Post-traumatic stress disorder symptom severity in service members returning from Iraq and Afghanistan with different types of injuries

IntroductionRisk for post-traumatic stress disorder (PTSD) varies in part due to the nature of the traumatic event involved. Both injury and return from combat pose high risk of PTSD symptoms. How different injuries may predispose towards PTSD is less well understood. METHODS: A retrospective record review was conducted from 1402 service members who had returned to Naval Medical Center San Diego from Iraq or Afghanistan and who had completed the PTSD Checklist as part of their post-deployment screening. Rates of PTSD were examined in relation to mechanism of injury. RESULTS: Of those without injury, 8% met Diagnostic and Statistical Manual criteria for PTSD. Thirteen percent of those with a penetrating injury, 29% with blunt trauma, and 33% with combination injuries met criteria for PTSD. PTSD severity scores varied significantly according to type of injury.DiscussionThe World War I concept of "shell shock" implied that blast-related injuries were more likely to result in psychological symptoms than were other injuries. These data may support that idea. Circumstance of injury, population differences, and reporting bias could also have influenced the results.ConclusionThese results suggest that service members with blunt or combination injuries merit particular attention when screening for PTSD.     

PC-PVT: A platform for psychomotor vigilance task testing,analysis, and prediction

Using a personal computer (PC) for simple visual reaction time testing is advantageous because of the relatively low hardware cost, user familiarity, and the relative ease of software development for specific neurobehavioral testing protocols. However, general-purpose computers are not designed with the millisecond-level accuracy of operation required for such applications. Software that does not control for the various sources of delay may return reaction time values that are substantially different from the true reaction times. We have developed and characterized a freely available system for PC-based simple visual reaction time testing that is analogous to the widely used psychomotor vigilance task (PVT). In addition, we have integrated individualized prediction algorithms for near-real-time neurobehavioral performance prediction. We characterized the precision and accuracy with which the system as a whole measures reaction times on a wide range of computer hardware configurations, comparing its performance with that of the “gold standard” PVT-192 device. We showed that the system is capable of measuring reaction times with an average delay of less than 10 ms, a margin of error that is comparable to that of the gold standard. The most critical aspect of hardware selection is the type of mouse used for response detection, with gaming mice showing a significant advantage over standard ones. The software is free to download from http://bhsai.org/downloads/pc-pvt/.     

Leader-Member Exchange and Employee Creativity: Test of a Multilevel Moderated Mediation Model

Using multisource data, this article examined the relationship of two types of employee perceptions of overall fairness (i.e., fairness of the organization and fairness of the department), with supervisor ratings of in-role task performance and organizational citizenship behaviors (OCB). We also examined whether high-quality leader-member exchange (LMX) relationships compensate for negative effects of fairness on job performance and citizenship behaviors. Focusing on a sample of 154 health care workers, we found that only employee perceptions of overall fairness regarding the department were related to supervisory ratings of OCB and in-role task performance. Moreover, LMX moderated the relationships between fairness perceptions and (a) task performance, (b) organization-focused OCB, but not (c) individual-focused OCB. We discuss implications for research and the potential for reducing negative effects of low fairness perceptions on job performance through positive LMX.     

The myth of individualism-collectivism: a critical review

The authors critically assess the dimension of individualism-collectivism (I-C) and its various uses in cross-cultural psychology. They argue that I-C research is characterized largely by insufficient conceptual clarity and a lack of systematic data. As a result, they call into question the utility of I-C as an explanatory tool for cultural variation in behavior, suggest alternative dimensions for cross-cultural research, and interpret the weaknesses of research on I-C as illustrative of a general trend in social psychology.     

Locus of control and career self-management among nonsupervisory employees in industrial settings

The effects of locus of control on career self-management and career experiences of nonsupervisory workers were examined in different organizational environments. In organizational settings which encouraged personal initiative in career development through personnel policies and promotion practices. Internals played a more active role in their career progress than Externals by initiating their own job searches, and they had more favorable career experiences. In situations which hampered self-initiative, locus of control had little effect on career self-management and subsequent job experiences.     

Variables determining the effects of delay in reinforcement,

Procedures were discovered for maintaining a small fixed-ratio performance under 24-hr delay in reinforcement, by appropriate manipulation of the length of delay, amount of food delivered, and size of the fixed ratio. Other experiments showed that (1) the parameters discovered in the first experiment could produce the same result without the complex history of the first procedures; (2) the same parameters of the delayed-reinforcement procedure could maintain an explicit chain of responses; (3) gradual increase in the delay in reinforcement from small to large values was not a necessary condition for achieving the major result, if large amounts of food were delivered as reinforcement and all of the behaviors were first under good control of the relevant stimuli with short delays.     

Event-related potentials in a two-interval forced-choice detection task

In an attempt to elucidate the nature of the subject’s strategy in a two-interval forcedchoice auditory detection task, event-related potentials were studied at two intensities which yielded mean accuracies of 82% and 98%. Subjects reported the observation interval in which they judged the signal to be present and the confidence of the judgment. Principal components varimax analyses yielded four components: a CZ maximal P300, a Slow Wave, a slow negative shift, and a late negative component. The P300 amplitude findings suggest that different strategies are utilized for high-confidence and low-confidence detections. At high confidence, P300 amplitude is large for the observation interval in which the signal is presented, indicating a strategy involving serial independent detection. However, the P300 latency findings at high confidence suggest that absence of the signal in the first observation interval is nonetheless noted: P300 latency in response to signal presence is shorter for the second observation interval than for the first observation interval. At low confidence, P300 is small or absent for both observation intervals, indicating a deferred decision, presumably arrived at through comparison of the two percepts.     

Quiz-o-Matic: A free Web-based tool for construction of self-scoring on-line quizzes

Increasingly, educators are using the World-Wide Web (the Web) and related technology to supplement their traditional teaching materials. In this paper, we present a free tool that has been placed on the Web to enable educators to create Web pages that present self-scoring quizzes. Such Web-based practice quizzes provide students with an opportunity for interactive assessment and review of course material. The tool, Quiz-o-Matic, uses active server pages to build the HTML and JavaScript code for each quiz, without requiring the user to edit any code. We present evidence that students judge the self-scoring quizzes to be useful and worthwhile additions to a course.     

“Sandwiched generation” couples: A cross-cultural,cross-gender comparison

Maintaining a job while managing family responsibilities has become a major issue for much of today's workforce. Working couples who care both for dependent children and aging parents constitute a fast growing and understudied group called “the sandwiched generation.” Because of their multiple roles, these workers tend to be highly stressed and likely to have burnouts. The article presents the results of an exploratory study that compared 40 Israeli “sandwiched generation” couples living on a kibbutz, 80 Israeli couples living in small towns and 75 American men and women. The methodology involved a self-report questionnaire that included measures of social support, work–family conflict (WFC) and burnout. The findings revealed both cross-cultural and cross-gender differences: Americans reported higher WFC than Israelis whereas Israelis reported higher family–work conflict (FWC) than Americans. In addition, men received more support from their spouse than women with both work and family problems, Israelis received more help from their spouse with both home and work problems than Americans, and Israeli kibbutz members received more help from their spouse with both home and work problems than Israeli city dwellers. Support from the spouse for both work and home problems was found to be negatively correlated with burnout. These findings, as tentative as they are, demonstrate the theoretical and practical importance of studying “sandwiched generation” couples.