Capuchins (<Emphasis Type="Italic">Cebus apella</Emphasis>) fail to show an asymmetric dominance effect

The asymmetric dominance effect (ADE) occurs when the introduction of a partially dominated decoy option increases the choice share of its dominating alternative. The ADE is a violation of regularity and the constant-ratio rule, which are two derivations of the independence of irrelevant alternatives axiom, a core tenant of rational choice. The ADE is one of the most widely reported human choice phenomena, leading researchers to probe its origins by studying a variety of non-human species. We examined the ADE in brown capuchin monkeys (Cebus apella), a species that displays many other decision biases. In Experiment 1, we used a touchscreen method to elicit choice-based preferences for food rewards in asymmetrically dominated choice sets. In Experiments 2 and 3, we distinguished between different types of judgments and used a free selection task to elicit consumption-based preferences for juice rewards. However, we found no evidence for the ADE through violations of regularity or the constant-ratio rule, despite the similarity of our stimuli to other human and non-human experiments. While these results appear to conflict with existing literature on the ADE in non-human species, we point out methodological differences—notably, the distinction between value-based and perception-based stimuli—that have led to a collection of phenomena that are difficult to understand under a unitary theoretical framework. In particular, we highlight key differences between the human and non-human research and provide a series of steps that researchers could take to better understand the ADE.     

Are parrots poor at motor self-regulation or is the cylinder task poor at measuring it?

The ability to inhibit unproductive motor responses triggered by salient stimuli is a fundamental inhibitory skill. Such motor self-regulation is thought to underlie more complex cognitive mechanisms, like self-control. Recently, a large-scale study, comparing 36 species, found that absolute brain size best predicted competence in motor inhibition, with great apes as the best performers. This was challenged when three Corvus species (corvids) were found to parallel great apes despite having much smaller absolute brain sizes. However, new analyses suggest that it is the number of pallial neurons, and not absolute brain size per se, that correlates with levels of motor inhibition. Both studies used the cylinder task, a detour-reaching test where food is presented behind a transparent barrier. We tested four species from the order Psittaciformes (parrots) on this task. Like corvids, many parrots have relatively large brains, high numbers of pallial neurons, and solve challenging cognitive tasks. Nonetheless, parrots performed markedly worse than the Corvus species in the cylinder task and exhibited strong learning effects in performance and response times. Our results suggest either that parrots are poor at controlling their motor impulses, and hence that pallial neuronal numbers do not always correlate with such skills, or that the widely used cylinder task may not be a good measure of motor inhibition.     

Spiritual Distress and Depression in Bereavement: A Meaning-Oriented Contribution

One key focus of a meaning reconstruction model of bereavement concerns spiritual meanings attributed to the death, whether consoling or troubling. Specifically, previous studies in our research program suggest that religiously inclined violent death survivors are at risk for elevated levels of both bereavement distress and complicated spiritual grief, a crisis of faith following loss that refers to the erosion of the mourner’s relationship to God and/or the religious community. However, more research is needed to understand the convergence of depression and spiritual struggle in the context of violent and natural loss. In this study of a diverse sample of 59 American Christians bereaved less than 5 years, we sought to: (1) determine if individuals bereaved by homicide, suicide or fatal accident differed from those bereaved by natural causes in their levels of depression and spiritual coping; (2) investigate the relation between the latter constructs; and (3) ascertain if cause of death mediates the effect of religious coping on depression. We found that: (a) violently bereaved individuals endorsed more negative religious coping, and (b) depression was associated with greater spiritual struggle, particularly a sense of disrupted relationship with God. Contrary to expectations, positive religious coping was unrelated to post-loss depression, and cause of death did not mediate the relationship between spiritual coping and depressive symptomatology. A clinical case study concludes the article, illustrating the interweaving of spiritual and psychological distress in tragic bereavement, and their implications for a meaning-oriented grief therapy.     

Child-Oriented or Parent-Oriented Focused Intervention: Which is the Better Way to Decrease Children’s Externalizing Behaviors?

