Cognitive effects of racial diversity: White individuals’ information processing in heterogeneous groups

Two experiments tested the hypothesis that mere anticipation of membership in a racially heterogeneous group can lead White individuals to exhibit more thorough information processing. In Study 1 White participants who expected to discuss a race-relevant topic with a racially diverse group exhibited better comprehension of topical background readings than did Whites assigned to all-White groups. Study 2 replicated these results and indicated that the processing effects were attributable in part to an increase in race-relevant thought activation among White individuals in a diverse setting. No such anticipatory effects of racial composition were observed for Whites expecting to discuss race-neutral topics. Taken together, these studies render untenable the assumption that the observable effects of racial diversity are wholly attributable to the novel contributions of non-White group members. More generally, they emphasize the need for additional empirical investigation of the cognitive processes through which racial heterogeneity influences individual and group performance.     

The value of distrust

We assume that a state of distrust is the mental system’s signal that the environment is not normal—things may not be as they appear. Hence, individuals sense they should be on guard. In particular, they are likely to avoid routine strategies, ones proven to be optimal and regularly used in normal environments, because these strategies are easily anticipated by whoever may be seeking to deceive them. Conversely, a state of trust is associated with a feeling of safety. The environment is as it normally is and things really are as they appear to be. Thus, individuals see no reason to refrain from doing what they routinely do. Accordingly, we hypothesize that figuring out a new situation depends on the type of environment and the actor’s state of mind: in normal environments, where routine strategies are optimal, individuals who trust should outperform those who distrust; however, in unusual environments, where non-routine strategies are optimal, individuals who distrust should outperform those who trust. This paper reports three experiments that manipulate distrust via orienting tasks that participants perform prior to attempting to predict a series of events (Experiments 1 and 2) or solve matchstick arithmetic problems (Experiment 3). Performance success depends on discovering and implementing an appropriate rule. We found that, as predicted, the manipulation of distrust sensitized participants to the existence of non-routine contingencies, that is, contingencies that were not expected.     

Selective exposure and decision framing: The impact of gain and loss framing on confirmatory information search after decisions

When people make decisions, they often prefer to receive information that supports rather than conflicts with their decision. To date, this effect has mainly been investigated in the context of decisions about gains, whereas decisions about losses have received less attention. Based on Prospect Theory, we expected information search to be differently affected by whether people previously have decided about gains or losses. Three studies have revealed that selectivity of information search is stronger after gain-framed rather than after loss-framed decision problems. An investigation of the underlying psychological processes revealed that gain decisions are made with increased subjective decision certainty (i.e. they are easier and less effortful to make), which in turn systematically increases confirmatory information search.     

Development of visual center of mass localization for grasp point selection

Adults assess precisely the center of mass (CM) of single-bodied objects and choose grasping points that span an axis through or close to the center of mass when lifting them. The present study examined how children and adults assess the CM when lifting two-bodied objects (barbells) and how this ability develops. Four- to five-year olds, 6- to 7-year olds, 9- to 11-year olds and adults were required to grasp and lift symmetrically and asymmetrically proportioned miniature barbells and their grasping points were recorded. While the 4- to 5-year olds grasped near the center of the barbell, accuracy of assessing the correct CM improved linearly with age. Although adults grasped close to the CM, their CM determination follows only an approximation of the physical law.     

General information in relevant logic

This paper sets out a philosophical interpretation of the model theory of Mares and Goldblatt (The Journal of Symbolic Logic 71, 2006). This interpretation distinguishes between truth conditions and information conditions. Whereas the usual Tarskian truth condition holds for universally quantified statements, their information condition is quite different. The information condition utilizes general propositions. The present paper gives a philosophical explanation of general propositions and argues that these are needed to give an adequate theory of general information.     

Privacy and Social Stratification

This article notes ways that power is central to questions of personal information access and use. New surveillance technologies are likely to sustain and even strengthen traditional forms of social stratification. Yet power is rarely a zero-sum game. A number of factors that limit unleashing the full potential of privacy-invading technology, even in contexts of inequality, are considered: legal and moral normative constraints on power holders; the logistical and economic limits on total monitoring; the interpretive, contextual, and indeterminate nature of many human situations; system complexity and interconnectedness; human inventiveness; and the vulnerability of those engaged in surveillance to be compromised or responded to in kind.     

Categorization in compulsive hoarding

Based on hypothesizing about the role of information processing, and in particular, underinclusive categorization in compulsive hoarding, this study examined categorization processes in people with clinically significant compulsive hoarding problems. Twenty-one participants with primary compulsive hoarding, 21 with OCD without hoarding, and 21 non-psychiatric controls completed three categorization tasks. Hoarding and OCD participants reported significantly more distress prior to each of the three tasks than did controls. On tasks sorting common household items, the groups did not differ on the number of piles created nor on the amount of time taken to sort. However, on a task sorting personally relevant items, hoarding participants took more time, created more piles, and reported more anxiety than non-psychiatric controls. Hoarders also took more time than the OCD group, and tended to create more piles. Hoarding severity was correlated with the number of piles created, but only when the objects were personally relevant. Results support under-inclusive categorizing for people with compulsive hoarding, but the effect was largely confined to objects of personal relevance.     

L’influence longitudinale de la justice organisationnelle sur le bien-être psychologique au travail : quels types de justice sont déterminants ?

Regarding the relationship between perceived organizational justice and psychological well-being at work, few studies compare the influence of the four organizational justice facets, and even fewer do so longitudinally. The objective of this study is to evaluate the longitudinal relationships between these facets and psychological well-being at work. Social exchange theory suggests that distributive, interpersonal, and informational justices are better predictors of well-being than procedural justice. A sample of 192 Canadian workers from a diversity of occupations completed two self-reported questionnaires at a six-month interval. Results support the importance of rewards allocation (distributive justice) and information given on this allocation (informational justice) to promote workers’ well-being.