Enhanced cognitive activity--over and above social or physical activity--is required to protect Alzheimer's mice against cognitive impairment, reduce Abeta deposition, and increase synaptic immunoreactivity

Although social, physical, and cognitive activities have each been suggested to reduce the risk of Alzheimer's disease (AD), epidemiologic studies cannot determine which activity or combination of activities is most important. To address this question, mutant APP transgenic AD mice were reared long-term in one of four housing conditions (impoverished, social, social+physical, or complete enrichment) from 1(1/2) through 9 months of age. Thus, a stepwise layering of social, physical, and enhanced cognitive activity was created. Behavioral evaluation in a full battery of sensorimotor, anxiety, and cognitive tasks was carried out during the final 5 weeks of housing. Only AD mice raised in complete enrichment (i.e., enhanced cognitive activity) showed: (1) protection against cognitive impairment, (2) decreased brain beta-amyloid deposition, and (3) increased hippocampal synaptic immunoreactivity. The protection provided by enhanced cognitive activity spanned multiple cognitive domains (working memory, reference learning, and recognition/identification). Cognitive and neurohistologic benefits of complete enrichment occurred without any changes in blood cytokine or corticosterone levels, suggesting that enrichment-dependent mechanisms do not involve changes in the inflammatory response or stress levels, respectively. These results indicate that the enhanced cognitive activity of complete enrichment is required for cognitive and neurologic benefit to AD mice-physical and/or social activity are insufficient. Thus, our data suggest that humans who emphasize a high lifelong level of cognitive activity (over and above social and physical activities) will attain the maximal environmental protection against AD.     

Gravity bias in young and adult chimpanzees (Pan troglodytes): tests with a modified opaque-tubes task

Young human children at around 2 years of age fail to predict the correct location of an object when it is dropped from the top of an S-shape opaque tube. They search in the location just below the releasing point (Hood, 1995). This type of error, called a 'gravity bias', has recently been reported in dogs and monkeys. In the present study, we investigated whether young and adult chimpanzees also show such a gravity bias in a modified version of the original opaque-tube task. The original task by Hood and colleagues required the subject to search in a location after the object had fallen, while in the task reported here, subjects were required to predict the location before the object was dropped. Thus the present procedure does not involve explicit invisible displacement operations, one of the important components of the original procedure. In Experiment 1 both young (1.5-2.5-year-old) and adult chimpanzees predicted the location of falling food items below the releasing point even when crossed tubes were used. These gravity errors remained after the extensive experience of using the tubes themselves. Experiment 2 further tested adult and 4-year-old chimpanzees under the set-up in which the straight and crossed tubes were simultaneously presented. The results were the same as those in the previous test, suggesting that developmental changes and learning effect do not affect the gravity bias in chimpanzees.     

Culture, trust, and social networks

Although the role of trust in group processes has been well established, less is known about the role of trust in social network processes. Trust, conceptualized to have generalized and particularistic aspects, was measured by generalized trust (people can be trusted in general) and relationism (people can be trusted if one has relationships), and their relations with social network characteristics of network homogeneity (extent to which one has a number of friends with similar attitudes) and network closure (extent to which one's social network is closed) were examined in three Western (Australia, Germany, and the United Kingdom) and two East Asian countries (Japan and Korea). Although generalized trust was shown to be positively related to network closure across the five countries, generalized trust and relationism had different relations with network homogeneity in different cultures. The results were interpreted in terms of social institutional and cultural differences.     

A paper-format group performance test for measuring the implicit association of target concepts

We developed a paper test utilizing a mechanism for measuring implicit association similar to that used in the Implicit Association Test (IAT; Greenwald, McGhee, & Schwartz, 1998). The target concepts were buried among positive and negative words on a piece of paper. Examinees marked the targets as "bad" or "good" in one task and conversely in the other, along with the evaluative words. Instead of reaction times, we counted the number of words marked in 20 sec for each task. This procedure allowed group administration. We calculated the implicit measure using the difference in the average number of words marked in the task pairs. The results of a test administered to 82 undergraduates with three different targets showed significant correlations (rs = .26-.35) with the results of IAT administered to the same participants. It also showed significant reliability (rs = .56-.71). We discuss the practical usability of the test with application studies conducted in various areas.     

Styles of Remembering and Types of Experience: An Experimental Investigation of Reconstructive Memory

No one can access the original events to examine the veracity of a human experience in everyday situations. The present experiment was done to compare two conditions under which a participant remembered (1) her actual contact with the environment and (2) her indirect experience—information about another person’s direct experience that was communicated to her. Several differences in the forms of remembering such as narrative styles, way of describing and naming of object, motive for actions—were found to differ between those two conditions. Those differences were shown to disappear with repeated remembering occasions due to intrapersonal and interpersonal conventionalization. These results suggest that it is possible to examine the veracity of an experience based on forms of remembering, rather than on its content. Theoretical discussion links the present experiment to the study of memory and remembering from the perspective of Bartlett’s (Remembering: A study in experimental and social psychology. Cambridge: Cambridge University Press, 1932) schema theory.

Underlying Circuits of Social Support for Bullied Victims: An Appraisal‐Based Perspective on Supportive Communication and Postbullying Adjustment

This study examined the working mechanisms of social support for victims of bullying. Structural equation modeling analyses based on retrospective survey data (N = 448) revealed that the effects of supportive messages varied distinctively, depending on the content of the messages; emotional and esteem support enhanced, but network support impeded, positive reappraisal (the effects of informational support were not significant). Except for that which was related to network support, discrepancy between desired and received support was associated with less positive appraisal. Finally, positive appraisal was found to enhance victims' postbullying adjustment both behaviorally and psychologically. These findings are discussed in terms of their theoretical and practical implications with reference to the literature on social support and coping of bullied victims.     

Housing First and Photovoice: Transforming Lives,Communities, and Systems

This article presents findings from a community‐based participatory evaluation of a Housing First program on the Island of O'ahu. In this study, clients in a Housing First program used Photovoice to evaluate the program and to advocate for progressive housing policies. Written together by members of the Housing First Photovoice group, this collaborative article describes the outcomes from both the Housing First program and the Photovoice project and demonstrates the ways in which participatory program evaluations can interact with client‐driven programs like Housing First to produce a cumulative, transformative impact. Findings suggest that community psychologists hoping to re‐engage with community mental health systems through enacting transformative change should consider taking a community‐based participatory approach to program evaluation because increased client voice in community mental health programs and their evaluations can have far‐reaching, transformative impacts for research, practice, and policy.