What's in it for Me? Motivational Differences between Farmers' Subsidised and Non‐Subsidised Conservation Practices

Through nature conservation practices, farmers can strongly enhance nature quality and biodiversity in rural areas. In this paper, the social psychological underpinnings of farmers' nature conservation practices are investigated using the Theory of Planned Behavior, to which the concepts of self‐identity and personal norms were added. A distinction is made between nature conservation practices done on a non‐subsidised basis and nature conservation practices for which farmers receive some form of remuneration from the Dutch government. Eighty‐five arable farmers participated in our survey. Results show that our model explains more variance in the intention to perform non‐subsidised than subsidised nature conservation practices. Also, the concepts of self‐identity and personal norms appear to be related to the intention to perform non‐subsidised, not subsidised conservation.     

A European in Asia†

How culture‐proof are the social sciences? Travelling in another continent, one meets culture's influences not only in the objects of social science research, but at least as much in the minds of the researchers. Researchers' problem definitions and choices of issues to be addressed and questions to be asked limit what they will find; they are a potential source of ethnocentric bias. A case example of the discovery of such a bias was the emergence of a fifth dimension of national cultures supplementing Hofstede's four, through Bond's Chinese Value Survey. In the area of personality research, a number of newer and older findings by Asian and European researchers suggest the need for expanding the ‘Big Five’ model of personality traits with a sixth factor, Dependence on Others, in order to make the model culturally universal. In general, researchers recognize primarily those aspects of culture for which their own culture differs most from others. For escaping from the cultural constraints in our own research we therefore need to trade ideas with colleagues from other parts of the world. In this respect, Asian researchers have an important role to play.     

Studies on wild house mice VI: Differential effects of the Y chromosome on intermale aggression

The aim of this study is to determine the effects of different parts of the Y chromosome of wild house mice on aggression. To reach this goal, intercrosses were made between two selection lines for attack latency (SAL and LAL) and their congenic strains (SAL. LY and LAL. SY). This procedure resulted in F₁ hybrids that carried the same autosomes, but differed in their X chromosome and the two different parts of their Y chromosomes, the different parts of the Y chromosome being a recombining part called the pseudoautosomal region (PAR) and a non-recombining part (non-PAR). We conclude that both parts of the Y chromosome contribute slightly but significantly to variation in aggression. The major effect is accomplished by the PAR of the aggressive parent; a mirror effect is achieved by the non-PAR of the aggressive parent in interaction with the PAR. © 1994 Wiley-Liss, Inc.     

Studies on wild house mice iv: On the heredity of testosterone and readiness to attack

An attempt was made to determine the role of the Y chromosome in the development of aggression in wild house mice. The aggression-eliciting property of testosterone depends not only on circulating adult testosterone, but also on perinatal sensitization of the central nervous system to this steroid. Results of crosses between aggressive (SAL) and non-aggressive (LAL) mice indicate that adult plasma testosterone in these mice is determined by the autosomes, high testosterone levels being dominant over low levels. Conversely, the Y-chromosomal effect seems related to perinatal processes that sensitize the brain for testosterone.     

Treatment Effect on Recidivism for Juveniles Who Have Sexually Offended: a Multilevel Meta-Analysis

The current study investigated the effect on recidivism of treatment aimed at juveniles who have sexually offended. It also assessed the potential moderating effect of type of recidivism, and several treatment, participant and study characteristics. In total, 14 published and unpublished primary studies, making use of a comparison group and reporting on official recidivism rates, were included in a multilevel meta-analysis. This resulted in the use of 77 effect sizes, and 1726 participants. A three-level meta-analytic model was used to calculate the combined effect sizes (Cohens d) and to perform moderator analyses. Study quality was assessed with the EPHPP Quality Assessment Tool for Quantitative Studies. A moderate effect size was found (d = 0.37), indicating that the treatment groups achieved an estimated relative reduction in recidivism of 20.5% as compared to comparison groups. However, after controlling for publication bias, a significant treatment effect was no longer found. Type of recidivism did not moderate the effect of treatment, indicating that treatment groups were equally effective for all types of recidivism. Also, no moderating effects of participant or treatment characteristics were found. Regarding study characteristics, a shorter follow up time showed a trend for larger effect sizes, and the effect size calculation based on proportions yielded larger effect sizes than calculation via mean frequency of offending. Implications for future research and clinical practice are discussed.     

