In this article, we attempt to distinguish between the properties of moderator and mediator variables at a number of levels. First, we seek to make theorists and researchers aware of the importance of not using the terms moderator and mediator interchangeably by carefully elaborating, both conceptually and strategically, the many ways in which moderators and mediators differ. We then go beyond this largely pedagogical function and delineate the conceptual and strategic implications of making use of such distinctions with regard to a wide range of phenomena, including control and stress, attitudes, and personality traits. We also provide a specific compendium of analytic procedures appropriate for making the most effective use of the moderator and mediator distinction, both separately and in terms of a broader causal system that includes both moderators and mediators.

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The moderator–mediator variable distinction in social psychological research: Conceptual, strategic, and statistical considerations.

Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

Fast parallel algorithms for short-range molecular dynamics

There appears to be general agreement among social psychologists that most human behavior is goal-directed (e. g., Heider, 1958 ; Lewin, 1951). Being neither capricious nor frivolous, human social behavior can best be described as following along lines of more or less well-formulated plans. Before attending a concert, for example, a person may extend an invitation to a date, purchase tickets, change into proper attire, call a cab, collect the date, and proceed to the concert hall. Most, if not all, of these activities will have been designed in advance; their execution occurs as the plan unfolds. To be sure, a certain sequence of actions can become so habitual or routine that it is performed almost automatically, as in the case of driving from home to work or playing the piano. Highly developed skills of this kind typically no longer require conscious formulation of a behavioral plan. Nevertheless, at least in general outline, we are normally well aware of the actions required to attain a certain goal. Consider such a relatively routine behavior as typing a letter. When setting this activity as a goal, we anticipate the need to locate a typewriter, insert a sheet of paper, adjust the margins, formulate words and sentences, strike the appropriate keys, and so forth. Some parts of the plan are more routine, and require less conscious thought than others, but without an explicit or implicit plan to guide the required sequence of acts, no letter would get typed.

From Intentions to Actions: A Theory of Planned Behavior

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Using Multivariate Statistics

Mindfulness is an attribute of consciousness long believed to promote well-being. This research provides a theoretical and empirical examination of the role of mindfulness in psychological well-being. The development and psychometric properties of the dispositional Mindful Attention Awareness Scale (MAAS) are described. Correlational, quasi-experimental, and laboratory studies then show that the MAAS measures a unique quality of consciousness that is related to a variety of well-being constructs, that differentiates mindfulness practitioners from others, and that is associated with enhanced selfawareness. An experience-sampling study shows that both dispositional and state mindfulness predict self-regulated behavior and positive emotional states. Finally, a clinical intervention study with cancer patients demonstrates that increases in mindfulness over time relate to declines in mood disturbance and stress. Many philosophical, spiritual, and psychological traditions emphasize the importance of the quality of consciousness for the maintenance and enhancement of well-being (Wilber, 2000). Despite this, it is easy to overlook the importance of consciousness in human well-being because almost everyone exercises its primary capacities, that is, attention and awareness. Indeed, the relation between qualities of consciousness and well-being has received little empirical attention. One attribute of consciousness that has been much-discussed in relation to well-being is mindfulness. The concept of mindfulness has roots in Buddhist and other contemplative traditions where conscious attention and awareness are actively cultivated. It is most commonly defined as the state of being attentive to and aware of what is taking place in the present. For example, Nyanaponika Thera (1972) called mindfulness “the clear and single-minded awareness of what actually happens to us and in us at the successive moments of perception” (p. 5). Hanh (1976) similarly defined mindfulness as “keeping one’s consciousness alive to the present reality” (p. 11). Recent research has shown that the enhancement of mindfulness through training facilitates a variety of well-being outcomes (e.g., Kabat-Zinn, 1990). To date, however, there has been little work examining this attribute as a naturally occurring characteristic. Recognizing that most everyone has the capacity to attend and to be aware, we nonetheless assume (a) that individuals differ in their propensity or willingness to be aware and to sustain attention to what is occurring in the present and (b) that this mindful capacity varies within persons, because it can be sharpened or dulled by a variety of factors. The intent of the present research is to reliably identify these inter- and intrapersonal variations in mindfulness, establish their relations to other relevant psychological constructs, and demonstrate their importance to a variety of forms of psychological well-being.

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The Benefits of Being Present: Mindfulness and Its Role in Psychological Well-Being

Getting what they came for: How power influences the dynamics and outcomes of interpersonal interaction: Multiple perspectives on the causes of corruption

In this chapter, we review theory and research on strategies of hypothesis testing. We propose that confirmation is the default option in information processing; however, and contrary to common belief, it is not necessarily a lazy strategy and can even have social advantages. Disconfirmation, on the other hand, may be spontaneous and effortless. We also propose that both strategies, confirmation and disconfirmation, can fulfill inclusionary or exclusionary goals. Finally, a last series of experiments illustrates how perceivers can create ingroup biases without resorting either to confirmation or to disconfirmation. In general, we offer a perspective on perceivers as very flexible gatherers and interpreters of information, who use diverse strategies to their functional advantage.

Confirmation and disconfirmation: Their social advantages

When individuals (as perceivers) hold expectations about other people (as targets), they can elicit from these targets behaviors that are consistent with their expectations, even if these expectations are independent of the target’s real characteristics. In this paper, we consider the role that this phenomenon, known as behavioral confirmation, plays in shaping the social perceptions of perceivers, targets, and outside observers. As well, we address the value of laboratory research on behavioral confirmation for understanding the dynamics and outcomes of social interactions in naturally occurring settings. Building on these considerations, we then examine the role of behavioral confirmation phenomena in shaping intergroup relations, with particular reference to delineating conditions in which such phenomena serve to preserve these relations. Based on this analysis, we suggest that dyadic confirmation phenomena are likely to occur in naturally occurring settings and may contribute to the maintenance and perpetuation of social stereotypes and societal structures.

Construing and constructing others

In 1981, the Centers for Disease Control reported the first case of what would come to be known as AIDS. Now, barely a decade later, there are over 200,000 confirmed cases of AIDS in the United States and an estimated 1.5 million Amer icans infected with HIV (the virus that causes AIDS). The World Health Organization projects that, by the year 2000, 30 to 40 million adults and children worldwide will have been infected with HIV, and most of them are expected to develop AIDS.1 Clearly, with neither a vac cine nor a cure in sight, the full im pact of AIDS, as devastating and profound as the epidemic has been, has yet to be felt, and will surely touch all of our lives. Society has responded to the HIV epidemic on a number of fronts, in cluding at least three for which the skills and expertise of psychologists, as scientists and practitioners, can be tapped: (a) providing psycholog ical services for persons living with AIDS (PWAs), (b) developing behav ior change campaigns to reduce the likelihood of HIV transmission, and (c) implementing public education programs to address matters of prej udice and discrimination associated with AIDS and PWAs.2 In our re search, we are examining a remark able social phenomenon born of the HIV epidemic?AIDS volunteerism and its implications for each of these fronts.

Mark Snyder

Papers

Getting what they came for: How power influences the dynamics and outcomes of interpersonal interaction: Multiple perspectives on the causes of corruption

Confirmation and disconfirmation: Their social advantages

Construing and constructing others

Volunteerism and society's response to the HIV epidemic: Social psychology 97/98

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