Some scholars have treated overconfidence as an individual difference—that is, assuming the tendency to be overconfident is stable within a person and differs meaningfully from person to person. We question this assumption. We investigate consistency within individuals between its three forms—overestimation, overplacement, and overprecision—in multiple domains (Study 1a and 1b), at multiple times (Study 1b and 2), and with multiple measures (Study 3a and 3b). We find mixed evidence of trait-like consistency. We do find some evidence of within-individual stability across domains and time points. However, we find little consistency across different measures of the same form of overconfidence—specifically overprecision. Instead, we find more consistent evidence that overconfidence varies situationally and contextually.

This study aimed to establish normal reference ranges of combined cardiac output (CCO) and umbilical venous flow volume (UVFV) in twin fetuses at 20 to 28 weeks of gestation and to evaluate the differences between monochorionic and dichorionic twins. CCO and UVFV were prospectively measured by ultrasound at two centers. The following exclusion criteria were applied: age <18 years or >45 years, first hospital visit at >16 weeks of gestation, monochorionic monoamniotic twin pregnancy, fetal structural or chromosomal abnormality, fetal growth restriction, twin-twin transfusion syndrome, twin anemia polycythemia sequence, and severe hypertension or renal disease were excluded. The period was divided into three groups: 20–22 weeks of gestation, 23–25 weeks of gestation, and 26–28 weeks of gestation. The CCO and UVFV were measured at least once during each period. CCO and UVFV were collected from 274 and 269 fetuses and were measured 412 and 424 times, respectively. UVFV and CCO levels increased as gestation progressed. The weight-corrected UVFV (UVFV/kg) and CCO (CCO/kg) remained stable. UVFV and CCO did not differ between monochorionic and dichorionic twin fetuses. The mean ± SD of UVFV/kg and CCO/kg were determined as 127.8 ± 31.8 and 439.4 ± 80.1 mL/kg/min, respectively. The UVFV-to-CCO ratio also remained stable from 20 to 28 weeks of gestation, ranging from 27.7% to 31.8%. The values and ranges of UVFV/kg and mean CCO/kg in twins were similar to those in singletons.

A simple probabilistic argument shows that every r-uniform hypergraph with m edges contains an r-partite subhypergraph with at least $({r!}/{r^r})m$ edges. The celebrated result of Edwards states that in the case of graphs, that is $r=2$, the resulting bound $m/2$ can be improved to $m/2+\Omega(m^{1/2})$, and this is sharp. We prove that if $r\geq 3$, then there is an r-partite subhypergraph with at least $({r!}/{r^r}) m+m^{3/5-o(1)}$ edges. Moreover, if the hypergraph is linear, this can be improved to $({r!}/{r^r}) m+m^{3/4-o(1)}$, which is tight up to the o(1) term. These improve results of Conlon, Fox, Kwan and Sudakov. Our proof is based on a combination of probabilistic, combinatorial, and linear algebraic techniques, and semidefinite programming.

A key part of our argument is relating the energy $\mathcal{E}(G)$ of a graph G (i.e. the sum of absolute values of eigenvalues of the adjacency matrix) to its maximum cut. We prove that every m edge multigraph G has a cut of size at least $m/2+\Omega({\mathcal{E}(G)}/{\log m})$, which might be of independent interest.

Hypertensive disorders of pregnancy (HDP) and postpartum depression (PPD) are significant global health challenges affecting maternal and child well-being. HDP, including pre-eclampsia, gestational hypertension, and chronic hypertension, complicate up to 10% of pregnancies worldwide, with profound implications for maternal mortality, particularly in low- to middle-income countries (LMICs) like Ghana. The incidence of HDP is rising globally, contributing substantially to maternal deaths and severe perinatal outcomes such as stillbirth and low birth weight. Concurrently, perinatal mental health issues, including PPD, affect a significant proportion of women globally, with higher prevalence rates observed in LMICs. Despite the known physiological impacts of HDP, their association with maternal mental health remains underexplored, especially in LMIC contexts. A systematic review and meta-analysis were conducted to explore the association between HDP and PPD in LMICs, focusing on available literature and studies from diverse global settings. Additionally, semi-structured qualitative interviews were conducted with healthcare professionals in Ghana to gather insights into local perspectives and experiences regarding this association. The systematic review revealed a consistent association between HDP and increased risk of PPD across various LMIC settings. Meta-analysis findings indicated a significant pooled odds ratio, highlighting a robust statistical linkage between HDP severity and subsequent PPD risk. Qualitative data underscored healthcare professionals’ observations of heightened psychological distress among women with HDP, emphasizing the complex interplay between physiological complications and maternal mental health outcomes in the Ghanaian context. The study findings underscore the critical need for integrated maternal health strategies that address both physical and psychological aspects of pregnancy complications like HDP. By elucidating these connections, the study contributes to advancing evidence-based interventions and support systems tailored to LMIC settings, aiming to mitigate adverse maternal mental health outcomes and improve overall perinatal care in Ghana and similar contexts worldwide. These insights are pivotal for informing policy decisions, guiding healthcare practices, and fostering targeted interventions that enhance maternal well-being during the vulnerable perinatal period.

