Ivan Ropovik

Charles University in Prague | CUNI · Institute for Research and Development of Education

The article tackles the practice of testing latent variable models. The analysis covered recently published studies from 11 psychology journals varying in orientation and impact. Seventy-five studies that matched the criterion of applying some of the latent modeling techniques were reviewed. Results indicate the presence of a general tendency to ig...

Because negative findings have less chance of getting published, available studies tend to be a biased sample. This leads to an inflation of effect size estimates to an unknown degree. To see how meta-analyses in education account for publication bias, we surveyed all meta-analyses published in the last five years in the Review of Educational Resea...

This large-scale meta-analysis aimed to provide the most comprehensive synthesis to date of the available evidence from the pre-COVID period on risk and protective factors for (internet) gaming disorder (as defined in the DSM-5 or ICD-11) across all studied populations. The risk/protective factors included demographic characteristics, psychological...

Mindfulness witnessed a substantial popularity surge in the past decade, especially as digitally self-administered interventions became available at relatively low costs. Yet, it is uncertain whether they effectively help reduce stress. In a preregistered (OSF https://doi.org/10.17605/OSF.IO/UF4JZ; retrospective registration at ClinicalTrials.gov N...

Ideal partner preferences (i.e., ratings of the desirability of attributes like attractiveness or intelligence) are the source of numerous foundational findings in the interdisciplinary literature on human mating. Recently, research on the predictive validity of ideal partner preference matching (i.e., Do people positively evaluate partners who mat...

Though people usually imagine the typical person as a man rather than a woman, the effect is mixed for racial groups and understudied among traditionally male social groups (e.g., police and criminals) and non-U.S. populations. Results from a survey (N > 5000) collected via a globally distributed laboratory network in over 40 regions demonstrated t...

School readiness is foundational for children's later achievement. Despite a surge in studies examining the relationship between parental involvement and school readiness in recent decades, to the best of our knowledge, no systematic reviews have comprehensively addressed this link. This meta-analysis mapped the evidence on the relationship between...

Although mental disorders are long considered complex dynamic systems, our understanding of the mutual interactions and temporal patterns of their symptoms remains limited. In this longitudinal study, we examined the structure and dynamics of four key mental health indicators—depression, anxiety, PTSD, and insomnia—in a representative sample of the...

Ideal partner preferences(i.e., ratings of the desirability of attributes like attractiveness or intelligence)are the source of numerous foundational findings in the interdisciplinary literature on human mating. Recently, research on the predictive validity of ideal partner preference-matching (i.e., do people positively evaluate partners who match...

Terror Management Theory (TMT) proposes that when people are made aware of their own death, they are more likely to endorse cultural values. TMT is a staple of social psychology, being featured prominently in textbooks and the subject of much research. The implications associated with TMT are significant, as its advocates claim it can partially exp...

Objectives There are dozens of screening instruments purporting to measure the (Internet) gaming disorder (IGD/GD). The two prominent diagnostic manuals, DSM‐5 and ICD‐11, list several additional diagnostic or clinical features and problems (e.g., neglect of sleep, neglect of daily duties, health deterioration) that should co‐occur or be caused by...

Loneliness has been associated with a number of detrimental effects for individuals and societies, making it a priority for monitoring across the European Union. While many loneliness measures currently exist, notable gaps exist regarding knowledge of their psychometric structure, reliability, comparability, and validity, particularly as it pertain...

Objective: From 2022, the International Classification of Diseases, eleventh edition (ICD-11) includes the first mental disorder based on digital technology, “gaming disorder,” which was previously suggested as a condition for further examination in the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-5). In this cross-sect...

Video games are increasingly portraying many topics that we face in our everyday lives. Yet we have only limited evidence about the way narrative games affect how we think about the topics they depict; in other words, about the link between these games and attitude change. Therefore, we conducted a meta-analysis of video games’ effect on attitudina...

Empirical studies on gaming disorder (GD) predominantly employ cross-sectional designs, offering limited insights into the development of GD. The existing longitudinal studies on the risk factors of GD often yield contradictory results and typically rely solely on baseline data to predict future states. The present study was specifically designed t...

In this meta-analysis, the authors investigated whether being in nature and emotional social support are reliable strategies to downregulate stress. We retrieved all the relevant articles that investigated a connection between one of these two strategies and stress. For being in nature we found 54 effects reported in 16 papers (total N = 1,697, Mdn...

Mental simulation theories of language comprehension propose that people automatically create mental representations of objects mentioned in sentences. Mental representation is often measured with the sentence-picture verification task, wherein participants first read a sentence that implies the object property (i.e., shape and orientation). Partic...

