A simple 5-DoF MR-compatible motion signal measurement system

The purpose of this study was to develop a simple motion measurement system with magnetic resonance (MR) compatibility and safety. The motion measurement system proposed here can measure 5-DoF motion signals without deteriorating the MR images, and it has no effect on the intense and homogeneous main magnetic field, the temporal-gradient magnetic field (which varies rapidly with time), the transceiver radio frequency (RF) coil, and the RF pulse during MR data acquisition. A three-axis accelerometer and a two-axis gyroscope were used to measure 5-DoF motion signals, and Velcro was used to attach a sensor module to a finger or wrist. To minimize the interference between the MR imaging system and the motion measurement system, nonmagnetic materials were used for all electric circuit components in an MR shield room. To remove the effect of RF pulse, an amplifier, modulation circuit, and power supply were located in a shielded case, which was made of copper and aluminum. The motion signal was modulated to an optic signal using pulse width modulation, and the modulated optic signal was transmitted outside the MR shield room using a high-intensity light-emitting diode and an optic cable. The motion signal was recorded on a PC by demodulating the transmitted optic signal into an electric signal. Various kinematic variables, such as angle, acceleration, velocity, and jerk, can be measured or calculated by using the motion measurement system developed here. This system also enables motion tracking by extracting the position information from the motion signals. It was verified that MR images and motion signals could reliably be measured simultaneously.     

Evidentiality in language and cognition

What is the relation between language and thought? Specifically, how do linguistic and conceptual representations make contact during language learning? This paper addresses these questions by investigating the acquisition of evidentiality (the linguistic encoding of information source) and its relation to children's evidential reasoning. Previous studies have hypothesized that the acquisition of evidentiality is complicated by the subtleness and abstractness of the underlying concepts; other studies have suggested that learning a language which systematically (e.g. grammatically) marks evidential categories might serve as a pacesetter for early reasoning about sources of information. We conducted experimental studies with children learning Korean (a language with evidential morphology) and English (a language without grammaticalized evidentiality) in order to test these hypotheses. Our experiments compared 3- and 4-year-old Korean children's knowledge of the semantics and discourse functions of evidential morphemes to their (non-linguistic) ability to recognize and report different types of evidential sources. They also compared Korean children's source monitoring abilities to the source monitoring abilities of English-speaking children of the same age. We found that Korean-speaking children have considerable success in producing evidential morphology but their comprehension of such morphology is very fragile. Nevertheless, young Korean speakers are able to reason successfully about sources of information in non-linguistic tasks; furthermore, their performance in these tasks is similar to that of English-speaking peers. These results support the conclusion that the acquisition of evidential expressions poses considerable problems for learners; however, these problems are not (necessarily) conceptual in nature. Our data also suggest that, contrary to relativistic expectations, children's ability to reason about sources of information proceeds along similar lines in diverse language-learning populations and is not tied to the acquisition of the linguistic markers of evidentiality in the exposure language. We discuss implications of our findings for the relationship between linguistic and conceptual representations during development.     

Enhanced Hippocampal CA1 LTP but Normal Spatial Learning in Inositol 1,4,5-trisphosphate 3-kinase(A)-Deficient Mice

To define the physiological role of IP₃3-kinase(A) in vivo, we have generated a mouse strain with a null mutation of the IP₃3-kinase(A) locus by gene targeting. Homozygous mutant mice were fully viable, fertile, apparently normal, and did not show any morphological anomaly in brain sections. In the mutant brain, the IP₄ level was significantly decreased whereas the IP₃ level did not change, demonstrating a major role of IP₃3-kinase(A) in the generation of IP₄. Nevertheless, no significant difference was detected in the hippocampal neuronal cells of the wild-type and the mutant mice in the kinetics of Ca²⁺ regulation after glutamate stimulation. Electrophysiological analyses carried out in hippocampal slices showed that the mutation significantly enhanced the LTP in the hippocampal CA1 region, but had no effect on the LTP in dentate gyrus (DG). No difference was noted, however, between the mutant and the wild-type mice in the Morris water maze task. Our results indicate that IP₃3-kinase(A) may play an important role in the regulation of LTP in hippocampal CA1 region through the generation of IP₄, but the enhanced LTP in the hippocampal CA1 does not affect spatial learning and memory.     

