Using hippocampal-striatal loops for spatial navigation and goal-directed decision-making

The hippocampus plays a central role in spatial representation, declarative and episodic memory. In this area, so-called place cells possess high spatial selectivity, firing preferentially when the individual is within a small area of the environment. Interestingly, it has been found in rats that these cells can be active also when the animal is outside the location or context of their corresponding place field producing so-called "forward sweeps". These typically occur at decision points during task execution and seem to be utilized, among other things, for the evaluation of potential alternative paths. Anticipatory firing is also found in the ventral striatum, a brain area that is strongly interconnected with the hippocampus and is known to encode value and reward. In this paper, we describe a biologically based computational model of the hippocampal-ventral striatum circuit that implements a goal-directed mechanism of choice, with the hippocampus primarily involved in the mental simulation of possible navigation paths and the ventral striatum involved in the evaluation of the associated reward expectancies. The model is validated in a navigation task in which a rat is placed in a complex maze with multiple rewarding sites. We show that the rat mentally activates place cells to simulate paths, estimate their value, and make decisions, implementing two essential processes of model-based reinforcement learning algorithms of choice: look-ahead prediction and the evaluation of predicted states.     

Processing of representations in declarative and procedural working memory

The article investigates the relation between declarative and procedural working memory (WM; Oberauer, 2009). Two experiments test the assumption that representations in the two subsystems are selected for processing in analogous ways. Participants carried out a series of decisions on memorized lists of digits. For each decision, they had to select declarative and procedural representations. Regarding declarative representations, participants selected a memory set and a digit within this set as the input to each decision. With respect to the procedural representations, they selected a task set to be applied to the selected digit and a response within that task set. We independently manipulated the number of lists and the number of tasks to be switched among (one, two, or three; Experiment 1) and preparation time for a list switch (Experiment 2). For three effects commonly observed in task-switch studies, analogues in declarative WM were found: list-switch costs, mixing costs, and residual switch costs. List- and task-switch costs were underadditive, suggesting that declarative and procedural representations are selected separately and in parallel. The findings support the hypothesis of two analogous WM subsystems.     

Not Much More Than g? An Examination of the Impact of Intelligence on NFL Performance

The purpose of this study was to determine the efficiency and equity of general mental ability (GMA) in a nontraditional employment setting—professional football. The National Football League (NFL) uses a measure of GMA, the Wonderlic Personnel Test, to evaluate potential draftees in an assessment-style environment. A total of 762 NFL players, represented from three draft classes, were included in our sample. In terms of efficiency, results indicated that GMA was unrelated to (a) future NFL performance, (b) selection decisions during the NFL Draft, and (c) the number of games started in the NFL. In regards to equity, differential prediction analyses by race suggested only the existence of intercept bias. The implications of these findings to the NFL and the selection literature are further discussed.     

Epitaxial growth of electrodeposited cadmium selenide on (111) gallium arsenide

Epitaxial growth of CdSe has been achieved on (111) GaAs by electrodeposition from an aqueous electrolyte. The structure of the film corresponds to the cubic modification of CdSe. The quality of epitaxy has been investigated by reflection high-energy electron diffraction, transmission electron microscopy and X-ray diffraction techniques.     

False belief and emotion understanding in monozygotic twins,dizygotic twins and non-twin children

This study investigated the understanding of false belief and emotion in monozygotic (MZ) and same-sex dizygotic (DZ) twin pairs compared to non-twin children. Aged 3;9 to 5;1 years, the children (N=123) were administered three false belief and three emotion understanding tasks. Age, family socioeconomic status, mother's level of education and language abilities were controlled. Results showed no difference between the three groups in false belief understanding. On emotion tasks, non-twin children and DZ twins did not differ from each other, but they both performed better than MZ twins. Results are discussed in terms of the Peterson's (2000) variety hypothesis and suggest that the affective closeness experienced by MZ twins might interfere with their understanding of others’ emotions.     

Cognitive Mediators of Age-Related Differences in Language Comprehension and Verbal Memory Performance

The present study tried to specify how much processing speed, working memory capacity, and inhibition capability contribute to the effects of aging on language performance. An individual-differences approach was used to examine the component processes that predict performance in language comprehension and verbal long-term memory tasks. A total of 151 participants aged 31-80 completed language processing tasks and a battery of tasks designed to assess processing speed, working memory, and resistance to interference. Latent-construct structural equation modeling was used to examine the relationships of these factors and age to different types of language tasks. The best fit model showed first that all the significant relationships between age and language performance are mediated through reductions in speed, resistance to interference, and working memory; this confirms the validity of the general factor approach of age-related differences in cognitive performance. The best fit model, however, also showed that the contribution of speed and resistance to interference is indirect and mediated by working memory, which appears to play a crucial role in explaining age-related differences in language performance.     

An Examination of Aggressive Beliefs and Attitudes in Relation to Political Affiliation and Candidate Endorsement in the United States

Abstract

Social cognition provides insight into why Americans are largely divided with strong partisan rifts. The purpose of this set of studies was to examine social cognitive forms of aggression in relation to political party affiliation and political candidate endorsement. In Study 1 (N?=?1,657), all forms of aggressive social cognitions (hostile attribution, potency, retribution, victimization by powerful others, derogation of target, and social discounting) were significantly associated with one or more political parties in some respect (Democrat, Republican, Independent). In Study 2 (N?=?579), participants who endorsed Bernie Sanders reported higher scores on victimization, while participants who endorsed Donald Trump reported scores high on potency (social cognitive forms of aggression were unrelated to support for Hillary Clinton or Ted Cruz beyond political ideology). Results suggest that current political division goes beyond mere differences in political ideology as fundamental aggression-related individual differences appear to covary with how partisans see political parties and primary candidates. Implications include the potential application of our findings to better managing political interpersonal dynamics. For example, knowing that divergent political beliefs and behaviors are associated with fundamental differences in how people perceive the same stimuli may ease partisan hostility, facilitate dialog, and increase willingness to compromise.     

Latin America 1520–1600: a page in the history of the study of religion

This article examines the texts written by the first generation of missionaries on the beliefs and mores of the indigenous people of what came to be called Mexico and Peru, supplemented by some accounts written by travelers in Brazil. These works claimed to put forward knowledge about ‘the others’. It is argued that they were important precursors for the study of religion and should receive more attention as such. The issue of location is shown to be always present in this early material, along with the biological notion of hybridization. The conclusion asks whether the contemporary pursuit of knowledge can move from the biological unity of the human race to a view of the race as a social whole with common interests.     

Child maltreatment as a global phenomenon: From trauma to prevention

Past studies have clearly showed the negative impact of neglect and abuse on child development at both the psychological and neurobiological levels. To date, many studies have focused on identifying risk and protective factors occurring at all levels of the ecology. However, more distal‐level variables, such as culture and ethnicity, have not been studied as much as those of more proximal levels; yet studies in Western countries have consistently found an overrepresentation of child maltreatment reports among ethnic minority groups. In this commentary, we reflect on a series of articles examining maltreatment from a crosscultural perspective and using samples of diverse countries. Taken together, studies in this special section document the terrible fact that maltreatment is a global phenomenon. Through a summary of these studies’ main findings and concerns, we highlight four key points that we believe are important to consider for future research and intervention efforts.