This large, international dataset contains survey responses from N = 12,570 students from 100 universities in 35 countries, collected in 21 languages. We measured anxieties (statistics, mathematics, test, trait, social interaction, performance, creativity, intolerance of uncertainty, and fear of negative evaluation), self-efficacy, persistence, and...

Motivation and self-concept count among the educationally most relevant factors and the evaluation of many educational interventions requires their valid measurement. The present study examined the psychometric properties of a shortened version of the Students' Approaches to Learning questionnaire measuring 10 distinct motivational and self-concept...

Over the past decade, self-administered mindfulness interventions, such as those administered via phone apps, have become increasingly popular. However, their effectiveness for regulating stress is unclear. In a multi-site study (Nsites = 37, Nparticipants = 2,239; all fluent English speakers) we experimentally investigated the efficacy of four sin...

In response to the COVID-19 pandemic, the Psychological Science Accelerator coordinated three large-scale psychological studies to examine the effects of loss-gain framing, cognitive reappraisals, and autonomy framing manipulations on behavioral intentions and affective measures. The data collected (April to October 2020) included specific measures...

How well can social scientists predict societal change, and what processes underlie their predictions? To answer these questions, we ran two forecasting tournaments testing the accuracy of predictions of societal change in domains commonly studied in the social sciences: ideological preferences, political polarization, life satisfaction, sentiment...

How well can social scientists predict societal change, and what processes underlie their predictions? To answer these questions, we ran two forecasting tournaments testing the accuracy of predictions of societal change in domains commonly studied in the social sciences: ideological preferences, political polarization, life satisfaction, sentiment...

Ideal partner preferences (i.e., ratings of the desirability of attributes like attractiveness or intelligence) are the source of numerous foundational findings in the interdisciplinary literature on human mating. Recently, research on the predictive validity of ideal partner preference-matching (i.e., do people positively evaluate partners who mat...

Voluntary isolation is one of the most effective methods for individuals to help prevent the transmission of diseases such as COVID-19. Understanding why people leave their homes when advised not to do so and identifying what contextual factors predict this non-compliant behavior is essential for policymakers and public health officials. To provide...

This large, international dataset contains survey responses from N = 12,570 students from 100 universities in 35 countries, collected in 21 languages. We measured anxieties (statistics, mathematics, test, trait, social interaction, performance, creativity, intolerance of uncertainty, and fear of negative evaluation), self-efficacy, persistence, and...

How well can social scientists predict societal change, and what processes underlie their predictions? To answer these questions, we ran two forecasting tournaments testing accuracy of predictions of societal change in domains commonly studied in the social sciences: ideological preferences, political polarization, life satisfaction, sentiment on s...

The COVID-19 pandemic (and its aftermath) highlights a critical need to communicate health information effectively to the global public. Given that subtle differences in information framing can have meaningful effects on behavior, behavioral science research highlights a pressing question: Is it more effective to frame COVID-19 health messages in t...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

The changes in people’s mental health have become one of the hot topics during the COVID-19 pandemic. Parents have been said to be among the most vulnerable groups in terms of the imposed anti-pandemic measures. The present paper analyzes the trends in mental health indicators in a sample of Slovak parents (N = 363) who participated in four waves o...

This initiative examined systematically the extent to which a large set of archival research findings generalizes across contexts. We repeated the key analyses for 29 original strategic management effects in the same context (direct reproduction) as well as in 52 novel time periods and geographies; 45% of the reproductions returned results matching...

Economic situation is considered to have an effect on economic decision-making, with poor people having more myopic preferences. However, this relationship might not be that straightforward as economic decision-making should also be determined by financial literacy. A pre-registered cross-validation procedure was used to test a structural model out...

Significance Communicating in ways that motivate engagement in social distancing remains a critical global public health priority during the COVID-19 pandemic. This study tested motivational qualities of messages about social distancing (those that promoted choice and agency vs. those that were forceful and shaming) in 25,718 people in 89 countries...

Finding communication strategies that effectively motivate social distancing continues to be a global public health priority during the COVID-19 pandemic. This crosscountry , preregistered experiment (n = 25,718 from 89 countries) tested hypotheses concerning generalizable positive and negative outcomes of social distancing messages that promoted p...

Výskumný projekt Národného programu prevencia a eliminácia rodovej diskriminácie na Inštitúte pre výskum práce a rodiny sa zameral na skúsenosti študentov a študentiek denného štúdia verejných vysokých škôl so sexuálnym obťažovaním. Kvantitatívny výskum mapoval skúsenosti s rôznymi prejavmi obťažujúceho správania, ako aj reakcie študentov a študent...

Studying changes in people’s mental health has become one of the hot topics during the current COVID-19 pandemic. Parents were said to be among the most vulnerable groups, considering the nature of the imposed anti-pandemic measures. The present paper analyzes trends in mental health indicators in a sample of Slovak parents (N = 363) who participat...

