Psychoneurogenic stress influences upon retention of an inhibitory avoidance response in the rat

Hormones and peptides involved in the response of an organism to stress play a modulating role in learning and memory processes. We studied whether psychoneurogenic stressors such as sound stimulation or novelty influence retention of an inhibitory avoidance response. An impairing effect on retention was observed when these stressors were applied shortly after the acquisition trial, but not after a 3-h delay. However, sound stimulation and novelty applied shortly before the retention test may facilitate retention behavior. It is suggested that the effect of psychoneurogenic stressors on retention behavior may be linked to influences on consolidation and retrieval processes mediated through the neurohumoral response of the organism to stress.     

Equivalent strain-hardening work theorem

A new physical concept, termed ‘equivalent strain-hardening work’, is proposed. The physical concept can be used to redefine the commonly used effective stress and effective strain theory as applied in constructing the constitutive relations of stress and strain, especially when related to an anisotropic strain-hardening material. The concept concerns that part of plastic work which emphasizes the action due to the strain-hardening behaviour of a material. Based on this concept, any one of the strain-hardening stress–strain curves obtained through common experiments on anisotropic materials can be selected as a nominally effective stress and an associated effective strain, and the rest of the strain-hardening relations can all be then transformed to be functions of variables of the nominally effective strain. Thus, any kind of loading path can be characterized by a single relation between effective stress and effective strain. When applied to the isotropic materials, the equivalent strain-hardening work concept is identical with the work-equivalent deformation concept but is more general.     

An acute application of transcranial random noise stimulation does not enhance motor skill acquisition or retention in a golf putting task

Transcranial random noise stimulation (tRNS) is a brain stimulation technique that has been shown to increase motor performance in simple motor tasks. The purpose was to determine the influence of tRNS on motor skill acquisition and retention in a complex golf putting task. Thirty-four young adults were randomly assigned to a tRNS group or a SHAM stimulation group. Each subject completed a practice session followed by a retention session. In the practice session, subjects performed golf putting trials in a baseline test block, four practice blocks, and a post test block. Twenty-four hours later subjects completed the retention test block. The golf putting task involved performing putts to a small target located 3 m away. tRNS or SHAM was applied during the practice blocks concurrently with the golf putting task. tRNS was applied over the first dorsal interosseus muscle representation area of the motor cortex for 20 min at a current strength of 2 mA. Endpoint error and endpoint variance were reduced across the both the practice blocks and the test blocks, but these reductions were not different between groups. These findings suggest that an acute application of tRNS failed to enhance skill acquisition or retention in a golf putting task.     

The linkages of cognitive processes, stress propensity, affect, and strain: experimental test of a cognitive model of the stress response

This research examined a model of the stress response that includes cognitive-affective stress propensity, cognitive-affective processes, experienced affective reactions, subjective stress, and strain constructs. Using partial least squares analysis, this model was found to provide a good fit with the data. Moderated multiple regression analyses found support for the hypothesized moderating effects of individual stress propensity on the relationships of stressors with cognitive-affective processes. The research and practical implications of these findings are discussed.     

Acceptance and Commitment Therapy for Anxiety Disorders: Three Case Studies Exemplifying a Unified Treatment Protocol

Acceptance and Commitment Therapy (ACT) is an innovative acceptance-based behavior therapy that has been applied broadly and successfully to treat a variety of clinical problems, including the anxiety disorders. Throughout treatment ACT balances acceptance and mindfulness processes with commitment and behavior change processes. As applied to anxiety disorders, ACT seeks to undermine excessive struggle with anxiety and experiential avoidance––attempts to down-regulate and control unwanted private events (thoughts, images, bodily sensations). The goal is to foster more flexible and mindful ways of relating to anxiety so individuals can pursue life goals important to them. This article describes in some detail a unified ACT protocol that can be adapted for use with persons presenting with any of the major anxiety disorders. To exemplify this approach, we present pre- and posttreatment data from three individuals with different anxiety disorders who underwent treatment over a 12-week period. The results showed positive pre- to posttreatment changes in ACT-relevant process measures (e.g., reductions in experiential avoidance, increases in acceptance and mindfulness skills), increases in quality of life, as well as significant reductions in traditional anxiety and distress measures. All three clients reported maintaining or improving on their posttreatment level of functioning.     

