A neural model of hippocampal–striatal interactions in associative learning and transfer generalization in various neurological and psychiatric patients

Building on our previous neurocomputational models of basal ganglia and hippocampal region function (and their modulation by dopamine and acetylcholine, respectively), we show here how an integration of these models can inform our understanding of the interaction between the basal ganglia and hippocampal region in associative learning and transfer generalization across various patient populations. As a common test bed for exploring interactions between these brain regions and neuromodulators, we focus on the acquired equivalence task, an associative learning paradigm in which stimuli that have been associated with the same outcome acquire a functional similarity such that subsequent generalization between these stimuli increases. This task has been used to test cognitive dysfunction in various patient populations with damages to the hippocampal region and basal ganglia, including studies of patients with Parkinson’s disease (PD), schizophrenia, basal forebrain amnesia, and hippocampal atrophy. Simulation results show that damage to the hippocampal region—as in patients with hippocampal atrophy (HA), hypoxia, mild Alzheimer’s (AD), or schizophrenia—leads to intact associative learning but impaired transfer generalization performance. Moreover, the model demonstrates how PD and anterior communicating artery (ACoA) aneurysm—two very different brain disorders that affect different neural mechanisms—can have similar effects on acquired equivalence performance. In particular, the model shows that simulating a loss of dopamine function in the basal ganglia module (as in PD) leads to slow acquisition learning but intact transfer generalization. Similarly, the model shows that simulating the loss of acetylcholine in the hippocampal region (as in ACoA aneurysm) also results in slower acquisition learning. We argue from this that changes in associative learning of stimulus–action pathways (in the basal ganglia) or changes in the learning of stimulus representations (in the hippocampal region) can have similar functional effects.     

Sibship size, birth order, and personality

In a sample of 273 American college students who were administered seven personality tests, only death obsession scores were consistently associated with sibship size and birth order (not optimism, pessimism, anxiety, a Taoist orientation, suicidal ideation, or obsessive-compulsive tendencies).     

A Note on Neat Reducts

SC, CA, QA and QEA denote the class of Pinter’s substitution algebras, Tarski’s cylindric algebras, Halmos’ quasi-polyadic and quasi-polyadic equality algebras, respectively. Let . and . We show that the class of n dimensional neat reducts of algebras in K _m is not elementary. This solves a problem in [2]. Also our result generalizes results proved in [1] and [2]. Presented by Robert Goldblatt     

Examining college students' food security coping strategies and experiences during the COVID-19 pandemic

College students' food situations may have been disrupted by the COVID-19 pandemic, which could have affected their health and well-being. However, little is known about how the pandemic impacted students' food experiences and how students coped with food-related disruptions, particularly from the student's own perspective. This study reviews data from 571 undergraduates who attended public colleges during Fall 2021 and Spring 2022 and wrote a narrative about the pandemic's impact on their food experiences. Most students indicated they experienced a wide range of food difficulties and adapted new food practices. Despite these challenges, students emphasized proactive coping strategies and positive pandemic outcomes rather than difficulties and negative outcomes. These findings have implications for students' long-term health and well-being.     

Sex differences in symptoms of depression among American children and adolescents

The Arabic Children's Depression Inventory in its English version was administered to a sample of 535 U.S. school students (11 to 18 years old). By sex, differences on total score and on 19 of 27 items (70.4%) were not statistically significant. Nevertheless, differences were significant for 8 (29.6%) items on which girls had higher mean scores. Half of the items were positive indicators of depression (I am sad, I feel lonely, I feel miserable, and I hate myself), while the other half were negative (I feel happy, Life is rosy, A lot of people like me, and I am optimistic).     

Temperament and self‐based correlates of cooperative,competitive and individualistic learning preferences

People vary in the extent to which they prefer cooperative, competitive or individualistic achievement tasks. In this research, we conducted two studies designed to investigate correlates and possible roots of these social interdependence orientations, namely approach and avoidance temperament, general self‐efficacy, implicit theories of intelligence, and contingencies of self‐worth based in others' approval, competition and academic competence. The results indicated that approach temperament, general self‐efficacy and incremental theory were positively related, and entity theory was negatively related to cooperative preferences (|r| range from .11 to .41); approach temperament, general self‐efficacy, competition contingencies and academic competence contingencies were positively related to competitive preferences (|r| range from .16 to .46); and avoidance temperament, entity theory, competitive contingencies and academic competence contingencies were positively related, and incremental theory was negatively related to individualistic preferences (|r| range from .09 to .15). The findings are discussed with regard to the meaning of each of the three social interdependence orientations, cultural differences among the observed relations and implications for practitioners.     

Facebook as a virtual mosque: the online protest against Innocence of Muslims

When the short anti-Islam film the Innocence of Muslims was first posted on YouTube in English, no tangible reactions were seen in the Arab world. However, when the same producer dubbed it into Arabic and posted it on YouTube, street protests started around some parts of the Arab world. The study reported here examines a popular Facebook page identified as The global campaign to counter the hurtful film against the Prophet Muhammed that was created to protest against the Innocence of Muslims film. This study investigated all 6949 Facebook updates and comments that were available on this page by 15 October 2012 and found that a clear majority of posts were Pro-Islamic focusing on prayers for Muhammed and supplications to defend him. This study advances our theoretical understanding of the connection between online and offline religion by providing empirical evidence in relation to this controversial incident.     

nAch, risk-taking propensity, locus of control and entrepreneurship

Seventy-one entrepreneurs and 62 non-entrepreneurs were given tests of Locus of Control and Risk-taking Propensity, as well as nAch. Significant differences were found and led to a clarification of the concept of entrepreneurship.