Why Do Some Toddlers Help A Stranger? Origins of Individual Differences in Prosocial Behavior

This study investigated the influence of emotion on toddlers' prosocial behavior in instrumental helping tasks with an unfamiliar adult. The goals were to examine whether early prosocial behavior was affected by (1) the adult's expressions of sadness (in contrast to a neutral expression) as a cue of need and (2) toddlers' emotion understanding. Thirty‐five 18‐ to 20‐month‐olds participated in eight trials in which an experimenter either indicated need for assistance (experimental condition) or did not (control). In addition, the experimenter expressed either sadness or neutral affect in each trial. Toddlers' emotion understanding was assessed using maternal reports of children's emotion words. The experimenter's emotional expression alone was not associated with prosocial behavior, but toddlers helped more in experimental than control conditions. However, toddlers with larger emotion word vocabularies were marginally more prosocial when the experimenter expressed sadness, and girls provided more assistance than boys in experimental conditions. These findings highlight the complex influences of emotion on early prosocial motivation.     

Effects of sexually transmitted infection status, relationship status, and disclosure status on sexual self-concept

Research has indicated that having a sexually transmitted infection (STI) such as genital herpes and genital human papilloma virus (HPV) can have a negative impact on an individual's sexuality. The current study was designed to evaluate the effect of STI status, relationship status, and disclosure status on various dimensions of sexual self-concept. A questionnaire that evaluated the above variables was completed by 117 individuals with genital herpes, 82 individuals with HPV, and 75 individuals with no STI. The results demonstrated that having herpes or HPV had a significant negative impact on aspects of sexual self-concept. It does not appear that an individual's relationship status is a factor associated with the impact of having an STI on the sexual self-concept. Respondents who had disclosed their STI to their partners, however, had significantly more positive feelings about aspects of their sexual self-concept than those who had not disclosed their STI to their partners. The implications of these research findings for health practitioners are discussed.     

Predictors of well-being among college students

ABSTRACT

Objectives: Identification of health-related risk behaviors associated with well-being in college students is essential to guide the development of health promotion strategies for this population. The purposes were to evaluate well-being among undergraduate students and to identify health-related risk behaviors that predict well-being in this population. Methods: A cross-sectional Web-based survey of undergraduate students was conducted at a metropolitan university in the Southeast United States. A total of 568 students responded (response rate 14.2%). Data were collected on health-related risk behaviors using the National College Health Assessment II. Results: Controlling demographic characteristics, the best predictive model included physical activity, current tobacco user, depression, ever received mental health services, and sleep quality, which was the strongest predictor (β = .45, p < .001). This model explained 35% of the variance in well-being. Conclusions: Interventions that promote sleep quality among college students may be most beneficial in improving well-being.     

Quality and Peer Review of Research: An Adjudicating Role for Editors

Peer review gives research a stamp of approval, but the reviews themselves can be flawed. This is potentially serious for the writer, the journal, and journal user. This study describes shortcomings of the peer review process and condenses them into an explanatory framework involving situational, personal, social, and ethical factors. Some proposals to improve matters are impractical and may make them worse. Some data is offered which illustrates the problem and suggests a potential solution. Informed editors who avoid mechanical approaches engage cautiously and critically with reviews and guard against bias, even in themselves, could make a significant difference.     

Factors That Influence Willingness to Help the Homeless

Homelessness is an ongoing challenge for many families and individuals. Many struggle to meet their basic needs for food, clothing and shelter. Unfortunately, we know very little about the people who directly help homeless people meet these needs. The present study examines the relationships between empathy, religion, household income, political orientation, gender, race, and people's expressed willingness to assist the homeless. Results demonstrate a strong and consistent link between empathy and willingness to help. Moderately consistent associations are found for religion and race. Limitations, suggestions for further research, and for practical application are discussed.     

GAMMA-BASED CLUSTERING VIA ORDERED MEANS WITH APPLICATION TO GENE-EXPRESSION ANALYSIS

Discrete mixture models provide a well-known basis for effective clustering algorithms, although technical challenges have limited their scope. In the context of gene-expression data analysis, a model is presented that mixes over a finite catalog of structures, each one representing equality and inequality constraints among latent expected values. Computations depend on the probability that independent gamma-distributed variables attain each of their possible orderings. Each ordering event is equivalent to an event in independent negative-binomial random variables, and this finding guides a dynamic-programming calculation. The structuring of mixture-model components according to constraints among latent means leads to strict concavity of the mixture log likelihood. In addition to its beneficial numerical properties, the clustering method shows promising results in an empirical study.