NMDA signaling in CA1 mediates selectively the spatial component of episodic memory

Recent studies focusing on the memory for temporal order have reported that CA1 plays a critical role in the memory for the sequences of events, in addition to its well-described role in spatial navigation. In contrast, CA3 was found to principally contribute to the memory for the association of items with spatial or contextual information in tasks focusing on spatial memory. Other studies have shown that NMDA signaling in the hippocampus is critical to memory performance in studies that have investigated spatial and temporal order memory independently. However, the role of NMDA signaling separately in CA1 and CA3 in memory that combines both spatial and temporal processing demands (episodic memory) has not been examined. Here we investigated the effect of the deletion of the NR1 subunit of the NMDA receptor in CA1 or CA3 on the spatial and the temporal aspects of episodic memory, using a behavioral task that allows for these two aspects of memory to be evaluated distinctly within the same task. Under these conditions, NMDA signaling in CA1 specifically contributes to the spatial aspect of memory function and is not required to support the memory for temporal order of events.     

Energetic Cost and Stability during Human Walking at the Preferred Stride Frequency

The possibility that preferred modes of locomotion emerge from dynamical and optimality constraints and the energetic and dynamical constraints on preferred and predicted walking frequency are explored in this article. Participants were required to walk on a treadmill at their preferred frequency, at a frequency predicted as the resonance of a hybrid pendulum-spring model of the legs, and at frequencies ±15%, ±25%, ±35% of the predicted frequency. Walking at the preferred and predicted frequencies resulted in minimal metabolic costs and maximal stability of the head and joint actions. Mechanical energy conservation was constant across conditions. The head was more stable than the joints. The joints appeared to be in service of the head in maintaining a stable trajectory. The major findings of this study suggest a complementary relationship between energetic (physiological) and stability constraints in the adoption of a preferred frequency of walking. Multiple subsystems may be involved in constraining observed macroscopic behavior in intact biological systems. The approach and results of the study imply that a useful tack in understanding how dynamical control structures arise is to study the potential criteria that serve to act as constraints on skilled movement patterns in unimpaired and impaired populations.     

A Review of Carolyn Chen’s <Emphasis Type="Italic">Getting Saved in America: Taiwanese Immigration and Religious Experience</Emphasis>

Carolyn Chen’ Getting Saved in America: Taiwanese Immigration and Religious Experience examines the impact of immigration on the religious practices of Taiwanese American Christians and Buddhists. In particular, the author studies how recent immigrants from Taiwan either convert to evangelical forms of Christianity or identify as explicit Buddhists as a way to remake the self in a particularly American context. By offering a dual tradition focus, the author provides significant insight into the relationship between gender, religious, and ethnic identities for Taiwanese Americans. Reviewing the centrality of religion in the lives of Taiwanese American Christians and Buddhists and its similar function in the lives of Korean American Buddhists, this review essay addresses how Asian American forms of religion and spirituality are reinterpreted to address the complex renegotiation of identities that take place for recent immigrants. This review essay also examines the process of religious conversion by questioning whether the move from one religious tradition to another can be understood as an additive process rather than a complete transition and addressing the impact of conversion on later generations.     

Gender and relationships: Influences on agentic and communal behaviors

The present research examined the moderating influence of situations involving friends and romantic partners on gender differences in interpersonal behaviors reflecting agency and communion. Behavior was studied in three situations varying in social role and dyadic gender composition: same‐sex friendships, opposite‐sex friendships, and romantic relationships. To obtain multiple events representing each relationship situation, participants recorded information about their interpersonal interactions during a 20‐day period using an event‐contingent recording procedure. Results indicated gender differences consistent with gender stereotypes when men and women were interacting with same‐sex friends; men with men were more dominant and women with women were more agreeable. In interactions with romantic partners, gender differences in communal behavior were opposite to gender stereotypes; women were less agreeable and more quarrelsome than men with their romantic partners. Results are considered in reference to developmental socialization theory, social role theory, and studies of gender differences in marital relationships.     

