The role of hyperarousal in the manifestation of posttraumatic psychological distress following injury

The authors examined the temporal relation among posttraumatic stress disorder symptom clusters, using data derived from a longitudinal study of survivors of orofacial injury (N = 264). They conducted cross-lagged panel analyses, with self-reported symptom data collected at 1, 6, and 12 months postinjury. Results demonstrate that hyperarousal was a potent predictor of subsequent symptoms of reexperiencing and avoidance as well as hyperarousal. By contrast, neither reexperiencing nor avoidance was significantly related to other symptom clusters other than themselves over time. These findings underscore the distinctive nature of hyperarousal in the manifestation of posttraumatic psychological distress over time. Implications for theory, clinical intervention, and future research are discussed.     

The key role of nanoscale surface facets on the mechanical strength and failure of wurtzite and periodically twinned zinc-blende nanowires

Using molecular dynamics, we study the role of the surface facets of III–V nanowires on their failure during tensile deformation. We find that wurtzite (WZ) nanowires can withstand higher levels of stress and strain at failure compared to zinc-blende (ZB) nanowires. We observe that it is easier to nucleate a crack on a ZB nanowire due to the stress singularities that occur at the intersection of two opposing {111} facets. In WZ nanowires, we observe that cracks always nucleate at the intersection between two adjacent {112} surface facets. We explain these phenomena using fracture mechanics techniques based on energetics of crack formation.     

A Comparison of Latent Inhibition and Learned Irrelevance Pre-Exposure Effects in Rabbit and Human Eyeblink Conditioning

The learning of an association between a CS and a US can be retarded by unreinforced presentations of the CS alone (termed latent inhibition or LI) or by un-correlated presentations of the CS and US (termed learned irrelevance or LIRR). In rabbit eyeblink conditioning, there have been some recent failures to replicate LI. LIRR has been hypothesized as producing a stronger retardation effect than LI based on both empirical studies and computational models. In the work presented here, we examined the relative strength of LI and LIRR in eyeblink conditioning in rabbits and humans. In both species, a number of preexposure trials sufficient to produce LIRR failed to produce LI (Experiments 1 & 3). Doubling the number of CS pre-exposures did produce LI in rabbits (Experiment 2), but not in humans (Experiment 4). LI was demonstrated in humans only after manipulations including an increased inter-trial interval or ITI (Experiment 5). Overall, it appears that LIRR is a more easily producible pre-exposure retardation effect than LI for eyeblink conditioning in both rabbits and humans. Several theoretical mechanisms for LI including the conditioned attention theory, stimulus compression, novelty, and the switching theory are discussed as possible explanations for the differences between LIRR and LI. Overall, future work involving testing the neural substrates of pre-exposure effects may benefit from the use of LIRR rather than LI.     

Analyzing Big-Five Personality Traits of Indian Celebrities Using Online Social Media

Personality traits analysis has been an active area of research in information systems and its cognate disciplines. However, there are multiple challenges faced by questionnaire-based measurement of personality traits including low response rate and limited access to the individuals. This research paper presents a social media-based approach to determine the Big-Five personality traits of different groups of celebrities. First, authors collected the Twitter posts of celebrities in different professions and used IBM’s Watson Personality Insights tool to determine the personalities of these celebrities. Next, with the help of statistical analysis and visualization techniques, authors determined the personality pattern within and across the group of celebrities. The results demonstrate that there is significant difference across groups of celebrities on three of the Big-Five personality traits—Openness, Agreeableness, and Extraversion. However, there is no significant difference among the celebrity groups on the Conscientiousness and Neuroticism trait.     

Suicidality, clinical depression, and anxiety disorders are highly prevalent in men who have sex with men in Mumbai, India: findings from a community-recruited sample

