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This study was conducted on children and adolescents from the three tribal cultures from Northern Tanzania: the Hadza, the Datoga and the Iraqw. The comparative data on aggression and conflict management skills were measured at Endomaga Boarding School, Lake Eyasi, Mangola in Northern Tanzania, in 2005‐2006. The final sample included 219 children, ranging from 7 to 20 years of age. No sex differences were found in self‐ratings or frequency of occurrence of physical, verbal and indirect aggression in Iraqw children and adolescents, or in self‐ratings in Hadza. Hadza boys reported a higher occurrence of physical and indirect aggression during the previous week compared to girls. No differences between the sexes were found in constructive conflict resolution and third‐party interventions practiced by Iraqw and Datoga children and self‐ratings in Hadza. Hadza boys reported a higher frequency of constructive conflict resolution and third‐party interventions compared to girls. Significant sexual dimorphism on the 2D:4D ratio was found for our African sample. A significant negative correlation between the right hand 2D:4D ratio and ratings on physical aggression was found for the girls. The girls with the lowest finger index estimated themselves as more verbally aggressive, compared to girls with a medium 2D:4D ratio.

This study investigates whether a higher level of pre‐natal testosterone, as indicated by the 2D: 4D digit ratio, is a correlate of psychopathy and cognitive empathy. The main research hypothesis predicts that 2D: 4D digit ratios will correlate negatively with psychopathy scores and positively with cognitive empathy scores. The study facilitates a within‐subjects correlational design, using a quasi‐experimental method consisting of questionnaires and digit measurements. Fifty‐four participants volunteered and were gathered via purposive and convenience sampling. Each participant completed a self‐report psychopathy scale, a cognitive empathy test, a verbal IQ test and a scan of both hands. The scans were later measured and computed for digit ratios. T‐tests, multiple partial correlations and multiple regression found that, contrary to the research hypothesis, a higher level of pre‐natal oestrogen, as indicated by a larger 2D: 4D digit ratio, is a positive correlate of psychopathy in females, and a positive correlate of callous affect (psychopathy sub‐scale) in males, at less than 0.01 probability levels. Gender is also a correlate of psychopathy, as males scored significantly higher than females at 0.01 probability levels. This result sheds an interesting new light on the physiological correlates of psychopathy and the role that pre‐natal oestrogen plays in organisational effects on the brain during pre‐ and post‐natal development.

This paper aims to investigate the role of nature and nurture in students’ entrepreneurial intention (EIs). In doing so, the study examines the relationship between prenatal testosterone exposure (2D:4D), risk-taking propensity, entrepreneurial self-efficacy and EIs. Moreover, the moderating role of entrepreneurial education between entrepreneurial self-efficacy and EI is also investigated.

In line with previous studies on EI, the authors tested hypotheses based on quantitative data obtained from university students.

Data were analyzed with the help of the structural equation modeling technique, and the results revealed that all the hypothesized relationships were supported.

The field of entrepreneurship has become an attractive area of research for practitioners and academics. One tinted area of research in entrepreneurship is the investigation of EI because it is a good predictor of entrepreneurial behavior. Several antecedents of EIs have been recognized in the literature ranging from personality traits to environmental factors. However, less is known about the role of biology in entrepreneurship. Incorporating biological factors in the field of entrepreneurship appears to be theoretically viable and sound. Thus, this study investigates the effect of biological factors in the presence of psychological factors on EIs, which is a unique contribution to the literature on entrepreneurship.

The study aims to investigate the relationship between chief executive officers' (CEOs') prenatal testosterone exposure, absorptive capacity and e-commerce adoption by small and medium-sized enterprises (SMEs).

Based on a study of 1,519 SMEs led by a male CEO in China, the impact of entrepreneur's digital ratio on e-commerce adoption is empirically analyzed through a multivariate logistic model.

The results show that the second-to-fourth digit ratio (2D:4D), a reverse measurement of prenatal testosterone exposure, is negatively correlated with the adoption of e-commerce by SMEs. This evidence suggests that CEOs with high prenatal testosterone exposure have a higher probability of adopting e-commerce. In addition, this research indicates a positive correlation between absorptive capacity, which is defined by market innovation, process innovation and marketing innovation, and the adoption of e-commerce by SMEs.

This research can contribute to the discussion by providing new insights into the antecedents of the adoption of e-commerce in SMEs.