The Relation of Self‐Control Demands to Job Strain: The Moderating Role of Organisational Commitment

Drawing on recent theoretical developments in cognitive and social psychology, self‐control demands were introduced as a new source of stress at work. Affective organisational commitment was expected to operate as a buffer in the relation between self‐control demands and indicators of job strain. Data provided by 260 nurses in homes for elderly people revealed both significant relationships of self‐control demands and commitment to a broad spectrum of strain indicators that included not only self‐report measures (burnout, psychosomatic complaints, intentions of quitting), but also a measure of absenteeism. Self‐control demands were positively related to all indicators of job strain, whereas the associations were negative for affective commitment. In addition, the results provided clear evidence for the buffer hypothesis of commitment. The positive relations of high self‐control demands to all strain indicators were attenuated as a function of affective commitment. The results suggest that the buffer effect of commitment is mainly due to stress‐contingent appraisal processes rendering highly committed employees less vulnerable to the adverse effects of high stress.     

A lengthy look at the daily grind: time series analysis of events, mood, stress, and satisfaction

The present study investigated processes by which job stress and satisfaction unfold over time by examining the relations between daily stressful events, mood, and these variables. Using a Web-based daily survey of stressor events, perceived strain, mood, and job satisfaction completed by 14 university workers, 1,060 occasions of data were collected. Transfer function analysis, a multivariate version of time series analysis, was used to examine the data for relationships among the measured variables after factoring out the contaminating influences of serial dependency. Results revealed a contrast effect in which a stressful event associated positively with higher strain on the same day and associated negatively with strain on the following day. Perceived strain increased over the course of a semester for a majority of participants, suggesting that effects of stress build over time. Finally, the data were consistent with the notion that job satisfaction is a distal outcome that is mediated by perceived strain.     

The effect of ethanol on stress-induced tachycardia

A study was designed to answer the questions if low doses of ethanol would reduce stress induced increases in heart rates, if covariations would be observed between ethanol induced changes in heart rates and changes in emotional states and mental performance and if tolerance to ethanol or other personality factors would influence the ethanol induced cardiac effects. Forty-four male students with a history of high and low alcohol consumption according to questionnaire scores were matched for extraversion and neuroticism and then assigned to a group receiving either 0.8 g/kg of ethanol or a placebo drink. A stress condition of mental arithmetic was applied prior to and 45 minutes after ingestion of the drink. Heart rates and ratings of emotional states by adjective check lists were recorded before and after each stress session. A significant reduction of stress induced heart rate increases in both high and low drinking groups but no ethanol dependent change of resting heart rates were observed. Reductions of autonomic stress response by ethanol were weakly but positively correlated to respective reductions of affective stress responses and impairment of the quality of mental performance. High trait anxiety subjects seemed to benefit more from ethanol with respect to reductions of cardiac and emotional arousal than low anxious subjects.     

First interactions between hydrogen and stress-induced reverse transformation of Ni–Ti superelastic alloy

The first dynamic interactions between hydrogen and the stress-induced reverse transformation have been investigated by performing an unloading test on a Ni–Ti superelastic alloy subjected to hydrogen charging under a constant applied strain in the elastic deformation region of the martensite phase. Upon unloading the specimen, charged with a small amount of hydrogen, no change in the behaviour of the stress-induced reverse transformation is observed in the stress-strain curve, although the behaviour of the stress-induced martensite transformation changes. With increasing amount of hydrogen charging, the critical stress for the reverse transformation markedly decreases. Eventually, for a larger amount of hydrogen charging, the reverse transformation does not occur, i.e. there is no recovery of the superelastic strain. The residual martensite phase on the side surface of the unloaded specimen is confirmed by X-ray diffraction. Upon training before the unloading test, the properties of the reverse transformation slightly recover after ageing in air at room temperature. The present study indicates that to change the behaviour of the reverse transformation a larger amount of hydrogen than that for the martensite transformation is necessary. In addition, it is likely that a substantial amount of hydrogen in solid solution more strongly suppresses the reverse transformation than hydrogen trapped at defects, thereby stabilising the martensite phase.     

Treating bruxism with the habit-reversal technique

The habit-reversal technique developed by Azrin and Nunn (1973, 1977) was used in treating four clients with bruxism. Following a single treatment session, marked reductions in the frequencies of this behavior were obtained in each case. Subsequently, relaxation and stress management techniques were conducted with two of these clients who had facial pain. These procedures were associated with decreased pain ratings and medications for one client and a further decrease in bruxism and cessation of pain for the second. These results remained consistent over 6- and 12-month follow-ups. Each of the components of habit-reversal appeared to be related to its effectiveness, and methods for performing component analyses of this technique are described.     

