Evaluation of and support for group prototypical leaders: a meta-analysis of twenty years of empirical research

The key premise of the social identity theory of leadership, that group prototypical leaders are more favorably evaluated than less prototypical leaders, is supported by twenty years of research. To establish overall how much variance in leader evaluation is attributable to leader prototypicality we conducted a meta-analysis of 35 independent studies (N = 6678). Prototypicality accounted for 24% of variance in leader evaluation. There was a large overall effect (r = .49), which was moderated by research method and type of evaluation. The relationship was stronger in correlational studies (r = .60) than experiments (r = .35), and on measures of leader trust (r = .63) than effectiveness (r = .43). Theoretical implications and future directions are discussed.     

Effects of 12 weeks of Nordic Walking and XCO Walking training on the endurance capacity of older adults

Background

Several studies have already examined the positive effects of various forms of endurance training in patient groups and in healthy adults up to 60 years old. The aim of this study was to analyse the effects of Nordic Walking (NW) and XCO Walking (XCO) training on endurance capacity in healthy older adults, aged 60 years and older.

Methods

Twenty-three older participants (mean age: 69.9 ± 5.4 years) were randomly assigned to either the NW group or the XCO group. All participants were measured before and after the 12 weeks of endurance training (2 sessions/week) to examine oxygen uptake (VO₂) and energy consumption during an outdoor field test. In addition, heart rates were recorded and lactate samples were collected.

Results

NW mainly demonstrated some significant (p < 0.05) decreases in heart rate, lactate concentration at lower to moderate walking speeds, whereas XCO Walking revealed significant (p < 0.05) decreases in lactate concentration and VO₂ at low to higher walking speeds.

Conclusions

NW as well as XCO training increase the efficiency of the cardio-vascular system in older subjects. Both training approaches are suitable options for endurance training, which may serve to counteract age- and inactivity-related decreases in cardio-vascular functioning as well as aid in maintaining overall performance in older adults.

     

The Wage Gap between Foreign and Spanish Nationals in Spain: an Analysis Using Matched Employer–Employee Data

In this paper, we analyse wage differences between foreign and Spanish nationals in Spain. This analysis is relevant because Spain has witnessed a sharp increase in the proportion of foreign workers over the past decade. In our analysis, we explicitly account for unobserved heterogeneity at firm level, a situation which occurs when relevant covariates (for example, those connected to a specific firm's production process) are not included in the model because they are unmeasurable, unobservable or unavailable for the researcher. When accounting for such heterogeneity, our results show that wage gaps between foreign nationals from developing countries and Spanish nationals range between ?6.35 per cent and ?11.30 per cent. We also find that wage differences, between Spanish nationals and others in the same firm and job, are substantially greater for almost every group of low‐tenured foreign workers and also for those holding open‐ended contracts.     

Are infants' preferences in the number change detection paradigm driven by sequence patterns?

Inter-individual differences in infants' numerosity processing have been assessed using a change detection paradigm, where participants were presented with two concurrent streams of images, one alternating between two numerosities and the other showing one constant numerosity. While most infants look longer at the changing stream in this paradigm, the reasons underlying these preferences have remained unclear. We suggest that, besides being attracted by numerosity changes, infants perhaps also respond to the alternating pattern of the changing stream. We conducted two experiments (N = 32) with 6-month-old infants to assess this hypothesis. In the first experiment, infants responded to changes in numerosity even when the changing stream showed numerosities in an unpredictable random order. In the second experiment, infants did not display any preference when an alternating stream was pitted against a random stream. These findings do not provide evidence that the alternating pattern of the changing stream contributes to drive infants' preferences. Instead, around the age of 6 months, infants' responses in the numerosity change detection paradigm appear to be mainly driven by changes in numerosity, with different levels of preference reflecting inter-individual difference in the acuity of numerosity perception.     

Determinants of Unemployment Duration for Displaced Workers

ABSTRACT: In this paper we use survival analysis to estimate a reduced form model of the determinants of unemployment and unemployment registration durations. The variables considered in the analysis include personal characteristics, local demand conditions, unemployment income, and the time spent unemployed. The data set was collected both through personal interviews and Employment Service files and includes information on the individual history of a sample of displaced workers who were laid off during 1983 because of plant closings and job cuts in some industrial districts of the metropolitan area of Milan. The parametric models included in the analysis are based on the Weibull, Log-logistic and Log-normal distributions. The results do not show the existence of negative time dependence.     

Die intra-individuelle Stabilität gesellschaftlicher Wertorientierungen

In empirical social research very little is known about the internal stability of social value orientations. The main reason for this is a shortage of long-time panel studies including usable value indicators. Beyond this background we analyse the German Socio-Economic Panel (SOEP) which enables us to examine the internal stability of Inglehart’s postmaterialism across a time span of at least twelve years. By using multi-level-models for panel data we can demonstrate the existence of cohort effects as well as life cycle effects among the two youngest birth cohorts and among respondents with higher education.     

Assessing physical, sexual, and psychological violence perpetrated by intimate male partners toward women: a Spanish cross-sectional study

There have been many studies on the impact of intimate partner violence (IPV) on women's health, there being agreement on its detrimental effect. Research has focused mainly on the impact of physical violence on health, with few studies assessing the effect of sexual and psychological violence. Furthermore, there are many differences in the way violence experienced by women is assessed. While some researchers use available instruments, others develop their own questionnaires. This article gives detailed information about physical, sexual, and psychological violence, lifetime history of women's victimization, and aspects of women's behavior and feelings obtained with the questionnaire used in a Spanish cross-sectional study. Our results corroborate that IPV is not homogeneous, it being necessary to ask women about each type of violence they have experienced. Furthermore, to accurately assess the impact of IPV on women's health, it is necessary to control for other variables that also have detrimental effects on health.