In recent years, Yoga practice has seen a rapid rise in popularity with many positive consequences, both physical and mental attributed to its practice. Ashtanga Yoga has been less well researched in this area and is the specific focus on this work. The aim of this study is to investigate the possible positive impact of long-term Ashtanga Yoga on psychological well-being.

In total, 213 long-term Ashtanga Yoga practitioners were asked to complete the positive emotion, engagement, relationships, meaning, accomplishment (PERMA) 23 scale (Butler and Kern, 2016) which measures psychological well-being. The values given by these individuals were then compared against a larger sample of 31,966 representative of the general population.

Scores were then compared with a PERMA data set representative of the general population (see Butler and Kern, 2016), primarily using a test of difference to compare samples. Secondly, the causal relationship between time spent in practice upon well-being scores.

Findings indicated that those individuals engaged in long-term Ashtanga Yoga practice significantly outperformed the control group on all dimensions of psychological well-being.

This work has demonstrated specific benefits to the practice of Ashtanga Yoga on psychological well-being. Yoga is a form of exercise that is now widely available across the globe, and as such, represents an accessible form of physical practice, which has important psychological benefits.

To the authors’ knowledge, this is the first work investigating differences in psychological well-being profiles using PERMA, as a function of Yoga practice.

In this chapter, I consider how and why gender continues to impact motivation, task engagement, self-regulation, and educational aspirations, choices, and outcomes among both boys and girls. How can motivation theory and research contribute to understanding gender differences in achievement at school, where girls now tend to do better than boys, especially in less advantaged social groups, and at work, where women still tend to achieve and earn less than similarly qualified men? In the first section of this chapter, I review evidence of gender-related motivational orientations whereby boys tend more to “prove and protect” and girls tend more to “doubt and try to improve” their abilities. I analyze the benefits and costs of these orientations, focusing on how they contribute to the superior school performance of girls, to spurring high-achieving boys to succeed more in later life than similarly able girls, and to placing lower-achieving boys, who often belong to minority groups, at particular risk for academic disengagement. I then consider how boys and girls construct and maintain motivating and motivated beliefs and strategies in interactions with parents, teachers, and peers within the social and educational contexts of their daily lives. In the final section, I first present some educational recommendations that follow from my analysis. I then engage directly with the overarching theme of this volume by considering some broad societal trends that present continuing challenges to educators concerned to promote optimal motivation for learning among both boys and girls in the twenty-first century.

Teenagers are typically described as impulsive and risk taking. Yet recent research shows that this observation does not hold in all contexts. Rather, adolescents show higher impulsivity and risk taking than children or adults in affective contexts. Motivational and affective processes are therefore of particular interest when trying to understand typical adolescent behavior. Additionally, pubertal hormones are hypothesized to play a special role in adolescents’ motivated decision making. However, evidence for the mechanisms underlying this relationship is sparse. In this chapter, we aim to integrate findings from human and animal studies in order to elucidate the specific impact of pubertal hormones on motivational processes in adolescence. Against this background, we critically discuss and reinterpret recent findings in psychology and neuroscience, speculate about underlying mechanisms, and suggest new approaches for future studies of adolescent behavior.

Airscrews GENERAL 624. Emission of sound by airscrews. (With diagrams.) March 1919. (4d.).

The rapid development of the construction industry requires effective ways to monitor and control the project, and the use of 4D BIM is found to be very efficient. The purpose of this paper is to consider development, application and evaluation of 4D Bridge Information Modelling (BrIM) models for an ongoing bridge project.

An ethnographic action-based case study research methodology is adopted in this study. An ongoing bridge construction project in India is chosen and the 4D BrIM application is evaluated both quantitatively and qualitatively using planned percentage complete (PPC) measurements and semi-structured interviews, respectively.

The evaluation of the case study shows an increase in PPC values from 26.5 to 56.4 per cent after implementation of 4D BrIM in the project. The application of 4D BrIM in the construction phase benefits the project team in material delivery planning, project monitoring and control, construction schedule improvement, documentation and coordination.

The developed models are practically applied to the ongoing project and the positive benefits are observed. It is shown that 4D BrIM has the potential to improve the construction of bridge projects.

Studies have contributed towards the development and implementation of 3D BrIM models for bridge projects. Limited efforts have been taken to analyse how 4D BrIM models help in the overall management of bridge projects. This study adds value to the existing literature through development, implementation and systematic qualitative and quantitative evaluation of 4D BrIM models.