Primate prefrontal neurons encode the association of paired visual stimuli during the pair-association task

The prefrontal cortex (PFC) is known to contribute to memory processes such as encoding representations into long-term-memory (LTM) and retrieving these representations from LTM. However, the details of the PFC's contribution to LTM processes are not well known. To examine the characteristics of the PFC's contribution to LTM processes, we analyzed single-neuron activity while monkeys performed a pair-association (PA) task using 12 pairs of complex visual images. Among 60 neurons with sample-period activity, 32% showed the strongest and second-strongest sample-period activities when a particular pair of stimuli was presented (pair selectivity). In addition, the mean latency of sample-period activity was 138 ms in the PFC, which was longer than that observed in ITC neurons under bottom-up conditions, but shorter than that under top-down conditions. These results indicate that the PFC participates in encoding and retrieving information in LTM processes and that pair-selective sample-period activity might be a candidate for the top-down signal that the PFC provides to the ITC during the retrieval of information from LTM.     

With a little help from our friends: The impact of cross-group friendship on acculturation preferences

Despite extensive research on intergroup contact and acculturation, our understanding of how contact affects receiving society members’ preferences for acculturation orientation of immigrants over time is still relatively rudimentary. This longitudinal study examined how perceived group similarity and outgroup trust mediate the effects of cross-group friendship on acculturation preferences (culture maintenance and culture adoption) of the receiving society. It was predicted that cross-group friendship would affect acculturation preferences over time, and that these relationships would be partly mediated by outgroup trust and perceived group similarity. A three-wave full longitudinal sample (N = 467 Chilean school students) was analyzed using structural equation modeling. Results confirmed that cross-group friendship longitudinally predicted majority members’ support for the adoption of Chilean culture (via perceived group similarity) and Peruvian culture maintenance (via outgroup trust). Conceptual and practical implications are discussed.     

Association between bullying victimization and physical fitness among children and adolescents

Background/ObjectiveThe aim of the study was to analyze the relationship between being bullied and the physical fitness components, and to determine whether a healthy physical fitness level is related with lower victimization in children and adolescents with overweight and obesity compared to unfit overweight/obese peers. Method:The present cross-sectional study included a total of 7,714 youths (9-17 years), categorized as normal-weight or overweight/obese and fit or unfit according to sex-specific handgrip strength and cardiorespiratory fitness (CRF) cut-points. Bullying (physical, verbal, social exclusion, sexual harassment, and cyberbullying) was assessed through the Standard Health Behavior in School-aged Children survey questions. Results:Boys and girls that were categorized as fit (healthy level of CRF) showed lower traditional bullying compared to unfit counterparts. Also, a healthy level of CRF could be a protective factor of traditional bullying among overweight/obese youths compared to unfit overweight/obese peers. Conclusions:CRF is related with lower risk for experiencing traditional bullying in Latino youths with and without obesity, thus emphasizing the role of fitness even among youth with excess of adiposity.     

Guilt in bereavement: Its relationship with complicated grief and depression

This study investigated the relationship between guilt and well‐being of bereaved persons, and explored potential differences in the associations between guilt‐complicated grief (CG) and guilt‐depression. In total, 1358 Chinese bereaved adults were recruited to fill out questionnaires. Participants (N = 194) who had been bereaved within 2 years of the first survey, filled out the same questionnaires 1 year later. Higher guilt was associated with higher degrees of both CG and depression. The level of guilt predicted CG and depression symptoms 1 year later. Bereavement‐related guilt has a closer association with CG than depression. Responsibility guilt, indebtedness guilt and degree of guilt feeling are more prominent aspects of guilt in CG than in depression. These findings demonstrate the significant role of guilt (perhaps a core symptom) in mental health of the bereaved, having implications for identifying persons with grief complications and depression.     

Reports of attempted suicide among Brazilian addicts

Both substance dependence and depressive mood seem to be associated with increased suicide risk. Clinical information on suicide attempts and depressive symptoms were obtained from a sample of 211 psychoactive substance dependents attending a university clinic program for addicts in Brazil. 49 subjects (23.4%) had attempted suicide at least once, and the frequency of reporting attempts was 4.32 times greater among women than among men. Male addicts also tended to engage in potentially more dangerous attempt methods than women. Depressive male addicts were 2.17 times more likely to have attempted suicide than nondepressive addicted men. Among women, no association could be established between having attempted suicide and the presence of depression. Substance addicts have a relatively high risk of attempting suicide and the co-occurrence of depression seems to increase prevalence of suicidal behavior among men.     

Psychometric properties and validation of the Portuguese version of the Anxiety Control Questionnaire Revised (ACQ-R)

Current Psychology - Early experiences appear to influence the sense of unpredictability and uncontrollability of both life events and emotions in vulnerable individuals. The perception of low...     

