{"title":"How to conduct behavioural experiments online.","authors":"Matthew Warburton,Jonathan S Tsay","doi":"10.1038/s41562-026-02465-w","DOIUrl":"https://doi.org/10.1038/s41562-026-02465-w","url":null,"abstract":"","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"148 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147739149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A cluster-randomized trial of labelled cash transfers for uptake of care for chronic conditions among middle-aged and older adults in Burkina Faso.","authors":"Pascal Geldsetzer,Andrew Y Chang,Jana Junghanns,Mamadou Bountogo,Lucienne Ouermi,Pascal Zabre,Ali Sié,Harsh Vivek Harkare,Michaela Theilmann,Guy Harling,Arthur Jacques,Till Bärnighausen","doi":"10.1038/s41562-026-02453-0","DOIUrl":"https://doi.org/10.1038/s41562-026-02453-0","url":null,"abstract":"Non-communicable chronic diseases disproportionately affect people living in low- and middle-income countries, with low linkage to care and healthcare utilization identified as contributors to the considerable unmet treatment need in these settings. Here we assess the effect of labelled cash transfers (LCTs) to incentivize clinic-based uptake of care for chronic conditions in rural Burkina Faso (German Clinical Trials Register DRKS00014734). N = 1,242 adults aged 40 years and older with diagnoses of hypertension, hyperlipidaemia and diabetes were randomized to one of three trial arms to receive a high LCT of 1,000 Franc de la Communauté Financière d'Afrique (FCFA) (~US$2), a lower payment of 500 FCFA or no cash transfer. Cash transfers were labelled with an explanation of their intent. The primary trial endpoints of linkage to care and treatment uptake were not found to be significantly affected by LCT receipt. Most secondary endpoints also did not meet significance. The secondary outcome of rates of face-to-face examinations was paradoxically significantly lower in LCT recipient groups than controls; however, this finding should be interpreted with caution.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"73 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147726212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Economic burden of falls for 190 countries and territories from 2020 to 2050 based on health-augmented macroeconomic modelling.","authors":"Jinxi Li,Ruxu Zhang,Qihua Song,Yanhong Gong,Simiao Chen,Xiaoxv Yin","doi":"10.1038/s41562-026-02451-2","DOIUrl":"https://doi.org/10.1038/s41562-026-02451-2","url":null,"abstract":"Falls contribute to substantial and growing health losses worldwide, yet how they relate to economic output has not been quantified at the global level. Here we estimated the macroeconomic losses attributable to falls in 190 countries and territories for 2020-2050 using a health-augmented macroeconomic model capturing reduced labour supply from mortality and morbidity; heterogeneity in human capital by age, education and experience; and lower capital accumulation from treatment spending. Under the main specification, falls are projected to reduce global output by INT$3.939 trillion (95% uncertainty interval, 3.788-4.096), or 0.088% of the cumulative world gross domestic product. The largest absolute losses occur in the USA, followed by China and Germany. Low- and middle-income countries account for 74.8% of fall-related disability-adjusted life years but only 32.6% of the estimated economic loss, indicating a marked mismatch between health burden and monetized macroeconomic burden. The macroeconomic burden of falls is unevenly distributed globally, underscoring the need for stronger prevention efforts.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"16 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147726244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kyle J LaFollette,Doroteja Rubez,Heath A Demaree,Amit Goldenberg
{"title":"Challenging the mechanism for the implicit association test.","authors":"Kyle J LaFollette,Doroteja Rubez,Heath A Demaree,Amit Goldenberg","doi":"10.1038/s41562-026-02439-y","DOIUrl":"https://doi.org/10.1038/s41562-026-02439-y","url":null,"abstract":"Implicit biases are stereotypes and attitudes that influence decisions and actions, contributing to discrimination and societal inequities. The implicit association test is the most widely used tool for measuring implicit bias, assessing response time in sorting stimuli into labelled categories. Most interpretations assume that implicit association test performance (D-scores) reflects conflicting associative memories or decision ease. We challenged this assumption by decomposing D-scores into additional cognitive processes that may influence results, particularly response caution-the tendency to trade speed for accuracy. Using racing diffusion models across 39 topics (N = 115,601), we found that response caution explained significantly more variance in D-scores beyond decision ease. Response caution also best predicted explicitly reported biases. These findings challenge the traditional interpretation of D-scores as primarily reflecting associative memory activation and highlight the need to consider multiple cognitive processes when assessing implicit biases.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"48 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brendan D. Adkinson, Matthew Rosenblatt, Huili Sun, Javid Dadashkarimi, Link Tejavibulya, Corey Horien, Margaret L. Westwater, Raimundo X. Rodriguez, Stephanie Noble, Dustin Scheinost
