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This study examines the hypothesis that temperamental (dis)similarity is associated with twin relationship quality. In a longitudinal study that followed 322 monozygotic twins (who share close to 100% of their genes) and 1199 dizygotic twins (who on average, share 50% of their segregating genes) throughout childhood, mothers (N = 1547) and fathers (N = 536) reported on their twins' relationships on at least one of four measurement points when the twins were between 3 and 8–9 years of age. Mothers also reported on the twins' temperament. Negative associations were found between reports by both parents on the twins' closeness and their temperament difference throughout childhood, while positive associations were found between twins' conflict and their temperament difference in late childhood. Latent growth modeling indicated that the association between temperament differences and the twins' mother-reported closeness was evident beyond the effect of zygosity. A different pattern was found for twin conflict: the more the twins differed in their temperament (specifically negative emotionality) with age, the more the conflict between them increased. Our findings support the hypothesis that personality similarities can contribute to positive relationships from early childhood, and vice versa, beyond the effect of genetic similarity. [ABSTRACT FROM AUTHOR]

Background Variations in the fat mass and obesity-associated gene (FTO) are associated with obesity; however, it is unclear if changes in energy intake affect the adaptive response to caloric restriction in those with risk variants. The three FTO single nucleotide polymorphisms (SNPs), rs1421085, rs17817449 and rs9939609, are in strong linkage disequilibrium. Thus, the purpose of this investigation was to determine the role of these FTO SNPs vis-à-vis the effects of a 4-week hypocaloric diet on body composition in exercise-trained men and women. Two salivary biomarkers that associate with energy expenditure were also assessed (cortisol and salivary alpha-amylase, sAA). Methods Forty-seven exercise-trained men (n = 11) and women (n = 36) (mean ± SD: age 32 ± 9 years; height 169 ± 8 cm, body mass index 24.5 ± 2.9 kg/m2, hours of aerobic training per week 4.9 ± 3.8, hours of weight training per week 3.9 ± 2.4, years of training experience 13.4 ± 7.0) completed a 4-week hypocaloric diet (i.e., decrease total calories by ~ 20–25% while maintaining a protein intake of ~ 2.0 g/kg/d). Subjects were instructed to maintain the same training regimen and to decrease energy intake via carbohydrate and/or fat restriction during the treatment period. Body composition was assessed via dual-energy X-ray absorptiometry (DXA) (Model: Hologic Horizon W; Hologic Inc., Danbury CT USA). Total body water was determined via a multifrequency bioelectrical impedance (BIA) device (InBody 770). Saliva samples were collected pre and post intervention in order to genotype the participants as well as to determine the concentrations of cortisol and sAA. Results Of the 47 subjects, 15 were of normal risk for obesity whereas 32 were carriers of the FTO gene risk alleles. Subjects were grouped based on their genotype for the three FTO SNPs (i.e., rs1421085, rs17817449 and rs9939609) due to their strong linkage disequilibrium. We have classified those with the normal obesity risk as “non-risk allele” versus those that carry the “risk allele” (i.e., both heterozygous and homozygous). Both groups experienced a significant decrease in total energy intake (p

Delayed gratification is the ability to postpone an immediate gain in favor of greater and later reward. Although delayed gratification has been studied extensively, little is known about the motivation behind children’s decisions. Since values are cognitive representations of individuals’ motivations, which serve to guide behavior, we studied the relationship between children’s values and delayed gratification. Two main distinct motivations overlapping with values may underlie this decision: conservation - the desire to reduce uncertainty and preserve the status quo, and self-enhancement – the desire to maximize resources and profit for the self. Accordingly, we hypothesized that conservation values would relate to children’s preference to hold on to what is given as soon as possible, and that self-enhancement values would relate to children’s preference for delaying gratification. Seven-year old children (N = 205) ranked their values with the Picture-Based Values Survey (Döring et al., 2010) as part of the Longitudinal Israeli Study of Twins (LIST) (Avinun and Knafo, 2013). The children also played a decision-making animation game that included delayed gratification decisions. In support of our hypotheses, greater delayed gratification related negatively to conservation values, specifically to security and tradition, and related positively to self-enhancement values, especially power and achievement. This is one of the first demonstrations that children’s values relate meaningfully to their behaviors.

