Trading transforms of non-weighted simple games and integer weights of weighted simple games

Theory and Decision - This study investigates simple games. A fundamental research question in this field is to determine necessary and sufficient conditions for a simple game to be a weighted...     

How to Detect Altruists: Experiments Using a Zero-Acquaintance Video Presentation Paradigm

Journal of Nonverbal Behavior - In this study, we investigated the cognitive processes and nonverbal cues used to detect altruism in three experiments based on a zero-acquaintance video...     

Parents' Goals for Children: The Dynamic Coexistence of Individualism and Collectivism in Cultures and Individuals

Current scholarship on the cultural value systems of individualism and collectivism, and the associated developmental goals of autonomy and relatedness, has moved beyond grand divide theories to emphasize variation within individuals and cultures. We present a theoretical model on the dynamic coexistence of cultural value systems (at the macro level) and parents' developmental goals (at the micro level). We contend that cultural values and developmental goals that have largely been classified as polar opposites may be viewed as conflicting, additive, or functionally dependent. Parents may view the developmental goal of autonomy as interfering with the goal of relatedness (and vice versa); parents may endorse both autonomy and relatedness; and parents may consider the developmental goal of relatedness to be a path to the goal of autonomy and/or autonomy to be a path to relatedness. These forms of coexistence are themselves dynamic, changing across situations, developmental time, and in response to social, political, and economic contexts.     

Negative Stereotypes of Ethnic Outgroups: A Longitudinal Examination Among Palestinian,Israeli Jewish,and Israeli Arab Youth

Ethno‐political conflict impacts thousands of youth globally and has been associated with a number of negative psychological outcomes. Extant literature has mostly addressed the adverse emotional and behavioral outcomes of exposure while failing to examine change over time in social cognitive factors in contexts of ethno‐political conflict. Using cohort sequential longitudinal data, this study examines ethnic variation in the development of negative stereotypes about ethnic outgroups among Palestinian (n = 600), Israeli Jewish (n = 451), and Israeli Arab (n = 450) youth over 3 years. Age and exposure to ethno‐political violence were included as covariates for these trajectories. Findings indicate important ethnic differences in trajectories of negative stereotypes about ethnic outgroups, as well as variation in how such trajectories are shaped by prolonged ethno‐political conflict.     

Benzene Risk Estimation Using Radiation Equivalent Coefficients

We estimated benzene risk using a novel framework of risk assessment that employed the measurement of radiation dose equivalents to benzene metabolites and a PBPK model. The highest risks for 1 μg/m³ and 3.2 mg/m³ life time exposure of benzene estimated with a linear regression were 5.4 × 10⁻⁷ and 1.3 × 10⁻³, respectively. Even though these estimates were based on in vitro chromosome aberration test data, they were about one-sixth to one-fourteenth that from other studies and represent a fairly good estimate by using radiation equivalent coefficient as an "internal standard."     

Contrasting effects of urbanization on arboreal and ground-dwelling land snails: role of trophic interactions and habitat fragmentation

Urbanization generally reduces wildlife populations. Individual species responses, however, are often highly variable, and such variability can be explained by differences in species ecological traits. To examine this hypothesis, we focused on two co-occurring land snails, Ezohelix gainesi and Euhadra brandtii sapporo; the former is ground-dwelling and the latter is arboreal. We first estimated their population densities at nine sites distributed along an urbanization gradient: three were located in continuous natural forests, three at the edge of natural forests, and the rest in small isolated forests in urban areas. As a result, the ground-dwelling E. gainesi occurred at highest density in urban forests, followed by forest edges and continuous forests. By contrast, the arboreal E. b. sapporo occurred at highest density in continuous forests, but declined in forest edges and urban forests. We then conducted manipulative field experiments to quantify changes in predation pressure on these species. Ground-tethered E. gainesi and E. b. sapporo were repeatedly predated upon by forest-living mammals in continuous forests, but their survival rates increased in forest edges and urban forests. By contrast, canopy-tethered E. b. sapporo maintained high survival rates in all three forest types. The results indicate that a lack of mammalian predators enables ground-dwelling species to occur at high densities in urban forests, whereas the arboreal species was not affected by this predator relaxation effect. The combination of species-specific behavioural traits and changes in predator communities across an urbanization gradient has important effects on the biodiversity of urban ecosystems.

     

Financial literacy and anxiety about life in old age: evidence from the USA

This study examines whether financial literacy can help to reduce anxiety about life in old age. We hypothesized that financially literate people are more able to earn income and accumulate assets, leading them to have a less anxious life in old age. On the other hand, less financially literate people rely more on social security to secure themselves in the old age as they are not able to accumulate sufficient assets. By using US survey data, we provide evidence that assets significantly reduce anxiety about life in old age only for people who are more financially literate. For less financially literate people, social security plays an important role in reducing anxiety about life in old age. Besides these, having a child and doing regular exercise also reduced anxiety for all respondents but marital status reduced anxiety in respondents over 40 years of age. The results of our study are robust to measurement of financial literacy and endogeneity problems.     

Correction to: contrasting effects of urbanization on arboreal and ground-dwelling land snails: role of trophic interactions and habitat fragmentation

Urban Ecosystems - The original version of the article unfortunately contained mistakes in the legends of Fig. 3. The legends (1) Blue square: Euhadra brandtii sapporo, ground is changed...     

Cultural self-construction and identity formation in emerging adulthood: a study on Japanese university students and workers

Cultural pathways of identity formation have been largely unexplored. In many Asian cultures, youth are expected to concentrate on adaptation to their groups or relationships rather than pursuing their own uniqueness. Then, how do they develop a sense of identity while considering groups or relationships to be important? The purposes of this study were (a) to examine relationships between cultural self-construction (i.e. independence and interdependence) and identity processes (i.e. commitment, in-depth exploration, and reconsideration of commitment) in both societal and relational domains, and (b) to analyze the relationships of self-construction and identity processes with well-being, using a sample of Japanese emerging adults (i.e. university students and workers) aged 18–25 years. The findings indicated that relational identity was related to both independence and interdependence, whereas societal identity was mainly related to independence. Moreover, independence and identity in both societal and relational domains was positively related to well-being. Furthermore, the patterns of relationships among self-construction, identity, and well-being were found to be similar between university students and workers. These findings imply that while Japanese emerging adults have developmental needs to express one's own uniqueness, they are also directed to form a sense of identity emphasizing the maintenance of harmonious relationships with others.     

Longitudinal assessment of social attention in preterm and term infants: Its relation to social communication and language outcome

Preterm birth has been reported to be associated with an increased risk of social communication and language problems. Recently, we found that preterm infants showed atypical patterns of social attention compared with term infants. However, it is still unknown how social attention develops and whether the individual differences are associated with developmental outcomes for social communication and language in preterm infants. The social attention of preterm and term infants at 6, 12, and 18 months was investigated using two types of social attention tasks (human-geometric preference task and gaze-following task). The Modified Checklist for Autism in Toddlers (M-CHAT) and the MacArthur Communicative Development Inventory adapted for Japanese were measured at 18 months. We found that compared with term infants, preterm infants spent less time looking toward dynamic human images and followed another's gaze directions less frequently through 6, 12, and 18 months. Moreover, hierarchical multiple regression analysis revealed that less preference for dynamic human images and gaze-following abilities was associated with high M-CHAT and low language scores in preterm and term infants, respectively. These findings suggest that birth status affects development of social attention through 18 months and individual differences in social attention reflect differences in social communication and language outcomes.