{"title":"Feature selection leads to divergent neurobiological interpretations of brain-based machine learning biomarkers","authors":"Brendan D. Adkinson, Matthew Rosenblatt, Huili Sun, Javid Dadashkarimi, Link Tejavibulya, Corey Horien, Margaret L. Westwater, Raimundo X. Rodriguez, Stephanie Noble, Dustin Scheinost","doi":"10.1038/s41562-026-02447-y","DOIUrl":"https://doi.org/10.1038/s41562-026-02447-y","url":null,"abstract":"A central objective in human neuroimaging is to understand the neurobiology underlying cognition and mental health. Machine learning models trained on neuroimaging data are increasingly used as tools for predicting behavioural phenotypes, enhancing precision medicine and improving generalizability compared with traditional MRI studies. However, the high dimensionality of brain connectivity data makes model interpretation challenging. Prevailing practices rely on selecting features and, implicitly, interpreting identified feature networks as uniquely representative of a given phenotype while overlooking others. Despite its widespread use, how univariate feature selection balances the trade-off between simplification for optimizing modelling and oversimplification that misrepresents true neurobiology remains understudied. Here, using four large-scale neuroimaging datasets spanning over 12,000 participants and 13 outcomes, we demonstrate that edges discarded by feature selection can achieve significant prediction accuracies while yielding different neurobiological interpretations. These results are observed across cognitive, developmental and psychiatric phenotypes, extend to both functional connectivity (functional MRI) and structural (diffusion tensor imaging) connectomes, and remain evident in external validation. They suggest that focusing on only the top features may simplify the neurobiological bases of brain–behaviour associations. Such interpretations present only the tip of the iceberg when certain disregarded features may be just as meaningful, potentially contributing to ongoing issues surrounding reproducibility within the field. More broadly, our results reinforce that subtle brain-wide signals should not be ignored.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"2 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147685136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marlene Kritz,Hugh Riddell,Daryn Olsen,Samantha M Harden,Shauna M Burke,Nikos Ntoumanis,Cecilie Thøgersen-Ntoumani
{"title":"Individual versus group-based interventions: a systematic review and meta-analysis of physical activity, functional, psychosocial and health outcomes.","authors":"Marlene Kritz,Hugh Riddell,Daryn Olsen,Samantha M Harden,Shauna M Burke,Nikos Ntoumanis,Cecilie Thøgersen-Ntoumani","doi":"10.1038/s41562-026-02429-0","DOIUrl":"https://doi.org/10.1038/s41562-026-02429-0","url":null,"abstract":"Social influences, including group dynamics, social norms and peer support, are assumed to influence physical activity (PA). A previous systematic review and meta-analysis found that 'true groups' (that is, those applying group dynamics principles) had advantages over individual PA interventions. Given technological advances and virtual platforms, we updated previous findings. Systematic searches of electronic databases were completed on 19 March 2024. A meta-analysis of 71 studies (523 effect sizes) compared individual and group-based PA interventions across behavioural, functional (for example, strength and flexibility), psychosocial (for example, quality of life and loneliness) and health outcomes (for example, VO2max). Using a three-level random effects model, group-based conditions showed a small but non-significant advantage for PA (n = 22,042; g = 0.086, 95% CI (-0.061, 0.233), P = 0.249), psychosocial outcomes (n = 18,223; g = 0.292, 95% CI (-0.171, 0.755), P = 0.214) and health outcomes (n = 31,607; g = 0.125, 95% CI (-0.023, 0.272), P = 0.096). For functional outcomes, a significant advantage for group-based interventions emerged after outlier removal (n = 14,429; g = 0.164, 95% CI (0.032, 0.297), P = 0.015). Moderation analysis indicated that different group types produced comparable effects, except that 'true groups' were associated with a larger effect size for health outcomes. Both individual and group-based approaches (in-person or online) may be effective. Future research should explore mechanisms that enhance their impact across populations and settings. This review was prospectively registered with PROSPERO (CRD42021271452).","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"5 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147684982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ruth E. Appel, Young Mie Kim, Jennifer Pan, Yiqing Xu, Ben Nimmo, Daniel Robert Thomas, Hunt Allcott, Pablo Barberá, Taylor Brown, Adriana Crespo-Tenorio, Drew Dimmery, Deen Freelon, Matthew Gentzkow, Sandra González-Bailón, Andrew M. Guess, Shanto Iyengar, David Lazer, Neil Malhotra, Devra Moehler, Brendan Nyhan, Jaime Settle, Emily Thorson, Rebekah Tromble, Carlos Velasco Rivera, Arjun Wilkins, Magdalena Wojcieszak, Beixian Xiong, Chad Kiewiet de Jonge, Annie Franco, Winter Mason, Natalie Jomini Stroud, Joshua A. Tucker