Background: From 2022, the ICD-11 includes the first mental disorder based on digital technology, “gaming disorder”, which was previously suggested as a condition for further study in the DSM-5 (2013). In this study, we provide the first large-scale network analysis of various symptom structures for these constructs to understand the complex interc...

Background: This large-scale meta-analysis aimed to provide the most comprehensive synthesis to date of the available evidence on risk and protective factors for (internet) gaming disorder (as defined in the DSM-5 or ICD-11) across all studied populations.Methods: The risk/protective factors included demographic characteristics, psychological, psyc...

Despite extensive research on attitudes and a rapid growth of the video game market, there is currently no meta-analysis mapping the link between narrative video games and attitude change. Here, we present such meta-analysis. The findings suggest that narrative video games affect players’ attitudes towards the topics depicted in games. This effect...

Správa z výskumu – Sexuálne obťažovanie na vysokých školách predstavuje výsledky reprezentatívneho celoslovenského kvantitatívneho prieskumu sexuálneho obťažovania medzi študentkami a študentmi denného štúdia na Slovensku. Výsledky výskumu poukazujú nie len na mieru prevalencie obťažovania, ale poskytujú aj informácie o tom, komu sa študentky a štu...

Robust scientific knowledge is contingent upon replication of original findings. However, replicating researchers are constrained by resources, and will almost always have to choose one replication effort to focus on from a set of potential candidates. To select a candidate efficiently in these cases, we need methods for deciding which out of all c...

This meta-analysis explored whether being in nature and emotional social support are effective in reducing levels of stress through a Registered Report. We retrieved all the relevant articles that investigated a connection between one of these two strategies and various components of stress (physiological, affective and cognitive) as well as affect...

We conducted a pre-registered meta-analysis to appraise available evidence on two stress regulation strategies: Self-administered mindfulness meditation and heart rate variability biofeedback. We used a combination of keywords to find as many experimental and observational studies as possible, all of which highlighted a link between the two strateg...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

In this crowdsourced initiative, independent analysts used the same dataset to test two hypotheses regarding the effects of scientists' gender and professional status on verbosity during group meetings. Not only the analytic approach but also the operationalizations of key variables were left unconstrained and up to individual analysts. For instanc...

Effectively motivating social distancing—keeping a physical distance from others —has become a global public health priority during the COVID-19 pandemic. This cross-country preregistered experiment (n=25,718 in 89 countries) tested hypotheses derived from self-determination theory concerning generalizable positive and negative outcomes of differen...

Rejoinder to Lee, S., & Schwarz, N. (2021). Grounded procedures in mind and society. Behavioral and Brain Sciences, 44(E29). doi:10.1017/S0140525X20000643

Psychické poruchy bývajú konceptualizované ako skrytá kauzálna príčina, ktorá sa prejavuje symptómami. Táto predstava je založená na reflektívnom latentnom modeli, ktorý sa implicitne uplatňuje vždy, keď je komplexná symptomatológia sumarizovaná vo forme čísla alebo kategorického stavu. V článku sú analyzované kvantitatívne, testovateľné implikácie...

How can we maximize what is learned from a replication study? In the creative destruction approach to replication, the original hypothesis is compared not only to the null hypothesis, but also to predictions derived from multiple alternative theoretical accounts of the phenomenon. To this end, new populations and measures are included in the design...

How can we maximize what is learned from a replication study? In the creative destruction approach to replication, the original hypothesis is compared not only to the null hypothesis, but also to predictions derived from multiple alternative theoretical accounts of the phenomenon. To this end, new populations and measures are included in the design...

How can we maximize what is learned from a replication study? In the creative destruction approach to replication, the original hypothesis is compared not only to the null hypothesis, but also to predictions derived from multiple alternative theoretical accounts of the phenomenon. To this end, new populations and measures are included in the design...

One key motivating force for bonding across animals is their need to regulate body temperature, also called social thermoregulation. This phenomenon has been extensively documented in animals, but only recently its existence has been suggested in humans. Psychology, however, has been faced with conflicting findings and the social thermoregulation l...

The pattern of data underlying the successful replications of cleansing effects is improbable and most consistent with selective reporting. Moreover, the meta-analytic approach presented by Lee and Schwarz is likely to find an effect even if none existed. Absent more robust evidence, there is no need to develop a theoretical account of grounded pro...

Over the past 10 years, Oosterhof and Todorov’s valence–dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgements of faces. Because this model has primarily been developed and tested in Western regions, it is unclear w...

Replication studies in psychological science sometimes fail to reproduce prior findings. If these studies use methods that are unfaithful to the original study or ineffective in eliciting the phenomenon of interest, then a failure to replicate may be a failure of the protocol rather than a challenge to the original finding. Formal pre-data-collecti...

