Challenges in Transforming Military Training: Research and Application of Advanced Simulation and Training Technologies and Methods

This study addresses the need to validate estimates of cross-job retraining times against measures of actual retraining success. Specialty-level cross-job retraining time estimates were computed for 43 U.S. Air Force (USAF) enlisted specialties. The estimates were based on profiles of mean subject- matter-expert ratings of months to proficiency across 26 task categories. Individual-level criteria indicating previous job skill utilization, current skills and abilities, and current job performance were obtained from a separate study conducted 10 years earlier. Results were supportive: Correlations between retraining time estimates and performance criteria were negative and statistically significant. Future research needs and potential applications of retraining time estimates are discussed.     

Posttraumatic Growth, Posttraumatic Stress Symptoms and Mental Health Among Coronary Heart Disease Survivors

The present study aimed to estimate posttraumatic stress symptoms (PTSS) and posttraumatic growth (PTG) among heart disease survivors and examine whether PTG moderates the association between PTSS and mental health. Data from 82 myocardial infarction and acute coronary artery bypass graft survivors (aged 46–82) was obtained at admission to a cardiac rehabilitation unit. Mental status was assessed by the PTSD Inventory, Posttraumatic Growth Inventory (PTGI), Mental Health Inventory and Health Related Quality of Life (HRQOL). 17.1 % of the participants suffered significantly from PTSS and most of the study sample (71.2 %) reported PTG. PTSS were positively associated with PTG and psychological distress and negatively with well-being and HRQOL. PTG moderated the association between PTSS and most mental health outcomes. We conclude that posttraumatic growth may attenuate the negative effect of posttraumatic stress symptoms on mental health.     

Short-term memory stages in sign vs. speech: the source of the serial span discrepancy

Speakers generally outperform signers when asked to recall a list of unrelated verbal items. This phenomenon is well established, but its source has remained unclear. In this study, we evaluate the relative contribution of the three main processing stages of short-term memory – perception, encoding, and recall – in this effect. The present study factorially manipulates whether American Sign Language (ASL) or English is used for perception, memory encoding, and recall in hearing ASL-English bilinguals. Results indicate that using ASL during both perception and encoding contributes to the serial span discrepancy. Interestingly, performing recall in ASL slightly increased span, ruling out the view that signing is in general a poor choice for short-term memory. These results suggest that despite the general equivalence of sign and speech in other memory domains, speech-based representations are better suited for the specific task of perception and memory encoding of a series of unrelated verbal items in serial order through the phonological loop. This work suggests that interpretation of performance on serial recall tasks in English may not translate straightforwardly to serial tasks in sign language.     

ERP correlates of performance monitoring in elderly

Previous studies on performance monitoring repeatedly found attenuated error-related negativities (Ne/ERN) in elderly, while findings for the correct-related negativity (Nc/CRN) are inconsistent. The present study aimed at clarifying inconsistent Nc/CRN results in elderly. Therefore, a refined design was employed to control for potential influences on the Nc/CRN, namely decision uncertainty and partial error processing. Further, we intended to study Nc/CRN variations with trial compatibility that were found in previous studies for younger but not for older adults. Results revealed increased Nc/CRN and decreased Ne/ERN amplitudes in older compared to younger adults. While the Ne/ERN was larger than the Nc/CRN in younger adults, both components were similar-sized in older adults. Further, a modulation of Nc/CRN amplitudes between compatible and incompatible trials was observed in younger adults, but was absent in older adults. Reduced differentiation of response-related negativities with response accuracy or stimulus compatibility in elderly suggests a reduced adaptation of associated processes to changing demands. Further, this might also point to different processes reflected by Nc/CRN and Ne/ERN and to reduced error-specific monitoring but increased general or strategic monitoring in elderly.     

Alcohol intoxication and memory for events: a snapshot of alcohol myopia in a real-world drinking scenario

Alcohol typically has a detrimental impact on memory across a variety of encoding and retrieval conditions (e.g., Mintzer, 2007; Ray & Bates, 2006). No research has addressed alcohol's effect on memory for lengthy and interactive events and little has tested alcohol's effect on free recall. In this study 94 participants were randomly assigned to alcohol, placebo, or control groups and consumed drinks in a bar-lab setting while interacting with a "bartender". Immediately afterwards all participants freely recalled the bar interaction. Consistent with alcohol myopia theory, intoxicated participants only differed from placebo and control groups when recalling peripheral information. Expanding on the original hypervigilance hypothesis, placebo participants showed more conservative reporting behaviour than the alcohol or control groups by providing more uncertain and "don't know" responses. Thus, alcohol intoxication had confined effects on memory for events, supporting and extending current theories.     

Reactivity to Stress: When Does a History of Medical Adversity Foster Resilience Versus Vulnerability?

Young adults with (or without) a history of medical or physical disorders (MPDs) were exposed to repeated laboratory stress. The effects of MPD status on habituation (as measured by changing levels of cortisol) were found to be moderated by the extent to which respondents reported “attachment feelings” in their relationships (as measured by the Social Provisions Scale). Students in the MPD group who reported attachment feelings showed (a) cortisol increases during their first exposure to a laboratory stressor; and (b) cortisol decreases during a second exposure to the same stressor 1 week later. No equivalent benefit was found for students who lacked this medical history. Findings suggest the extent to which medical adversity—under the right interpersonal circumstances—promotes resilience.     

Increases in parental investment and child health as a result of an early intervention

Parental investment (involving time or money invested in 3-year-olds) and child health were assessed as an outcome of (a) children’s risk status (preterm vs. full-term birth) and (b) maternal resources (defined here in terms of their problem-solving skills in resolving caregiving challenges). Resources were varied systematically as a function of maternal participation in a traditional home visitation program versus a novel cognitively enhanced program that facilitated parenting skills more successfully. As predicted, mothers in the traditional home visitation condition invested preferentially in low-risk children, whereas mothers in the cognitively enhanced condition invested preferentially in high-risk children (who, in turn, showed maximal health benefits). Maternal investment of time in care provision mediated the relationship between predictor variables and children’s health. This pattern supports an evolutionary model of parental investment in which parents show discriminative solicitude based on the reproductive potential of the child and parents’ access to relevant resources.     

Subjective randomness and natural scene statistics

Accounts of subjective randomness suggest that people consider a stimulus random when they cannot detect any regularities characterizing the structure of that stimulus. We explored the possibility that the regularities people detect are shaped by the statistics of their natural environment. We did this by testing the hypothesis that people’s perception of randomness in two-dimensional binary arrays (images with two levels of intensity) is inversely related to the probability with which the array’s pattern would be encountered in nature. We estimated natural scene probabilities for small binary arrays by tabulating the frequencies with which each pattern of cell values appears. We then conducted an experiment in which we collected human randomness judgments. The results show an inverse relationship between people’s perceived randomness of an array pattern and the probability of the pattern appearing in nature.