{"title":"How deceptive online networks reached millions in the US 2020 elections","authors":"Ruth E. Appel, Young Mie Kim, Jennifer Pan, Yiqing Xu, Ben Nimmo, Daniel Robert Thomas, Hunt Allcott, Pablo Barberá, Taylor Brown, Adriana Crespo-Tenorio, Drew Dimmery, Deen Freelon, Matthew Gentzkow, Sandra González-Bailón, Andrew M. Guess, Shanto Iyengar, David Lazer, Neil Malhotra, Devra Moehler, Brendan Nyhan, Jaime Settle, Emily Thorson, Rebekah Tromble, Carlos Velasco Rivera, Arjun Wilkins, Magdalena Wojcieszak, Beixian Xiong, Chad Kiewiet de Jonge, Annie Franco, Winter Mason, Natalie Jomini Stroud, Joshua A. Tucker","doi":"10.1038/s41562-026-02435-2","DOIUrl":"https://doi.org/10.1038/s41562-026-02435-2","url":null,"abstract":"Deceptive online networks are coordinated efforts that use identity deception to pursue strategic political or financial goals. During the US 2020 elections, these networks reached at least 37 million Facebook and 3 million Instagram users, representing 15% and 2% of the platforms’ active US adult users, respectively. Only 3 networks out of 49—1 network with explicitly political aims and 2 that appeared to use politics as a lure for profit—were responsible for over 70% of users reached. Notably, accounts unaffiliated with the networks played an important role in facilitating this reach by resharing content the three networks produced. Deceptive networks, regardless of whether their goals were political or financial, reached users who were older, more conservative, more frequently exposed to content from untrustworthy sources, and spent more time on Facebook.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"111 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147619933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Shifting from brain ageing to brain longevity.","authors":"Sara Palermo","doi":"10.1038/s41562-026-02441-4","DOIUrl":"https://doi.org/10.1038/s41562-026-02441-4","url":null,"abstract":"","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"40 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147625517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexander Bor, Antoine Marie, Lea Pradella, Michael Bang Petersen
{"title":"Social media users experience more political hostility in less economically equal and less democratic societies","authors":"Alexander Bor, Antoine Marie, Lea Pradella, Michael Bang Petersen","doi":"10.1038/s41562-026-02432-5","DOIUrl":"https://doi.org/10.1038/s41562-026-02432-5","url":null,"abstract":"There is widespread concern about the hostility of political discussions on social media, but there is no consensus about the underlying dynamics. In particular, the relationship between online hostility and the broader sociopolitical context has received less attention, in part because of limited research outside Western countries. Here we report results from observational data collected through quota-sampled online surveys in 30 countries across six continents ( <jats:italic>N</jats:italic> = 15,202) about experiences of online hostility. Our findings show that people in less democratic and less economically equal countries experience more hostility online. We also found that, in every country, respondents who are hostile online are also hostile offline and that these people score higher in status-seeking motivations. Exploratory analyses suggest that less democratic societies include more status-motivated individuals and young men—groups showing higher hostility on average. Overall, these findings highlight how online political hostility is intertwined with wider societal tensions.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"6 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147611797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Premature termination of unemployment benefits increased COVID-19 transmission and deaths in the USA.","authors":"Sungbin Park,Kyung Min Lee,John S Earle","doi":"10.1038/s41562-026-02431-6","DOIUrl":"https://doi.org/10.1038/s41562-026-02431-6","url":null,"abstract":"Expanded unemployment insurance (UI) during the COVID-19 pandemic protected livelihoods, but it may also have saved lives by incentivizing physical-distancing behaviour. We estimate UI effects on weekly COVID-19 outcomes using regression-adjusted difference-in-differences and exploiting cross-state variation in the USA during summer 2021. We find that all outcomes more than tripled in states discontinuing pandemic UI programmes: weekly cases rose 0.18 percentage points (95% confidence interval, 0.07-0.28), hospitalizations rose by 0.18 per 1,000 (0.09-0.27), COVID-19 deaths rose by 2.72 per 100,000 (1.23-4.21) and excess deaths rose by 4.60 per 100,000 (2.82-6.39). The results show no pre-trends, pass 'placebo' tests and are robust to alternative sets of control variables, inverse-probability weighting, and heterogeneity in policies, behaviours and political leanings. Supporting a causal interpretation, UI claims fell and re-employment rose in discontinuer states, COVID-19 worsened where re-employment rose more, the COVID-19 death share of under-65-year-olds grew and illness-related lost work time increased. Additional hospitalization costs exceeded UI outlays. COVID-19 deaths rose by 25,100 (11,400-38,900) and excess deaths by 42,600 (26,100-59,100): deaths without benefits.","PeriodicalId":19074,"journal":{"name":"Nature Human Behaviour","volume":"5 1","pages":""},"PeriodicalIF":29.9,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147599425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}