In India men who have sex with men (MSM) are a stigmatized and hidden population, vulnerable to a variety of psychosocial and societal stressors. This population is also much more likely to be HIV-infected compared to the general population. However, little research exists about how psychosocial and societal stressors result in mental health problems. A confidential, quantitative mental-health interview was conducted among 150 MSM in Mumbai, India at The Humsafar Trust, the largest non-governmental organization serving MSM in India. The interview collected information on sociodemographics and assessed self-esteem, social support and DSM-IV psychiatric disorders using the Mini International Neuropsychiatric Interview (MINI). Participants' mean age was 25.1 years (SD?=?5.1); 21% were married to women. Forty-five percent reported current suicidal ideation, with 66% low risk, 19% moderate risk, and 15% high risk for suicide per MINI guidelines. Twenty-nine percent screened in for current major depression and 24% for any anxiety disorder. None of the respondents reported current treatment for any psychiatric disorder. In multivariable models controlling for age, education, income, and sexual identity, participants reporting higher levels of self-esteem and greater levels of satisfaction with the social support they receive from family and friends were at lower risk of suicidality (self-esteem AOR?=?0.85, 95% CI: 0.78-0.93; social support AOR?=?0.76, 95% CI: 0.62-0.93) and major depression (self-esteem AOR?=?0.79, 95% CI: 0.71-0.89; social support AOR?=?0.68, 95% CI: 0.54-0.85). Those who reported greater social support satisfaction were also at lower risk of a clinical diagnosis of an anxiety disorder (AOR?=?0.80; 95% CI: 0.65-0.99). MSM in Mumbai have high rates of suicidal ideation, depression, and anxiety. Programs to improve self-esteem and perceived social support may improve these mental health outcomes. Because they are also a high-risk group for HIV, MSM HIV prevention and treatment services may benefit from incorporating mental health services and referrals into their programs.     

Expectation confirmation: An examination of three competing models

We discuss three theoretical models from met expectations research in the fields of organizational behavior and consumer psychology. Based on the fundamental arguments in the models, we term these models: disconfirmation, ideal point, and experiences only. We present three-dimensional graphical and analytical representations of the models, with satisfaction being a function of expectations and experiences. We tested the models in the context of a new information system implementation in an organization, with expectations, experiences, and system satisfaction measured for both ease of use and usefulness, the focal constructs of the Technology Acceptance Model (TAM). We found that an experiences only model in which expectations had no measurable effect best explained the data for ease of use. The results for usefulness indicated a modified version of the experiences only model in which the positive effect of experiences becomes slightly stronger—i.e., more positive—as expectations increase.     

Role of time in self-prediction of behavior

This paper examines three specific manifestations of time—anticipation (proximal vs. distal), prior experience with the behavior, and frequency (episodic vs. repeat)—as key contingencies affecting the predictive validity of behavioral intention, perceived behavioral control, and behavioral expectation in predicting behavior. These three temporal contingencies are examined in two longitudinal field studies: (1) study 1—a 6-month study of personal computer (PC) purchase behavior among 861 households and (2) study 2—a 12-month study among 321 employees in the context of a new technology implementation in an organization. In study 1, where the episodic behavior of PC purchase was examined, we found that increasing anticipation (i.e., more distal) weakened the relationship between behavioral intention and behavior and strengthened the relationship between behavioral expectation and behavior. In contrast, increasing experience strengthened the relationship between behavioral intention and behavior and weakened the relationship between behavioral expectation and behavior. In study 2, where the repeat behavior of technology use was examined, we found two significant 3-way interactions: (1) the relationship between behavioral intention and behavior was strongest when anticipation was low (i.e., proximal) and experience was high and (2) the relationship between behavioral expectation and behavior was strongest when anticipation was high (i.e., distal) and experience was low.     

The Chemical and Biological Warfare Environment: Psychological Responses and Social Supports in a High-Stress Environment

In order to better understand psychological responses to high-stress environments and the contributions of social supports to mediating the effects of this stress, we conducted a preliminary investigation of a health care delivery team in a simulated chemical and biological warfare (CBW) environment. Our data suggest that state anxiety prior to the exercise, perceived social support from family and friends, and active training stand out as predictors of psychological outcome, even after trait and pre-exercise psychological variables are considered. Interventions directed at state anxiety and active training may offer mechanisms to decrease the psychological distress of the high-stress environment. Future research should examine variables which are amenable to intervention to determine if they are causally related to health outcome in high-stress environments.     

Ethical Value Positioning of Management Students of India and Germany

This study attempts to compare ‘the ethical value positioning’ of students of Business and Management studies from India and Germany. A complete enumerative survey was conducted for management students using the Ethical Positioning Questionnaire (EPQ) of Forsyth (1980). There were 134 respondents from India and 57 from Germany. The objective was to confer the differences in ethical positioning of students of two economically and culturally diverse nations. By the end of the research, it was constituted that both German and Indian students demonstrate a high degree of Idealism and Relativism and can be qualified as situationists. Exploratory analysis of the responses resulted in extraction of four factors (values): Non-Violence, Individualism, Non-Consequential, and Situational value. Within the analysis, Indian students displayed a higher preference for Individualism compared to their German counterparts. This study contributes to the literature in cross-cultural ethical value positioning of young managers. This study also opens a window for future research in the factors such as educational qualification, closed social groupings, and background of the students.