufficient for the development of PTSD. To this end, we assess the role of personality traits and coping styles in PTSD vulnerability among Israeli and Palestinian students amid conflict. We also determine whether gender and exposure level to trauma impact the likelihood of the onset of PTSD symptoms. Five questionnaires assess previous trauma, PTSD symptoms, demographics, personality factors and thought control strategies, which are analyzed using path analysis. Findings show that the importance of personality factors and thought control strategies in predicting vulnerability increases in the face of political violence: the higher stress, the more important the roles of personality and thought control strategies. Thought control strategies associated with introverted and less emotionally stable personality-types correlate positively with higher levels of PTSD symptoms and depression, particularly among Palestinians. By extension, because mental health is key to reducing violence in the region, PTSD reduction in conflict zones warrants rethinking.

In this study, we tested whether modified cognitive interviewing (MCI) is a valid method for distinguishing between genuine and deceptive human eyewitness accounts.102 healthy military personnel were the participants of this study.54 were assigned to a manual task condition and 48 to a cognitive task condition.Of the 54 assigned to the manual task, 17 truly performed the task and were truthful when interviewed about their activities; 18 performed the task and, when interviewed denied having performed the task; 19 read the instructions regarding the manual task and when interviewed falsely claimed to have performed the task.Of the 48 participants assigned to the cognitive task, 20 performed the task and reported truthfully about their activities; 13 performed the task and denied having participated in the task; 15 read the instructions about the cognitive task and when interviewed claimed to have actually performed the task.The transcripts of interviews were rated by individuals trained in cognitive interviewing; forensic speech variables (response length, unique word count and type-token ratio (TTR)) were coded from transcripts.Human rater judgments and computer-based speech analysis performed better than chance; computer based judgments were superior to the human judgments (i.e., 80% vs. 62%, respectively).Speech content variables derived from MCI differed significantly, and in different ways, between the truthful and false claimant participants and also between the truthful and denial type participants.MCI derived statement analysis methods are a scientifically valid method that can be used by professionals tasked with distinguishing between true claims, false claims and denials.

The goal of the present study was to characterize the effects of an acutely stressful situation on attentional orienting to social cues. Participants were tested before and during a highly stressful military training course. During the task, participants shown faces at fixation that concurrently displayed dynamic gaze shifts and expression changes from neutral to fearful or happy emotions. Military-relevant targets subsequently appeared in the periphery and were spatially congruent or incongruent with the gaze direction. Participants showed faster responses during fearful face trials during the high stress condition compared to baseline, while the response on happy face trials did not change. Additionally, enhanced performance was related to self-report reappraisal use during emotion regulation at baseline. Reaction times to threatening targets were faster on validly cued trials during both tests. Trials with safe targets showed no differences at baseline. These results suggest that acute stress plays a role in how individuals respond in the presence of a fearful cue, and during the evaluation of potentially threatening targets.

A growing number of research findings have challenged the conception that memory for traumatic events is highly accurate or even indelible in nature. Research involving soldiers indicates that realistic levels of high stress decrease the accuracy of eyewitness memory. In addition, recent findings from several studies show quite clearly that memories for stressful events - including those from combat trauma - are malleable and vulnerable to alteration by exposure to misinformation. Under high stress, our brains facilitate the formation of "gist" memories that allow us to avoid future dangers but which may not contain the detail and precision demanded by the judicial system. Although mental health professionals ought to play a role in educating the courts about mental illness and trauma, it is unwise for them to become advocates for the idea that traumatic memories are indelible, factual accounts of events.

Evidence points to heightened physiological arousal in response to acute stress exposure as both a prospective indicator and a core characteristic of posttraumatic stress disorder (PTSD). Because females may be at higher risk for PTSD development, it is important to evaluate sex differences in acute stress reactions. This study characterized sex differences in cardiovascular and subjective stress reactions among military survival trainees. One hundred and eighty-five military members (78% males) were studied before, during, and 24 h after stressful mock captivity. Cardiovascular (heart rate [HR], systolic blood pressure [SBP], diastolic blood pressure [DBP]) and dissociative states were measured at all three time points. Psychological impact of mock captivity was assessed during recovery. General linear modeling with repeated measures evaluated sex differences for each cardiovascular endpoint, and causal steps modeling was used to explore interrelationships among sex, cardiovascular reactions and psychological impact of mock captivity. Although females had lower SBP than males at all three time points, the difference was most pronounced at baseline and during stress. Accordingly, females showed greater residual elevation in SBP during recovery. Females had lower DBP at all three time points. In addition, females reported greater psychological impact of mock captivity than males. Exploratory causal steps modeling suggested that stress-induced HR may partially mediate the effect of sex on psychological impact of mock captivity. In conclusion, this study demonstrated sex-specific cardiovascular stress reactions in military personnel, along with greater psychological impact of stress exposure in females. This research may elucidate sex differences in PTSD development.

The purpose of this project was to assess the detecting deception efficacy of three well-validated "detecting deception" methods - i.e., forced choice testing (FCT), modified cognitive interviewing (MCI) and autobiographical implicit association testing (aIAT) - when applied to the issue of bio-threat. The detecting deception accuracies of FCT and MCI were 81% and 75%, respectively. Although the aIAT mean response times in block 5 differed significantly between deceptive and truthful persons, the classification accuracy was low. FCT alone reduced the group of 64 persons to 11 and detected 50% of the liars; the false positive rate was 9%. MCI alone reduced the group of 64 to 24 and detected 92% of the liars; the false positive rate was 54%. When FCT was paired with MCI, 75% of liars were detected and the false positive rate was 13%. Forced choice testing and MCI show promise as methods for detecting deception related to bio-threat under low-base-rate conditions. These methods took little time, enhanced the odds of detecting deceptive individuals and exhibited high positive likelihood ratios, suggesting that they have merit as screening tools. The aIAT required more time and was less accurate but may still serve as a useful screening tool.

We recently distinguished between spontaneous and deliberate dissociative states in military personnel exposed to stressful survival training, demonstrating not only that a substantial subset of participants (13%) deliberately dissociate under intense stress but also that most deliberate dissociators (76%) find it helpful (facilitative) to coping. In this brief report, we examine the relationship between spontaneous and deliberate subtypes of dissociation, and objective military performance in Special Forces and non-Special Forces personnel enrolled in survival school. Inverse relationships between dissociation and military performance were observed in both Special Forces and general soldier subgroups. Military performance did not differ between spontaneous and deliberate dissociators, nor did it differ between those who appraised dissociative states as facilitative versus debilitative to stress coping. This study evolves our understanding of factors influencing human performance in the high-stakes survival context.

A large body of research has demonstrated that exposure to misinformation can lead to distortions in human memory for genuinely experienced objects or people. The current study examined whether misinformation could affect memory for a recently experienced, personally relevant, highly stressful event. In the present study we assessed the impact of misinformation on memory in over 800 military personnel confined in the stressful, mock POW camp phase of Survival School training. Misinformation introduced after the negatively affected memory for the details of the event (such as the presence of glasses or weapons), and also affected the accuracy of identification of an aggressive interrogator. In some conditions more than half of the subjects exposed to a misleading photograph falsely identified a different individual as their interrogator after the interrogation was over. These findings demonstrate that memories for stressful events are highly vulnerable to modification by exposure to misinformation, even in individuals whose level of training and experience might be thought to render them relatively immune to such influences.