Research has tried to identify risk factors that increase the likelihood of difficulties with externalizing behavior. The relations between individual or environmental factors and externalizing behavior have been especially documented. Child-oriented and parent-oriented interventions have been designed in order to decrease externalizing behavior in preschoolers. To date, however, research has largely been compartmentalized. It is therefore not known whether child-oriented or parent-oriented intervention is more effective in reducing externalizing behavior. The aim of the current study was to answer this question by comparing two 8-week child with two 8-week parent-oriented group programs sharing a common experimental design. This was done in a pseudo-randomized trial conducted with 73 3–6-year-old children displaying clinically relevant levels of externalizing behavior who were assigned to one of the four interventions and 20 control participants who were allocated to a waiting list. The results indicate that the four programs focusing on a specific target variable, i.e., social cognition, inhibition, parental self-efficacy beliefs, or parental verbal responsiveness, are all effective in reducing externalizing behavior among preschoolers. Their effectiveness was moderated neither by their orientation toward the child or the parent nor by their content, suggesting that several effective solutions exist to improve behavioral adaptation in preschoolers. A second important highlight of this study is that, thanks to comparable effect sizes, brief focused programs appear to be a reasonable alternative to long multimodal programs, and may be more cost-effective for children and their families.     

Separating the Effects of Gender and Weight-Loss Desire on Body Satisfaction and Disordered Eating Behavior

The purpose of this study was to separate the effects of gender from those of desired weight loss on body satisfaction and eating disordered behavior. Therefore, we explored gender differences in a sample (N = 191) of men and women who wanted to lose weight. We expected that controlling for desire to lose weight would minimize gender differences; this was supported for (a) overall body dissatisfaction, and (b) degree of concern about, effect of, and importance of weight and appearance. Nevertheless, women reported (a) less satisfaction with several body parts, (b) stronger relations between body satisfaction and self-esteem, and (c) use of more weight-loss strategies. Exploratory analyses also were conducted to examine within-group differences among men. Implications are discussed.     

Race, Culture, and Ethnicity: Implications for a Community Intervention

We present an overview of research on African American families and emphasize in this discussion limitations of approaches used in the past to study African American families. We also discuss and identify challenges for designing and implementing community, family-based programs targeting competence-promoting behaviors in African American families. In addition, we attempt to accomplish the following objectives: (1) identify themes in studies of African American families, including bias in prior research; (2) discuss ways in which prior approaches and conceptual models guiding studies of African Americans have created challenges for the development and implementation of community-based intervention and research programs; and (3) present the Parents Matter! Program as an example of a community-based prevention effort that attempted to overcome many of the challenges created by prior research efforts.     

Monkeys represent others' knowledge but not their beliefs

The capacity to reason about the false beliefs of others is classically considered the benchmark for a fully fledged understanding of the mental lives of others. Although much is known about the developmental origins of our understanding of others' beliefs, we still know much less about the evolutionary origins of this capacity. Here, we examine whether non-human primates - specifically, rhesus macaques (Macaca mulatta) - share this developmental achievement. We presented macaques with a looking-time measure of false belief understanding, one that had recently been developed for use with 15-month-old human infants. Like human infants, monkeys look longer when a human experimenter fails to search in the correct location when she has accurate knowledge. In contrast to infants, however, monkeys appear to make no prediction about how a human experimenter will act when she has a false belief. Across three studies, macaques' pattern of results is consistent with the view that monkeys can represent the knowledge and ignorance of others, but not their beliefs. The capacity to represent beliefs may therefore be a unique hallmark of human cognition.     

Parent Alcoholism Impacts the Severity and Timing of Children’s Externalizing Symptoms

Although previous studies show that children of alcoholic parents have higher rates of externalizing symptoms compared to their peers, it remains unclear whether the timing of children’s externalizing symptoms is linked to that of their parent’s alcohol-related symptoms. Using a multilevel modeling approach, we tested whether children aged 2 through 17 showed elevated mother-, father- and child-reported externalizing symptoms (a) at the same time that parents showed alcohol-related consequences (time-varying effects), (b) if parents showed greater alcohol-related consequences during the study period (proximal effects), and (c) if parents had a lifetime diagnosis of alcoholism that predated the study period (distal effects). We used integrative data analysis to combine samples from two prospective studies to test these hypotheses. Distal effects of parent alcoholism on increased child externalizing symptoms were large and consistent. In addition, proximal and time-varying effects of parent alcohol symptoms were also found. Implications for preventing escalations in externalizing symptoms among this high-risk population are discussed.