Despite being the most prevalent personality disorder, borderline personality disorder remains a diagnosis with many unanswered questions, particularly concerning pharmacological management. Although many clinical practice guidelines suggest not prescribing medication unless there are significant clinical comorbidities, it is one of the psychiatric diagnoses with the highest rates of polypharmacy. This commentary on a BJPsych Advances article aims to raise clinical questions regarding the voids of knowledge and the appropriateness of medicating and, perhaps, overmedicating in this particular group.

Sesquizygotic twinning (SZT) is one of the rarest events that can occur in multiple pregnancies. It has only been reported twice to date. Studies indicate that sesquizygotic twins result from the splitting of a chimeric embryo at an early stage. Theories and studies suggest that SZT represents a third unique twinning mechanism that is different from dizygotic and monozygotic twinning; however, the unique features of SZT have nothing to do with the twinning mechanism. Instead, it resembles more of an atypical monozygotic twinning form according to the twinning mechanism.

Orbit separation dimension ($\mathrm {OSD}$), previously introduced as amorphic complexity, is a powerful complexity measure for topological dynamical systems with pure-point spectrum. Here, we develop methods and tools for it that allow a systematic application to translation dynamical systems of tiling spaces that are generated by primitive inflation rules. These systems share many nice properties that permit the explicit computation of the $\mathrm {OSD}$, thus providing a rich class of examples with non-trivial $\mathrm {OSD}$.

Although adverse childhood experiences (ACEs) are commonly associated with depressive symptoms in adulthood, studies frequently collapse ACEs into a single unitary index, making it difficult to identify specific targets for intervention and prevention. Furthermore, studies rarely explore sex differences in this area despite males and females often differing in the experiences of ACEs, depressive symptoms, and inflammatory activity. To address these issues, we used data from the National Longitudinal Study of Adolescent to Adult Health to model the effects of 10 different ACEs on C-reactive protein (CRP) and depressive symptoms in adulthood. Path modeling was used to measure the effects of ACEs on CRP and depressive symptoms conjointly while also assigning covariances among ACEs to assess their interrelations. Sex-by-ACE interaction terms and sex-disaggregated models were used to test for potential differences. Emotional abuse and parental incarceration were consistently related to both CRP and depressive symptoms for males and females. Childhood maltreatment was associated with depressive symptoms for females, whereas sexual abuse was associated with inflammation for males. Several covariances among ACEs were identified, indicating potential networks through which ACEs are indirectly associated with CRP and depressive symptoms. These data demonstrate that ACEs have differing direct effects on CRP and depressive symptoms – and that they differ with respect to how they cluster – for males versus females. These differences should be considered in theory and clinical workflows aiming to understand, treat, and prevent the long-term impacts of ACEs on depressive symptoms and inflammation-related health conditions in adulthood.

This research essay explores how US dollar centrality and strength may impede decarbonization. First, I suggest that because US dollar centrality enables higher US household consumption and imports, and US household consumption is comparatively carbon-intensive, centrality can increase per capita emissions and carbon-intensive consumption in the United States. Second, I explore how US dollar strength can compromise the monetary autonomy and capacity to finance decarbonization for dollar-exposed emerging market economies. They are negatively impacted most notably in the areas of trade, external debt, and investment. Finally, US dollar strength also has the potential to limit the competitiveness of US green manufacturing and exports. US currency overvaluation means that green technologies produced in the United States can be comparatively expensive in global markets. I conclude with a discussion of future research and policy implications.

Equity has traditionally been understood as a judicial corrective to the generality of statutory law caused by the limited foresight of legislatures. Because of the ad hoc and corrective character of equity, many scholars have seen a tension between the morality of equity and the positivity of law. Equity, John Gardner once suggested, is “justice’s rebellion against law”—insofar as the positive law does not usually authorise the exercise of equity by judges. In this article, I argue that while the exercise of equity requires the exercise of an equitable power, there are good reasons for the law to allow this power. I do so while showing the conditions under which the positive law could implement the two main historical ways of exercising equity in adjudication: ‘equitable interpretation’ and ‘equitable suspension’ of the law. In defending this argument, I also offer a brief historical sketch of equity and its connection with the modern approach to the study of implicit exceptions in the law: legal defeasibility.

Code-blending is the simultaneous expression of utterances using both a sign language and a spoken language. We expect that like code-switching, code-blending is linguistically constrained and thus we investigate two hypothesized constraints using an acceptability judgment task. Participants rated the acceptability of code-blended utterances designed to be consistent or inconsistent with these hypothesized constraints. We find strong support for the proposed constraint that each modality of code-blended utterances contributes content to a single proposition. We also find support for the proposed constraint that – at least for American Sign Language (ASL) and English – code-blended utterances make use of a single derivation which is realized using surface forms in the two languages, rather than two simultaneous derivations, one for each language. While this study was limited to ASL/English code-blending and further investigation is needed, we hope that this novel study will encourage future research comparing linguistic constraints on code-blending and code-switching.