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Over the past two decades, many studies have examined the relationship between perfectionism and academic achievement. However, these studies have yet to be systematically collated and meta-analysed. The purpose of the present study was to do so. A literature search returned 37 studies (N=8901) and 156 effect sizes. Random-effects meta-analyses indicated that perfectionistic strivings showed a significant small to medium positive relationship with academic achievement (r⁺ = .24), whereas perfectionistic concerns showed a significant small negative relationship with academic achievement (r⁺ =-.08). One moderator of these relationships was the instrument that was used to measure perfectionism. This was particularly the case for perfectionistic concerns. The findings suggest that the relationship between perfectionism and academic achievement is complex with perfectionistic strivings potentially aiding and perfectionistic concerns potentially hindering students' academic achievement.

Danièle Huillet and Jean-Marie Straub collaborated on films together from the mid-1960s through the mid-2000s, making formally radical adaptations in several languages of major works of European literature by authors including Franz Kafka, Bertolt Brecht, Friedrich Hölderlin, Pierre Corneille, Arnold Schoenberg, Cesare Pavese, and Elio Vitorrini. The impact of their work comes in part from a search for radical objectivity, a theme present in certain underground currents of modernist art and theory in the writings of Benjamin and Adorno and in a long-forgotten movement of American modernist poetry, Objectivism, whose members included Louis Zukofsky, George Oppen, and Charles Reznikoff, with connections to William Carlos Williams and Ezra Pound. Through a detailed analysis of the films of Straub and Huillet, the works they adapted, and Objectivist poems and essays, Benoît Turquety locates common practices and explores a singular aesthetic approach where a work of art is conceived as an object, the artist an anonymous artisan, and where the force of politics and formal research attempt to reconcile with one another.

Interest in the link between Autism Spectrum Disorder (ASD) and Anorexia Nervosa (AN) has led to estimates of the prevalence of autistic traits in AN. This systematic review and meta-analysis assessed the use of the Autism-Spectrum Quotient (AQ) or abbreviated version (AQ-10) to examine whether patients with AN have elevated levels of autistic traits. Seven studies were identified and subsequent meta-analysis indicated that those with AN appear to have significant difficulties of a manner characteristic of ASD, relative to controls. Whilst this analysis supports previous indications of higher prevalence of ASD in AN, the aetiology of these traits remains unclear. Studies using more robust clinical measures of ASD within AN are needed to confirm what self-report measures appear to show.

We discuss the factors that encouraged us to examine the question of whether exercise training has a positive influence on cognitive health of older adults in 2003. At that time there was a substantial literature on exercise and cognition. However, cognitive assessment instruments, exercise protocols (including type of exercise, length, and intensity of exercise programs), and subject-selection criteria differed widely. Our meta-analysis enabled us to examine both the main question under study—exercise effects on cognition—and potential moderators of this effect. Several interesting findings, which are briefly detailed in the present article, were revealed by our analyses. The current article also examines where the literature has gone since our 2003 article.

Within populations, individuals can vary in stress response, a multivariate phenomenon comprising neuroendocrine, physiological and behavioural traits. Verbal models of individual stress “coping style” have proposed that the behavioural component of this variation can be described as a single axis, with each individual's coping style being consistent across time and stress contexts. Focusing on this behavioural component of stress response and combining repeated measures of multiple traits with a novel multivariate modelling framework, we test for the existence of coping style variation and assess its stability across contexts in the Trinidadian guppy (Poecilia reticulata). Specifically, we test the following hypotheses: (1) there exists repeatable among‐individual behavioural (co)variation (“personality”) within a mild stress context consistent with a risk‐averse–risk‐prone continuum of behavioural coping style, (2) there is population‐level plasticity in behaviour as a function of stressor severity, (3) there is among‐individual variation in plasticity (i.e. IxE), and (4) the presence of IxE reduces cross‐context stability of behavioural coping style. We found significant repeatable among‐individual behavioural (co)variation in the mild stress context (open field trial), represented as an I matrix. However, I was not readily described by a simple risk‐averse–risk‐prone continuum as posited by the original coping style model. We also found strong evidence for population‐level changes in mean behaviour with increasing stressor severity (simulated avian and piscine predation risks). Single‐trait analyses did show the presence of individual‐by‐environment interactions (IxE), as among‐individual cross‐context correlations were significantly less than +1. However, multitrait analysis revealed the consequences of this plasticity variation were minimal. Specifically, we found little evidence for changes in the structure of I between mild and moderate stress contexts overall, and only minor changes between the two moderate contexts (avian vs. piscine predator). We show that a multivariate approach to assessing changes in among‐individual (co)variance across contexts can prevent the over‐interpretation of statistically significant, but small, individual‐by‐environment effects. While behavioural flexibility enables populations (and individuals) to respond rapidly to changes in the environment, multivariate personality structure can be conserved strongly across such contexts. A plain language summary is available for this article. Plain Language Summary