Safety first,but for whom? Shifts in risk perception for self and others following COVID-19 vaccination

Vaccines can affect the mind as well as the body. Research on the psychological impact of vaccines has largely focused on risk-related judgments and behaviors involving the recipient. Here, we extend this work to risk-related judgments of others. In a prospective cohort study involving three samples and two timepoints (N = 588 adults), we tested competing hypotheses about the effects of receiving a COVID-19 vaccine on perceived risks to the unvaccinated: (1) a self/other differentiation hypothesis (vaccination will lead to estimation of lower risk for the self but higher risk for others) versus (2) a self/other correspondence hypothesis (vaccination will lead to estimation of lower risk from contracting COVID-19 for both self and others). Results revealed risk estimates as well as preferences for COVID-related social policies more consistent with the former hypothesis. We discuss potential psychological mechanisms and implications of these findings.     

Did COVID-19 really change our well-being? It's up to meaning in life: Evidence from two longitudinal studies

Since the outbreak of COVID-19, copious studies have explored whether and how COVID-19 has changed individuals' well-being. However, research has revealed mixed and inconsistent findings on this topic, with some suggesting that the pandemic hampered well-being, and others showing non-significant or even opposite patterns. Yet, little is known about what psychological factors could explain such discrepancies. The present study aims to fill this gap by proposing meaning in life (MIL) as a key moderator of the changes in well-being following the pandemic. Two studies reported here (total N = 19,828), which took within-person longitudinal approaches comparing subjective well-being (SWB; hedonic well-being) and psychological well-being (PWB; eudaimonic well-being) before and during COVID-19 (Study 1: 2018, 2019 vs. 2020, 2021; Study 2: 2019 vs. 2021), provided empirical evidence supporting our theoretical claims. Specifically, we found significant moderative effects of MIL in both studies, such that individuals who held a higher MIL amidst COVID-19 experienced an increase in SWB as well as PWB. In stark contrast, the two indicators of well-being declined over time among those who possessed a lower MIL during the pandemic. Overall, our results suggest that MIL serves as one of the significant moderators of the changes in well-being following COVID-19, which may address the previous conflicting findings in this field.     

How Do You Assess a Manager’s Decision-Making Abilities? The Use of Situational Inventories

Decision-making capabilities are absolutely crucial to a manager. Unfortunately, existing methods of assessing managers in this area for selection and development purposes (in-tray exercises, situational interviews, ability tests, etc.) leave a lot to be desired. This article focuses on an alternative for assessing managerial decision making – the situational inventory – and presents research findings and information on practical applications. Detailed findings are also presented for ‘Scenarios’, the UK’s first published situational measure of managerial judgement. Situational inventories work by presenting participants with realistic but difficult real-life management scenarios. Each scenario is accompanied by a number of possible responses which participants rate for effectiveness in dealing with the scenario. Participants’ ratings are then scored against a set of ideal answers, producing an assessment of current decision-making ability. Decision-making ability can be developed in individuals, making feedback invaluable to participants. Evidence that has been accumulating in the United States and the UK for at least 15 years is presented to support the general situational inventory approach. Additionally, specific evidence is presented for ‘Scenarios’. It was found to correlate significantly with a number of managerial performance and responsibility indicators while appearing to be largely separate from existing psychometric (ability and personality) tests.     

Stepwise contouring of efficient criterion vectors for large-scale MOLP

In this paper a new method of presenting the overall (focused) structure of the efficient criterion vectors (N) for large-scale MOLP is proposed. The proposed algorithm ASEOV (approximation of the set of efficient objective vectors) determines the representative subset of N and ensures full coverage of N , with corresponding coverage precision indicated. ASEOV works in objective space directly and eliminates unnecessary computational effort at the collapsing extreme points of X , which are transformed to non-extreme points in objective space. The Tchebycheff metric is employed to measure the coverage precision. ASEOV allows a decision maker (DM) to control the determination procedure by assessing the coverage allowance for each criterion. When the DM's preference is available, ASEOV can focus contouring on the subset of N which fits with the extracted preference. Combined with proper interactive methods, this focused contour over N can reduce the DM's burden, inconsistency or cognitive bias in assessing his preference from which to derive the final best-compromise solution. An illustrative example is presented.