The influence of functional social support on executive functioning in middle-aged African Americans

Social support has a positive influence on cognitive functioning and buffers cognitive decline in older adults. This study examined the relations between social support and executive functioning in middle-aged adults. A community-based sample of African Americans completed the Interpersonal Support Evaluation List, a measure of functions of social support, and two measures of executive functioning, the Stroop Color and Word Test and the Wisconsin Card Sorting Test (WCST). Hierarchical regression analyses were used to explore the hypothesis that different facets of perceived social support influence performance on measures of executive functioning. After controlling for age, gender, and education, social support facets including belonging support, self-esteem support, appraisal support, and tangible support were significant predictors of Stroop performance. In addition, tangible support significantly predicted WCST performance. These findings add to previous literature on social support and cognition; however, findings for middle-aged adults are unique and suggest that social support has a positive influence on some executive functions in African Americans prior to old age.     

Profiling key purchase influencers: Those perceived as consumer savvy

The concept of consumer intelligence or consumer savvy is defined and the way in which this can be measured is examined with a view to determining if and how being perceived to be savvy affects decision‐making influence in a family setting in the UK. A sample of 524 matched pairs (mother and her child) drawn from the TNS postal panel responded to a questionnaire that determined the mother's perception of how savvy her child is with regard to shopping in general and with regard to two product categories (casual clothes for the child and a summer holiday). The child's reported influence on decision making in these categories as well as their money management is also explored. The children perceived to be more savvy were female and older. Mothers in lower socio‐economic groups were also more likely to perceive their children as ‘savvy’. The more savvy children were more involved in the purchase decision process. Implications and future research avenues are presented. Copyright © 2011 John Wiley & Sons, Ltd.     

Opportunistic propensity hinders commitment to acts in conditions of forced compliance and compliance without pressure

The psychosocial literature contains empirical evidence of the effects of personality variables on commitment to acts. The association of economic opportunism was explored with respect to postexperimental attitude change, intentions, and intrinsic motivation of individuals (N=132) toward acts with either forced compliance or compliance without pressure. In conditions of commitment and compliance without pressure, both intention and intrinsic motivation decreased as economic opportunism increased, while in conditions of commitment and forced compliance, intention increased as economic opportunism increased. Attitude change and economic opportunism did not appear to be associated in any experimental condition. These findings suggest that tendency to noncooperativeness predisposes to reduced concern for consistency and compliance with performed acts.     

Neuroanatomy and Neuropathology Associated with Korsakoff’s Syndrome

Although the neuropathology of Korsakoff's syndrome (KS) was first described well over a century ago and the characteristic brain pathology does not pose a diagnostic challenge to pathologists, there is still controversy over the neuroanatomical substrate of the distinctive memory impairment in these patients. Cohort studies of KS suggest a central role for the mammillary bodies and mediodorsal thalamus, and quantitative studies suggest additional damage to the anterior thalamus is required. Rare cases of KS caused by pathologies other than those of nutritional origin provide support for the role of the anterior thalamus and mammillary bodies. Taken together the evidence to date shows that damage to the thalamus and hypothalamus is required, in particular the anterior thalamic nucleus and the medial mammillary nucleus of the hypothalamus. As these nuclei form part of wider memory circuits, damage to the inter-connecting white matter tracts can also result in a similar deficit as direct damage to the nuclei. Although these nuclei and their connections appear to be the primary site of damage, input from other brain regions within the circuits, such as the frontal cortex and hippocampus, or more distant regions, including the cerebellum and amygdala, may have a modulatory role on memory function. Further studies to confirm the precise site(s) and extend of brain damage necessary for the memory impairment of KS are required.     