We used a data set with n = 1,603 learners of foreign languages (FL) to develop and validate the short form of the Foreign Language Enjoyment Scale (S-FLES). The data was split into 2 groups, and we used the first sample to develop the short-form measure. A 3-factor hierarchical model of foreign language enjoyment (FLE) was uncovered, with FLE as a higher-order factor and with teacher appreciation, personal enjoyment, and social enjoyment as 3 lower-order factors. We selected 3 items for each of the 3 lower-order factors of the S-FLES. The proposed 9-item S-FLES was validated in the second sample, and the fit statistics for the factor structure indicated close fit. Further evidence was found to support the internal consistency, convergent validity, and discriminant validity of the S-FLES. The S-FLES provides a valid and reliable short-form measure of FLE, which can easily be included in any battery of assessments examining individual differences in FL learning.

Resource availability and habitat heterogeneity are principle drivers of biodiversity, but their individual roles often remain unclear since both factors are usually correlated. The biodiversity of species dependent on dead wood could be driven by either resource availability represented by dead‐wood amount or habitat heterogeneity characterized by dead‐wood diversity or both. Understanding their roles is crucial for improving evidence‐based conservation strategies for saproxylic species in managed forests. To disentangle the effects of dead‐wood amount and dead‐wood diversity on biodiversity relative to canopy openness (microclimate), we experimentally exposed different amounts of logs and branches of two different tree species representing a gradient of dead‐wood diversity in 190 sunny and shady forest plots. During the 3 years after exposing dead wood, we sampled saproxylic beetles, which are together with fungi the most diverse and important taxonomic group involved in decomposition of wood. The composition of saproxylic beetle assemblages differed clearly between shady and sunny forest plots, with higher richness in sunny plots. Both dead‐wood amount and dead‐wood diversity positively and independently affected species richness of saproxylic beetles, but these effects were mediated by canopy openness. In sunny forest, species richness increased with increasing amount of dead wood, whereas in shady forest, dead‐wood diversity was the prevailing factor. The stepwise analysis of abundance and species richness, however, indicated that effects of both factors supported only the habitat‐heterogeneity hypothesis, as the positive effect of high amounts of dead wood could be explained by cryptic variability of dead‐wood quality within single objects. Synthesis and applications. As canopy openness and habitat heterogeneity seem to be the major drivers of saproxylic beetle diversity in temperate forests, we recommend that managers aim to increase the heterogeneity of dead‐wood substrates under both sunny and shady forest conditions. Intentional opening of the canopy should be considered in anthropogenically homogenized, dense forests. Specifically in temperate mixed montane forests, dead wood should be provided in the form of large logs in sunny habitats and a high diversity of different dead‐wood substrates should be retained or created in shady forests.

The \"variance hypothesis\" predicts that external search breadth leads to innovation outcomes, but people have limited attention for search and cultivating breadth consumes attention. How does individuals' search breadth affect innovation outcomes? How does individuals' allocation of attention affect the efficacy of search breadth? We matched survey data with complete patent records, to examine the search behaviors of elite boundary spanners at IBM. Surprisingly, individuals who allocated attention to people inside the firm were more innovative. Individuals with high external search breadth were more innovative only when they allocated more attention to those sources. Our research identifies limits to the \"variance hypothesis\" and reveals two successful approaches to innovation search: \"cosmopolitans\" who cultivate and attend to external people and \"locals\" who draw upon internal people.

This study explored developmental and individual differences in intellectual humility (IH) among 127 children ages 6-8. IH was operationalized as children's assessment of their knowledge and willingness to delegate scientific questions to experts. Children completed measures of IH, theory of mind, motivational framework, and intelligence, and neurophysiological measures indexing early (error-related negativity [ERN]) and later (error positivity [Pe]) error-monitoring processes related to cognitive control. Children's knowledge self-assessment correlated with question delegation, and older children showed greater IH than younger children. Greater IH was associated with higher intelligence but not with social cognition or motivational framework. ERN related to self-assessment, whereas Pe related to question delegation. Thus, children show separable epistemic and social components of IH that may differentially contribute to metacognition and learning.

Individuals must often choose among discrete actions with imperfect information about their payoffs. Before choosing, they have an opportunity to study the payoffs, but doing so is costly. This creates new choices such as the number of and types of questions to ask. We model these situations using the rational inattention approach to information frictions. We find that the decision maker's optimal strategy results in choosing probabilistically in line with a generalized multinomial logit model, which depends both on the actions' true payoffs as well as on prior beliefs.