The Relations of Regulation and Emotionality to Children's Situational Empathy-Related Responding

The relations of dispositional regulation (attentional control, ego control), ego resiliency, and emotionality (general emotional intensity and negative emotionality) to situational measures of sympathy and personal distress were examined. Situational sympathy and personal distress were assessed with facial, self-reported, and heart rate reactions to an empathy-inducing film. Teachers and parents completed measures of children's dispositional regulation and emotionality. In general, children who evidenced sympathy (e.g., facial sadness, mean heart rate decline, and self-reported sympathy) were rated higher in regulation and resiliency, although findings sometimes were obtained for only one sex. Children who evidenced personal distress (e.g., facial distress), as well as facial sadness, were rated relatively high in emotionality. Gaze aversion from the film was correlated with regulation and boys' resiliency, and was negatively related to negative emotionality.     

Value as a Moderator in Subjective Well-Being

We investigated individual differences in the processes of subjective well-being (SWB). There were considerable individual differences in the domain that was most strongly associated with global life satisfaction. Individuals also differed significantly in the types of activities that they found satisfying. Moreover, these individual differences in the patterns of SWB were systematically related to value orientations. A 23-day daily diary study revealed that intraindividual changes in satisfaction were strongly influenced by the degree of success in the domains that individuals value. The present findings highlight the meaningful individual differences in the qualitative aspects of subjective well-being.     

Mask-wearing increases present-mindedness

Besides health consequences, in what subtle ways do mask-wearing affect our psychology? In this research, we explored whether the experience of mask-wearing, like other disruptive visceral states (e.g., hunger), affects our time perspective. In two experiments (total N = 596), we examined if mask-wearing temporarily generates present-mindedness (more focus on present than future). Study 1 found that mask-wearing (vs. no-mask) lowered considerations about the future, which was mediated by a sense of stuffiness. Study 2 extended this finding and examined whether the effect spillovers to other time-relevant judgments, such as ideals about a good life. Again, when experiencing stuffiness because of mask-wearing, people were more likely to favor pleasure in current life than future life meaning. Our finding implies that concrete visceral experience (stuffiness) linked with the pandemic may shape our mind in subtle, unforeseen ways.     

Stability control of grasping objects with different locations of center of mass and rotational inertia

The objective of this study was to observe how the digits of the hand adjust to varying location of the center of mass (CoM) above or below the grasp and rotational inertia (RI) of a handheld object. Such manipulations do not immediately affect the equilibrium equations while stability control is affected. Participants were instructed to hold a handle, instrumented with 5 force-torque transducers and a 3-D rotational tilt sensor, while either the location of the CoM or the RI values were adjusted. On the whole, people use 2 mechanisms to adjust to the changed stability requirements; they increase the grip force and redistribute the total moment between the normal and tangential forces offsetting internal torques. The increase in grip force, an internal force, and offsetting internal torques allows for increases in joint and hand rotational apparent stiffness while not creating external forces-torques that would unbalance the equations of equilibrium.     

Single and Multiple Ability Estimation in the SEM Framework: A Noninformative Bayesian Estimation Approach

Latent variable models with many categorical items and multiple latent constructs result in many dimensions of numerical integration, and the traditional frequentist estimation approach, such as maximum likelihood (ML), tends to fail due to model complexity. In such cases, Bayesian estimation with diffuse priors can be used as a viable alternative to ML estimation. This study compares the performance of Bayesian estimation with ML estimation in estimating single or multiple ability factors across 2 types of measurement models in the structural equation modeling framework: a multidimensional item response theory (MIRT) model and a multiple-indicator multiple-cause (MIMIC) model. A Monte Carlo simulation study demonstrates that Bayesian estimation with diffuse priors, under various conditions, produces results quite comparable with ML estimation in the single- and multilevel MIRT and MIMIC models. Additionally, an empirical example utilizing the Multistate Bar Examination is provided to compare the practical utility of the MIRT and MIMIC models. Structural relationships among the ability factors, covariates, and a binary outcome variable are investigated through the single- and multilevel measurement models. The article concludes with a summary of the relative advantages of Bayesian estimation over ML estimation in MIRT and MIMIC models and suggests strategies for implementing these methods.