Current issues and new directions in Psychology and Health: The costs and benefits of self-regulation – a call for experimental research

Abstract

This study was designed to assess the effects of exercise on psychological functioning in healthy Type A men. Seventy-three middle-aged men (M=42.2 years) were randomly assigned either to an aerobic exercise (AE) training group or to a strength and flexibility (SF) training group. Subjects completed a comprehensive psychological assessment battery prior to beginning the 12-week exercise programs, and after completing the programs. The psychological test battery included measures of depression, anxiety and stress, as well as various psychiatric symptoms. In addition, subjects underwent graded exercise treadmill tests (ETT) at both times of measurement in order to document changes in cardiorespiratory fitness. Aerobic exercise training consisted of walking, jogging or stair-climbing at an intensity of at least 70% of initial measured maximal oxygen consumption (VO₂max determined during the treadmill test). Strength and flexibility training consisted of circuit Nautilus training with no aerobic exercise. Results at the conclusion of the 12-week programs indicated that [Vdot]O₂max for the AE group increased by 15%, while the SF group did not change. Both groups improved on measures of psychological well-being; however, there were no differential effects of the two exercise programs on measures of psychological functioning. These results suggest that improved cardiovascular fitness is not necessary for psychological improvement among exercise participants.     

Factors associated with traumatic symptoms and internalizing problems among adolescents who experienced a traumatic event

Abstract

The aim of the present study was to identify factors that are related to the traumatic symptoms and problem behavior among adolescents who experienced the New Years fire in 2001 in Volendam, The Netherlands. Three groups of factors were considered: pre-trauma (personality and coping), trauma-related (physical and emotional proximity to disaster), and post-trauma factors (received social support). Forty-five adolescents completed the questionnaire. Two years after the disaster, these adolescents experienced significant traumatic stress reaction (70% within the clinical range) and showed clinically significant levels of internalizing problems (37%). Pre-trauma, individual factors were identified as the most important predictors of distress, followed by received social support. The indicators of physical and emotional proximity to disaster explained little variance in distress.     

Attention modulates sensory suppression during back movements

Tactile perception is often impaired during movement. The present study investigated whether such sensory suppression also occurs during back movements, and whether this would be modulated by attention. In two tactile detection experiments, participants simultaneously engaged in a movement task, in which they executed a back-bending movement, and a perceptual task, consisting of the detection of subtle tactile stimuli administered to their upper or lower back. The focus of participants’ attention was manipulated by raising the probability that one of the back locations would be stimulated. The results revealed that tactile detection was suppressed during the execution of the back movements. Furthermore, the results of Experiment 2 revealed that when the stimulus was always presented to the attended location, tactile suppression was substantially reduced, suggesting that sensory suppression can be modulated by top-down attentional processes. The potential of this paradigm for studying tactile information processing in clinical populations is discussed.     

Differential effects of a visual illusion on online visual guidance in a stable environment and online adjustments to perturbations

In the reported, experiment participants hit a ball to aim at the vertex of a Müller–Lyer configuration. This configuration either remained stable, changed its shaft length or the orientation of the tails during movement execution. A significant illusion bias was observed in all perturbation conditions, but not in the stationary condition. The illusion bias emerged for perturbations shortly after movement onset and for perturbations during execution, the latter of which allowed only a minimum of time for making adjustments (i.e., approx.170 ms). These findings indicate that allocentric information is exploited for online control when people make rapid adjustments in response to a sudden change in the environment and not when people guide their limb movements to interact with a stable environment.