Background: Quality early childhood programmes have proven to be highly cost-effective in reversing the detrimental consequences of poverty on children’s development. However, these programmes can only influence developmental outcomes of poor children if their needs are considered. Aim: The purpose of this article was to inquire into the experiences of two early childhood development (ECD) practitioners working and living in impoverished and marginalised predominantly white communities where the involvement of volunteers from charity organisations was prominent. The researchers argued that the practitioners’ experiences regarding their work should inform the kind of complementary volunteer aid and support sought for. Setting: The research sites were two informal predominantly white settlements where unemployed residents lived in makeshift housing. Methods: A narrative inquiry, nested in the social constructivist paradigm, was employed to explore the experiences of two practitioners. Data were collected from narrative interviews, observations, documents, photographs and artefacts. Results: Both participants knew well that the needs of the children in their care differed significantly from those of their more affluent peers and believed that training would equip them better for their task. Although both centres (and communities) benefitted from volunteer support, this well-intended aid was often misguided as the volunteers were not qualified educators and did not understand the context. Conclusion: The volunteers did not empower the practitioners to use their insight and experience to deliver a quality programme fit for context. Instead, they left the practitioners with a sense of disempowerment by dictating the programmes and practices to be followed in the respective ECD centres, even though they were not qualified to do so.

Empathy is relevant to many psychiatric conditions. Empathy involves the natural ability to perceive and be sensitive to the emotional states of others. Thus, emotion recognition (ER) abilities are key to understanding empathy. Despite the importance of ER to normal and abnormal social interactions, little is known about how it develops throughout childhood. We examined genetic and environmental influences on children’s ER via facial and vocal cues in 344 7-year-old twin children [59 monozygotic (MZ) and 113 same-sex dizygotic (DZ) pairs], who were part of the Longitudinal Israeli Study of Twins. ER was assessed with the child version of the Diagnostic Assessment of Nonverbal Accuracy. For both facial and vocal cues of emotion, twin correlations were not higher for MZ twins than for DZ twins, suggesting no heritability for ER in this population. In contrast, correlations were positive for both types of twins, indicating a shared environmental effect. This was supported by a bivariate genetic analysis. This pattern was robust to controlling for twins being of the same sex and age. Effects remained after controlling for background variables such as family income and number of additional siblings. The analysis found a shared environmental correlation between facial and vocal ER (rc = .63), indicating that the shared environmental factors contributed to the overlap between vocal and facial ER. The study highlights the importance of the shared environment to children’s ER.

As they inhabit complex social worlds, adolescents often learn competing values, resulting in value-differentiation, within-individual variability in value importance across contexts. But what are the implications of value-differentiation across age groups and cultures? A study of 4007 adolescents aged 11 to 18 (M = 14.41, SD = 2.16), of three Israeli groups (majority, former Soviet Union immigrants, Arabs) discovered negative relations between value-differentiation and self-esteem, suggesting that confusion may result from value incoherence. The relations were stronger among younger adolescents than older ones and were especially strong among younger first-generation immigrant adolescents, pointing to the need to address the value-differentiation of immigrant adolescents.

Prosocial behavior is versatile, multifaceted, and complex. This special section seeks to advance coherent, integrative understanding of prosocial development by addressing this topic through the prism of motivations. This conceptual Introduction presents key ideas that provide a framework for thinking about motivation for prosocial behavior and its development. It outlines the evolutionary roots of prosocial behavior, underscoring the interdependent roles of nature and nurture. This is followed by a discussion of several key psychological mechanisms reflecting different motivations for prosocial action (empathy for a distressed other, concern about another's goal, desire to act in accordance with internalized prosocial norms, and guilt). We discuss the critical components of each motivation and highlight pertinent contributions of the special section articles.