Irradiation-enhanced twin boundary migration in BCC Fe

The effects of irradiation on twin boundary migration in BCC Fe are studied by atomistic simulations. It is found that under the applied shear strain–stress, thermal spikes may create twinning dislocation loops (TDLs) at twin boundaries, so triggering twinning. Irradiation-generated clusters of point defect at twin boundaries may act as sources to nucleate TDLs. When a vacancy loop intersects with a twin boundary, the critical stress to activate a TDL is less than half of that required for a defect-free twin boundary.     

When Time Is Money: Decision Behavior under Opportunity-Cost Time Pressure

Decison-making dilemmas can arise because errors may result either from deciding too soon or from delaying decisions too long. Delay can result in lost opportunities or reductions in payoffs from the most accurate decision. This paper investigates decision processes in environments where there is time stress due to the opportunity cost of delaying decisions. First, using computer simulation, the relative accuracy of alternative decision strategies is examined in environments that differ in terms of the levels of opportunity cost of delay. The lexicographic choice rule is shown to be a very attractive decision process in situations where there is opportunity-cost time pressure. Two experiments test the adaptivity of actual decision behavior to the presence or absence of opportunity-cost time pressure along with variations in goals (accuracy emphasized vs. effort savings emphasized), dispersion in probabilities or weights across the outcomes of the choice options, and the degree of correlation among the outcomes. Subjects were generally adaptive to opportunity-cost time pressure. However, failures in adaptivity were identified when choice environment properties with conflicting implications for adaptation were present simultaneously. In particular, under opportunity-cost time pressure, subjects received a lower expected payoff when the goal was to emphasize choice accuracy than when the goal was to emphasize savings in effort. The question of when adaptivity in decision making might fail is discussed.     

Addressing Anger,Stress, and Alcohol-Related Difficulties in the Military: An ACT Intervention

The use of alcohol to manage emotion is a common technique seen in military service personnel, the implication of which is evident in the relationship between alcohol misuse and mood disorders. However, investigations into transdiagnostic treatments aimed at addressing the common underlying processes to these problems in military personnel are lacking. The present study aimed to investigate the efficacy of a real-world Acceptance and Commitment Therapy (ACT)-based intervention undergone by 262 military personnel. A quasi-experimental prepost design was employed (interim 1 month postintervention) with a waitlist control group utilized to compare differences over time between those who promptly completed the week-long intervention course and the delayed waitlist participants. In line with predictions, the intervention group showed greater improvement (cf. preintervention waitlist group) in emotion management, and greater reductions in levels of alcohol consumption, aggression, anxiety, stress, and perceptions of others being responsible for their circumstances. No significant differences were found in the comparison of both groups’ 1-month postintervention results (i.e., both groups evidenced similar improvements); suggesting having to wait to start the course had little effect on its impact. The results suggest the course holds promise for helping military service personnel improve a range of psychosocial outcomes. Further testing with a more rigorous methodology is recommended, as is using a more proactive approach in the promotion and implementation of future courses.     

The impact of vacation and job stress on burnout and absenteeism

Abstract The purpose of the present study was to test the hypothesis that vacation relief decreases psychological and behavioral strains caused by job stressors. We examined the impact of job stress and vacation on strain on 87 blue-collar employees in an industrial enterprise in central Israel. Whereas former respite research focused on the impact of vacation only on psychological strains such as burnout and job and life satisfaction, the current study also examined a behavioral strain, absenteeism. The employees completed questionnaires before and after vacation and again four weeks later. Our findings show that vacation alleviated perceived job stress and bumout as predicted, replicating findings that a respite from work diminishes levels of strain to lower than chronic, on-the-job levels. We found declines in burnout immediately after the vacation and a return to prevacation levels four weeks later, and a similar pattern with regard to absenteeism.     

Dynamic properties of edge dislocations decorated by interstitial loops in α-iron and copper

Clusters of self-interstitial atoms (SIAs) in the form of parallel crowdions are created directly in high-energy displacement cascades produced in metals by neutron irradiation. They are equivalent to small perfect dislocation loops and, in isolation in pure metals, undergo fast thermally-activated glide in the direction of their Burgers vector. Their strain field and ability to glide allows long-range interaction with other extended defects. Indeed, dislocations decorated by dislocation loops are commonly observed after neutron irradiation. Dislocations gliding under applied stress also encounter these mobile defects. These effects influence mechanical properties and require further investigation. This paper presents results from an atomic-scale study of copper and α-iron at either 0?K or 300?K. Loop drag and breakaway effects are investigated for an edge dislocation under applied stress interacting with a row of SIA loops below its glide plane. The maximum speed at which a loop is dragged is lower in copper than iron, and the applied stress at which this occurs is also lower. These differences in the dynamics of cluster-dislocation interaction are determined by the atomic structure of the defects and cannot be investigated by continuum treatment.     

