Studying aggression in school children: The use of a wireless microphone and micro‐video camera

This paper describes a wireless microphone and micro‐video camera used successfully by the present authors to study direct, indirect, and relational forms of aggression in schools. Two major advantages of this equipment are identified; first, it avoids some of the potential biases and difficulties associated with the other methods and, second, it allows researchers to record and analyze a large number of significant variables that may otherwise be difficult to assess. The importance of this kind of data is discussed in relation to the development of effective interventions aimed at reducing aggression in schools. Aggr. Behav. 28:356–365, 2002. © 2002 Wiley‐Liss, Inc.     

Relational aggression in college students: Examining the roles of social anxiety and empathy

This study examined the unique contributions of social anxiety and empathy to relational aggression in 300 19–to–25–year–old (M=21.25; SD=1.32) male (n=97) and female (n=203) college students using hierarchical linear regression analysis. The interactive relations between gender and social anxiety, and between gender and empathy, were also assessed. In addition to the gender and overt aggression covariates, fear of negative evaluation and perspective taking were unique predictors of relational aggression. Males, students who were more overtly aggressive, and those who reported greater fear of negative evaluation were more relationally aggressive than were peers. Students with higher levels of perspective taking reported using less relational aggression than did peers. A gender x empathetic concern interaction indicated that for males only, lower levels of empathetic concern were associated with higher levels of relational aggression. Results are discussed within a social information‐processing perspective. Aggr. Behav. 29:430–439, 2003. © 2003 Wiley‐Liss, Inc.     

Are All Preferences Nosy?

The significance which any human action carries for normative reasoning is held to include its causal preconditions as well as its causal consequences. That claim is defended against a series of natural objections. The point is then extended from actions to preferences via discussion of Barry and Dworkin. The grounds for excluding nosy preferences from aggregation must involve appeal not just to rights and intention but also to the consequences of acting on them. But then some of the features in virtue of which nosy preferences are held to be objectionable will also be present in any other preference. This revised version was published online in August 2006 with corrections to the Cover Date.     

A Regression Framework for Causal Mediation Analysis with Applications to Behavioral Science

We introduce and extend the classical regression framework for conducting mediation analysis from the fit of only one model. Using the essential mediation components (EMCs) allows us to estimate causal mediation effects and their analytical variance. This single-equation approach reduces computation time and permits the use of a rich suite of regression tools that are not easily implemented on a system of three equations. Additionally, we extend this framework to non-nested mediation systems, provide a joint measure of mediation for complex mediation hypotheses, propose new visualizations for mediation effects, and explain why estimates of the total effect may differ depending on the approach used. Using data from social science studies, we also provide extensive illustrations of the usefulness of this framework and its advantages over traditional approaches to mediation analysis. The example data are freely available for download online and we include the R code necessary to reproduce our results.     

“We're not gonna be friends anymore”: Associations between viewing relational aggression on television and relational aggression in text messaging during adolescence

A number of studies suggest that adolescents who view relational aggression on television are more likely to engage in higher levels of subsequent relational aggression in social interactions. This study examined longitudinal associations between viewing relational aggression on television and relationally aggressive behavior in text messaging over a 1-year period during adolescence. Participants were 197 adolescents who completed a number of questionnaires regarding media use and aggression. Adolescents were each given a BlackBerry device and a sample of text messages was coded for aggressive behavior. Results revealed that exposure to relational aggression on television was associated with higher levels of relational aggression in texting one year later, but only for girls. Results are discussed with reference to the General Aggression Model.     

正强化和负强化:概念、争议与神经机制

1975年,Michael首次正式提出应放弃"正强化"和"负强化"术语的使用,引起对"正强化和负强化是否本质上具有区别"这一问题的关注和争议。正负强化究竟本质上是否有区分、如何区分、以及区分它们的意义等问题,得到了众多行为心理学家的深入探讨。多数学者再度阐明正强化和负强化具有不同的心理机制,加以区分具有重要应用意义,主张沿用对它们的区分。最近,对正负强化神经机制的研究取得突破性进展,进一步揭示它们具有截然不同的神经相关过程。我们建议,分析强化作用进行时,机体是否在环境条件作用下已经偏离了基础、正常的心理稳态,有助于规范理解强化物启动的是正还是负强化的神经过程。     

When Will a Consequentialist Push You in Front of a Trolley?

As the trolley problem runs its course, consequentialists tend to adopt one of two strategies: (a) silently take comfort in the fact that deontological rivals face their own enduring difficulties, or (b) appeal to cognitive psychology to discredit the deontological intuitions on which the trolley problem depends. I refer to the first strategy as silent schadenfreude and the second as debunking attack. My aim in this paper is to argue that consequentialists ought to reject both strategies and instead opt for what I call robust advantage. This strategy emphasizes the intricate calculations that consequentialists employ to defend against objections based on friendship and integrity. I argue that these calculations offer consequentialism an explanatory advantage over deontology in the context of the trolley problem. It requires striking a delicate balance between deeply internalized dispositions to avoid causing harm and a context-sensitive ability to prevent disasters; however, empirical data help consequentialism on this front by illustrating that the integration of separate cognitive functions is an ordinary part of human psychology.     

Experimental Power for Indirect Effects in Group-randomized Studies with Group-level Mediators

Mediation analyses have provided a critical platform to assess the validity of theories of action across a wide range of disciplines. Despite widespread interest and development in these analyses, literature guiding the design of mediation studies has been largely unavailable. Like studies focused on the detection of a total or main effect, an important design consideration is the statistical power to detect indirect effects if they exist. Understanding the sensitivity to detect indirect effects is exceptionally important because it directly influences the scale of data collection and ultimately governs the types of evidence group-randomized studies can bring to bear on theories of action. However, unlike studies concerned with the detection of total effects, literature has not established power formulas for detecting multilevel indirect effects in group-randomized designs. In this study, we develop closed-form expressions to estimate the variance of and the power to detect indirect effects in group-randomized studies with a group-level mediator using two-level linear models (i.e., 2-2-1 mediation). The results suggest that when carefully planned, group-randomized designs may frequently be well positioned to detect mediation effects with typical sample sizes. The resulting power formulas are implemented in the R package PowerUpR and the PowerUp!-Mediator software (causalevaluation.org).     

Measuring adult indirect aggression: The development and psychometric assessment of the indirect aggression scales

This paper describes the development of a psychometric measure of indirect aggression for use in an adult population. Items were generated from a series of qualitative interviews. Two versions of the scale were developed; the Indirect Aggression Scale Aggressor version (IAS‐A) and Target version (IAS‐T). Both versions of the scale were administered to separate samples (n_A=294; n_T=294). Scales were analysed using item analysis of internal consistency, as well as exploratory factor analysis. Both versions were found to have the same consistent three sub‐scales: social exclusion, use of malicious humour, and guilt induction. Preliminary psychometric evaluation suggests that the scales are both sufficiently reliable (with Cronbach's alphas ranging from .81 to .89) and valid. There were no gender differences in either using or being the victim of indirect aggression, and the behaviour was significantly negatively correlated with age. Future validation and potential usage of the measures are discussed. Aggress. Behav. 31:1–14, 2005. © 2005 Wiley‐Liss, Inc.