Consolidation and translation regulation

mRNA translation, or protein synthesis, is a major component of the transformation of the genetic code into any cellular activity. This complicated, multistep process is divided into three phases: initiation, elongation, and termination. Initiation is the step at which the ribosome is recruited to the mRNA, and is regarded as the major rate-limiting step in translation, while elongation consists of the elongation of the polypeptide chain; both steps are frequent targets for regulation, which is defined as a change in the rate of translation of an mRNA per unit time. In the normal brain, control of translation is a key mechanism for regulation of memory and synaptic plasticity consolidation, i.e., the off-line processing of acquired information. These regulation processes may differ between different brain structures or neuronal populations. Moreover, dysregulation of translation leads to pathological brain function such as memory impairment. Both normal and abnormal function of the translation machinery is believed to lead to translational up-regulation or down-regulation of a subset of mRNAs. However, the identification of these newly synthesized proteins and determination of the rates of protein synthesis or degradation taking place in different neuronal types and compartments at different time points in the brain demand new proteomic methods and system biology approaches. Here, we discuss in detail the relationship between translation regulation and memory or synaptic plasticity consolidation while focusing on a model of cortical-dependent taste learning task and hippocampal-dependent plasticity. In addition, we describe a novel systems biology perspective to better describe consolidation.     

The heat of transport of vacancies in solid argon

Abstract

Computer simulations of the motion of vacancies in a Lennard-Jones model of solid argon have been made by the molecular dynamics technique. The results have been used to evaluate and analyse the heat of transport parameter Q*v for vacancies in this substance. At a temperature of 30 K it is found to be -12 kJ mol-1. The theory of transport shows that there are three main contributions to this quantity coming from the fluxes of kinetic energy, potential energy and a virial of the forces related to the local stress tensor. The main contribution to Q*v is found to be that from the virial term. This explains why discussions that aim to relate the heat of transport to the corresponding enthalpy of activation (which is almost entirely potential energy) have not been successful.     

Short report: The impact of measurement conditions on the validity of self-assessment in a selection setting

Two experimental studies investigated the impact of format and instructions on the validity of SAs, using participants applying for junior management positions in a public sector organization. In Study 1 (607 participants) self-assessments (SAs) were valid when applicants rated overall competencies or the same competencies broken down into discrete elements, but not when providing behavioural evidence prior to rating competencies. The effect of social comparison instructions was also explored but found to have no impact on validity. Study 2 used a subset of 193 candidates from the previous study who attended the next stage of the selection process. Consistent with predictions it was found that unbalanced, positively toned scales were more valid than conventional scales, and highest validities were achieved when used with instructions requesting a realistic SA of strengths and weaknesses. Interestingly, gender differences were found in both studies. These findings are discussed in terms of their implications for both research and practice.     

Differences in kata performance time and distance from a marker for experienced Shotokan karateka under normal sighted and blindfolded conditions

10 experienced Shotokan karateka were tested on performance time and distance from a marker on the five Heian kata under normal sighted and blind-folded conditions. Whilst each kata's line of movement is different, it is the intention to start and finish at the same location. Analysis showed that despite an average of 16.8 yr. of training, whilst timing was not significantly affected on four of the kata by subjects being deprived of the visual sense, the group's mean change in distance from an original marker was significant for performances on three of the kata.     

Psychological androgyny and ego development

Psychological androgyny has often been described as associated with increased behavioral flexibility, with the availability of skills in both traditionally masculine and feminine areas. Ego development has been described as involving an increasing differentiation of one's perception of self, of behavior, and of one's thoughts and feelings, as well as an increasing ability to integrate these differentiated aspects. We therefore predicted that androgynous individuals would show higher levels of ego development than sex-typed individuals, who would in turn be higher than undifferentiated subjects. Eighty-four undergraduate and graduate students completed the Washington University Sentence Completion Test and the Personality Research Form AN-DRO scale. No evidence of a relation between these measures was found. Several other negative findings have recently been reported, using other sex role measures. It appears that ego development, as currently measured, is not associated with sex-related self-concepts, as typically measured, though it may be associated with more androgynous sex role expectations of others, and with self-perceptions of agency and communion. Measures of sex-related self-concepts that provide separate scores for positive and negative attributes should be employed in future studies.This report is based on a thesis conducted by the first author in partial fulfillment of requirements for a master's degree in psychology, under the supervision of the second author. The authors are grateful to Leo Goldberger, Bob Holt, and an anonymous reviewer for helpful comments on an earlier draft of this report.