Linking Parents' Work Stress to Children's and Adolescents' Psychological Adjustment

Recent research indicates that parental work stress has implications for the quality of family interaction and, in turn, children's and adolescents' adjustment. Studies in two distinct genres are reviewed: investigations relying on global reports of work demands, family dynamics, and child and adolescent adjustment and studies focusing on within-person comparisons of family interaction on days characterized by high and low work stress. The effects of parental work stress on children's and adolescents' adjustment appear to be indirect. Work stress is linked to parents' feelings of overload and strain, which in turn predict lower parent-child acceptance and higher conflict, processes that in turn are related to less positive adjustment of children and adolescents. In the face of high work stress, withdrawing from family involvement may be adaptive in the short run but ultimately problematic. The strength of these associations depends on parents' personality qualities, parents' coping styles, and work and family circumstances.     

Neighborhood Context and Financial Strain as Predictors of Marital Interaction and Marital Quality in African American Couples

Demographic characteristics, family financial strain, neighborhood-level economic disadvantage, and state of residence were tested as predictors of observed warmth, hostility, and self-reported marital quality. Participants were 202 married African American couples who resided in a range of neighborhood contexts. Neighborhood-level economic disadvantage predicted lower warmth during marital interactions, as did residence in the rural south. Consistent with the family stress model (e.g., Conger & Elder, 1994), family financial strain predicted lower perceived marital quality. Unexpectedly, neighborhood-level economic disadvantage predicted higher marital quality. Social comparison processes and degree of exposure to racially based discrimination are considered as explanations for this unexpected result. The importance of context in relationship outcomes is highlighted.     

Acceptance and Commitment Therapy for Self-Stigma Around Sexual Orientation: A Multiple Baseline Evaluation

This study evaluated the effectiveness of 6 to 10 sessions of Acceptance and Commitment Therapy (ACT) for self-stigma around sexual orientation linked to same-sex attraction (what has generally been referred to as internalized homophobia; IH) in a concurrent multiple-baseline across-participants design. Three men and 2 women showed sizeable reductions from baseline to posttreatment and to 4- and 12-week follow-ups in daily reports of the degree to which thoughts about sexual orientation interfered in their lives; distress associated with these thoughts also decreased. Positive changes were observed in self-report measures of IH, depression, anxiety, stress, quality of life, and perceived social support. Consistent with the theory underlying ACT, reductions in daily ratings of the believability of thoughts about same-sex attraction (a process variable) were greater than those observed for frequency of such thoughts. Improvements were also observed in questionnaires measuring ACT processes. Mixed regression analyses confirmed outcome and process effects that were apparent through visual inspection. Implications and the distinctiveness of ACT as an approach are discussed.     

The impact of vacation and job stress on burnout and absenteeism

Abstract

The purpose of the present study was to test the hypothesis that vacation relief decreases psychological and behavioral strains caused by job stressors. We examined the impact of job stress and vacation on strain on 87 blue-collar employees in an industrial enterprise in central Israel. Whereas former respite research focused on the impact of vacation only on psychological strains such as burnout and job and life satisfaction, the current study also examined a behavioral strain, absenteeism. The employees completed questionnaires before and after vacation and again four weeks later. Our findings show that vacation alleviated perceived job stress and bumout as predicted, replicating findings that a respite from work diminishes levels of strain to lower than chronic, on-the-job levels. We found declines in burnout immediately after the vacation and a return to prevacation levels four weeks later, and a similar pattern with regard to absenteeism.     

A longitudinal person-centred approach to the job demands-control model

We used a longitudinal design and a person-centred methodology to test the strain and learning hypotheses of the job demands–control model among Finnish employees (n = 926), who were followed-up at three time points covering a period of 2 years (2008–2010). First, we identified longitudinal subgroups in demands and control across three measurement points. Second, we examined how these subgroups differed in strain (job exhaustion) and motivation-related outcomes (vigour at work, work–family enrichment). Growth mixture modelling revealed four subgroups: “stable high strain”, “stable low strain”, “increasing control”, and “decreasing control”. The stable high- and low-strain subgroups also differed in the outcomes studied (exhaustion, work–family enrichment) as suggested by the demands–control model. The findings also suggest that job control is subject to changes over time and that these changes are likely to be associated with changes in employee outcomes. Malleability of job control should be kept in mind in job stress interventions, likewise the fact that some employees suffer from chronic job stress.