Reliance on Numerical Precision: Compatibility between Accuracy versus Efficiency Goals and Numerical Precision Level Influence Attribute Weighting in Two‐Stage Decisions

This research examines how the weighting of an attribute is jointly affected by attribute precision and decision stage. Building on prior work suggesting (a) that less (more) precise numerical values are easier to process (more accurate), (b) that decision‐makers' motivation to be efficient (accurate) is greater when creating a consideration set (making a final choice), and (c) that decision‐makers tend to overweight information that is compatible with their goals, we hypothesize that when creating a consideration set (making a choice) participants tend to assign greater weight to less (more) precise attributes. Five studies (two of them reported in the Appendix S1) offer triangulating evidence for these predictions. Overall, this work contributes to research on numerical cognition, efficiency versus accuracy trade‐offs, attribute weighting, and two‐stage decisions.     

Economic Poverty and Happiness in Rural Ecuador: the Importance of <Emphasis Type="Italic">Buen Vivir</Emphasis> (Living Well)

This research paper addresses the endemic dimensions of having or not having a good life using a concept of poverty based on self-reported subjective well-being. We build a subjective well-being poverty (SWBP) line and compare it with two income poverty (IP) lines. The endemic dimension comes from rural Ecuador and the indigenous happiness idea of Buen Vivir (Living Well), which has been the focus of growing attention in the scientific and the political arena. Discrepancies between SWBP and IP are deeply explored building models that explain SWBP with IP, as well as control variables and Buen Vivir related variables. We show that income poor households are more likely to be poor in terms of their reported subjective well-being. However, households that grow their own food and are in an indigenous community are less likely to report to be subjective well-being poor. The results suggest that low SWBP values in contrast with high IP may be explained by idiosyncratic components of the Buen Vivir philosophy. The components of the Buen Vivir ethos related to SWBP give rise to the idea of building multidimensional concepts of poverty based on what ethnic people consider to be good or bad for their specific way of life. In a general context, our study raises the importance of considering poverty and its dimensions taking into account the endemic factors of specific groups of people and cultures. That is, to take into account what is important for their lives.     

Executive Function and Theory of Mind in Children with ADHD: a Systematic Review

In developmental research, the relationship between Executive Function (EF) and Theory of Mind (ToM) has been extensively assessed, and EF has been considered a condition for ToM. However, few researchers have studied the relationship between EF and ToM in clinical populations, especially that of Attention Deficit Hyperactivity Disorder (ADHD), a neurodevelopmental disorder characterized by symptoms of inattention and motor hyperactivity/impulsivity, in which EF is largely impaired. Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) model, 201 English and Spanish articles evaluating EF and ToM in ADHD were chosen. Fifteen papers met the inclusion criteria and were selected for further analysis. The first study dates from 2001. Most of the studies’ designs are cross-sectional, include mostly male children, have a small sample size, and were conducted in European countries. Unlike tasks assessing EF, tasks assessing ToM were heterogeneous across studies. The EFs most correlated with ToM were inhibitory control, working memory, cognitive flexibility, and attention. Interest in studying the relationship between EF and ToM in ADHD is recent,but increasing based on new findings and tuning of ToM instruments. However, while an association between EF and ToM is indicated in ADHD, the degree of prediction and predictability of one over the other cannot yet be established because of the studies’ heterogeneity.     

Compensatory processing during rule-based category learning in older adults

Healthy older adults typically perform worse than younger adults at rule-based category learning, but better than patients with Alzheimer’s or Parkinson’s disease. To further investigate aging’s effect on rule-based category learning, we monitored event-related potentials (ERPs) while younger and neuropsychologically typical older adults performed a visual category-learning task with a rule-based category structure and trial-by-trial feedback. Using these procedures, we previously identified ERPs sensitive to categorization strategy and accuracy in young participants. In addition, previous studies have demonstrated the importance of neural processing in the prefrontal cortex and the medial temporal lobe for this task. In this study, older adults showed lower accuracy and longer response times than younger adults, but there were two distinct subgroups of older adults. One subgroup showed near-chance performance throughout the procedure, never categorizing accurately. The other subgroup reached asymptotic accuracy that was equivalent to that in younger adults, although they categorized more slowly. These two subgroups were further distinguished via ERPs. Consistent with the compensation theory of cognitive aging, older adults who successfully learned showed larger frontal ERPs when compared with younger adults. Recruitment of prefrontal resources may have improved performance while slowing response times. Additionally, correlations of feedback-locked P300 amplitudes with category-learning accuracy differentiated successful younger and older adults. Overall, the results suggest that the ability to adapt one’s behavior in response to feedback during learning varies across older individuals, and that the failure of some to adapt their behavior may reflect inadequate engagement of prefrontal cortex.