Drawing on the concept of a gale of creative destruction in a capitalistic economy, we argue that initiatives to assess the robustness of findings in the organizational literature should aim to simultaneously test competing ideas operating in the same theoretical space. In other words, replication efforts should seek not just to support or question...

In a test of their global-/local-processing-style model, Förster, Liberman, and Kuschel (2008) found that people assimilate a primed concept (e.g., “aggressive”) into their social judgments after a global prime (e.g., they rate a person as being more aggressive than do people in a no-prime condition) but contrast their judgment away from the primed...

Replications in psychological science sometimes fail to reproduce prior findings. If replications use methods that are unfaithful to the original study or ineffective in eliciting the phenomenon of interest, then a failure to replicate may be a failure of the protocol rather than a challenge to the original finding. Formal pre-data collection peer...

Robust scientific knowledge is contingent upon replication of original findings. However, researchers who conduct replication studies face a difficult problem; there are many more studies in need of replication than there are funds available for replicating. To select studies for replication efficiently, we need to understand which studies are the...

The pattern of data underlying the successful replications of cleansing effects is improbable and most consistent with selective reporting. Moreover, the meta-analytic approach presented by Lee and Schwarz is likely to find an effect even if none existed. Absent more robust evidence, there is no need to develop a theoretical account of grounded pro...

Aktuálne diskutovaná problematika slabej replikovateľnosti výskumu má niekoľko príčin. Jednou z najzásadnejších je vysoká prevalencia takzvaných problematických výskumných praktík. Problematické výskumné praktiky sú súborom postupov a skreslení, ktoré zvyšujú výskyt falošne pozitívnych výsledkov v literatúre (prevažne týkajúcej sa behaviorálnych vi...

We propose the first Registered Report examining social co-thermoregulation in humans, a widely studied phenomenon in ecology whereby animals help regulate body heat through conspecifics (for example, by huddling). Participants’ peripheral body temperature will be measured continuously while they view photos of their romantic partner, or strangers,...

Psychické poruchy bývajú konceptualizované ako skrytý kauzálny faktor, ktorý sa prejavuje symptómami. Táto predstava je založená na reflektívnom latentnom modeli, ktorý sa uplatňuje vždy, keď je komplexná symptomatológia sumarizovaná vo forme čísla alebo kategorického stavu. V článku sú analyzované kvantitatívne, testovateľné implikácie tohto psych...

Psychologický výskum sa aktuálne nachádza v stave krízy, ktorá sa označuje ako kríza straty dôvery vo vedecké poznanie alebo replikačná kríza. Aj napriek tomu, že tieto označenia upozorňujú na podstatné problémy, podľa niektorých autorov sa na súčasnú situáciu dá nazerať aj ako na renesanciu psychologického výskumu, alebo dokonca revolúciu. Cieľom...

The laser radiation absorbed by cells induces production of reactive oxygen species (ROS), followed by the development of oxidative stress. Proteins are major targets for ROS due to their abundance in biological systems. The aim of the present pilot study was to examine the effects of transcutaneous laser blood irradiation (TLBI), i.e., low-level l...

Motivation and self-concept count among the educationally most relevant factors and the evaluation of many educational interventions requires their valid measurement. The present large-scale nationally representative study aimed to examine the psychometric properties of a shortened version of the Students’ Approaches to Learning questionnaire measu...

Because negative findings have less chance of getting published, available studies tend to be a biased sample. This leads to a higher prevalence of false positives and the inflation of effect sizes to an unknown degree. To see how meta-analyses in education account for publication bias, we surveyed all meta-analyses published in the last three year...

Over the last ten years, Oosterhof and Todorov’s valence-dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgments of faces. Because this model has primarily been developed and tested in Western regions, it is unclear w...

Replications in psychological science sometimes fail to reproduce prior findings. If replications use methods that are unfaithful to the original study or ineffective in eliciting the phenomenon of interest, then a failure to replicate may be a failure of the protocol rather than a challenge to the original finding. Formal pre-data collection peer...

Recent in vitro studies have shown that vitamin C (Vit C) with pro-oxidative properties causes cytotoxicity of breast cancer cells by selective oxidative stress. However, the effect of Vit C in itself at different concentration levels on MCF-7 breast cancer cell line after 24 h, has not yet been described. We aimed to examine the effect of Vit C on...

Objectives. The current study dealt with the concept of health literacy in adolescents. The main aim of the study was to examine the structure of adolescents, health literacy. The aim was also to discuss the current need and potential for the development of adolescents, health literacy in educational setting. Sample and settings. The sample compris...

Socioeconomic status is considered to have an effect on one`s economic decision-making, inducing more myopic preferences in poor people. The relationship, however, might not be that straightforward, as economic decision-making should be also determined by financial literacy. Employing a pre-registered cross-validati