Friday, June 27, 2025

 

Seeing men as the “default” may be tied to attitudes to politicians, Black people



In study, attitudes on these groups were more in line with attitudes on men than women of each group




PLOS

Multi-region investigation of ‘man’ as default in attitudes 

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Plot of regional attitude differences. Regional differences in whether group attitudes are more strongly related to attitudes toward the men or women of the group for (A) attitudes toward politicians, (B) attitudes toward police, and (C) attitudes toward criminals.

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Credit: Phills et al., 2025, PLOS One, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)





In an international study, participants’ attitudes towards certain social groups—namely, politicians and Black people—were more strongly related to their attitudes towards the men than the women of each group, suggesting that men are the “default” for attitudes towards these groups. Curtis Edward Phills of the University of Oregon, U.S., and colleagues present these findings in the open-access journal PLOS One on June 25, 2025.

Prior research has shown how people often discuss some social groups as though they are primarily made up of men, and studies have further explored this view of men as default group members in the contexts of stereotyping, categorization, and memory. For instance, stereotypes about Black people in general align far more closely with stereotypes about Black men than Black women.

However, research on men as the default in the context of attitudes towards different social groups—such as how warm or positive people feel towards each group—is limited. To deepen understanding, Phills and colleagues analyzed data from 5,177 undergraduate students who took a survey measuring their attitudes towards people in general, Black, East Asian, and white people, police officers, politicians, and criminals. The survey also measured attitudes towards the women and men, separately, of each group.

In general, participants’ attitudes towards politicians and Black people were more closely tied to their attitudes towards the men than the women of each group—suggesting “man” as the default for attitudes towards these groups. However, attitudes towards white people were more closely tied to attitudes towards white women than white men. Attitudes towards police officers, criminals, and East Asian people were not strongly related to attitudes towards either the women or men of each group.

Further analysis suggested that female Black and white participants did not see men as the default members of their own racial group. The data also suggest that people in regions with more traditional gender roles may be more likely to view men as the default for attitudes towards social groups, but further research is needed to clarify this.

The findings could aid understanding of the different kinds of prejudice faced by women worldwide.

Curtis Edward Phills adds: “When I think about this research I am filled with so much gratitude for the opportunity to have worked with hundreds of researchers around the world. Each researcher dedicated some of their own laboratory time and space to this project because they believed in the value of collaborative team science. Team science projects like this one are powerful reminders that there is no universal human psychology—how we differ and how we’re similar varies from region to region.

One of the main findings from this work is that on average across all regions in our sample, attitudes toward Black people are much more similar to attitudes toward Black men than Black women. This finding adds to the literature on intersectional invisibility demonstrating that Black women are often excluded from the category ‘Black’—as in people think of a Black man when they imagine a Black person.

However, the strength of this finding varied from region to region. In fact, regional variability was a key finding for all the groups we studied (White people, East Asian people, politicians, police, and criminals). Though these regional findings should be considered ‘preliminary’ or ‘exploratory’, an important point is that regions that endorsed traditional gender roles were more likely to exclude women from their attitudes toward each group.

So, overall, the answer to the question of whether ‘man’ is default in attitudes is: it depends—it depends on which groups and which regions are studied.” 

 

 

In your coverage, please use this URL to provide access to the freely available article in PLOS Onehttps://plos.io/3ZsGGjz

Citation: Phills CE, Miller JK, Buchanan EM, Williams A, Meyers C, Brown ER, et al. (2025) Multi-region investigation of ‘man’ as default in attitudes. PLoS One 20(6): e0323938. https://doi.org/10.1371/journal.pone.0323938

Author countries: U.S., Canada, Denmark, Austria, U.K., Turkey, Taiwan, Thailand, Malaysia, Ecuador, Colombia, Slovakia, Finland, China, Serbia, Portugal, Poland, Norway, India, Israel, Greece, Germany, New Zealand, Nigeria, U.K., Ireland, Australia, Brazil, Oman, Saudia Arabia, United Arab Emirates, Hungary, Kenya.

Funding: M.A. was supported by Slovak Research and Development Agency (APVV-20-0319) (https://www.apvv.sk/?lang=en). R.M.R. was supported by Australian Research Council (DP180102384) (https://www.arc.gov.au/) and the John Templeton Foundation (62631) (https://www.templeton.org/). Z.K. was supported by János Bolyai Research Scholarship of the Hungarian Academy of Science (BO/00746/20) (https://mta.hu/bolyai-osztondij/bolyai-janos-kutatasi-osztondij-105319) G.P.W. was supported by Leverhulme Trust Research Project Grant (RPG-2016-093) (https://www.leverhulme.ac.uk/research-project-grants). I.R. was supported by NPO Systemic Risk Institute (LX22NPO5101) (https://www.syri.cz)). K.B. was supported by National Science Centre, Poland (2019/35/B/HS6/00528) (https://www.ncn.gov.pl/en). G.B. was supported by the Slovak Research and Development Agency (APVV 22-0458) (https://www.apvv.sk/?lang=en). P.A. was supported by Portuguese National Foundation for Science and Technology (FCT UID/PSI/03125/2019) (https://www.fct.pt/en/). M.H. was supported by VEGA 1/0145/23. G.B. was supported by PRIMUS/20/HUM/009. A.L.M. was supported by FAPESP n 2018/16370-5 The funders did not play any role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. There was no additional external funding received for this study.

 

Risk of crime rises when darkness falls



In U.K. study, the risk of certain types of crime, but not others, increased after dark



PLOS

Does darkness increase the risk of certain types of crime? A registered report article 

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Middle Super Output Area (MSOA) boundaries in South Yorkshire.

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Credit: Uttley et al., 2025, PLOS One, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)





A U.K. study of data on more than 30,000 crimes sheds new light on crime after dark, suggesting that the overall risk of crime rises when darkness falls, but that risk varies depending on type of crime and geographical area. Jim Uttley of the University of Sheffield, U.K., and colleagues present these findings in the open-access journal PLOS One on June 25, 2025.

Prior research has shown that darkness reduces people’s feelings of safety, and that improved street lighting can help people feel safer being out after dark. However, research on whether the risk of crime is actually higher after dark has produced inconclusive results.

To help clarify the potential influence of darkness on crime risk, Uttley and colleagues analyzed data on 34,618 crimes that occurred from 2010 through 2019 in the South Yorkshire region of the U.K. Some of these crimes were committed at times of the day that, because of seasonal changes, occur during daylight for part of the year but after dark for the rest of the year. This enabled the researchers to test whether crime risk at such times of day is greater during daylight hours or after dark. The researchers also statistically accounted for other potentially influential factors, such as weather and vacation periods.

The analysis showed that, overall, crimes were more likely to occur after dark than during daylight. However, out of fourteen kinds of crime analyzed, only five appeared to be significantly more likely to occur after dark: burglary, criminal damage, personal robbery, bicycle theft, and vehicle offences. Other offences, including sexual offences, arson and shoplifting, did not show this association.

The analysis also showed that the change in crime risk between daylight and darkness isn’t uniform across all areas in South Yorkshire, with the risk of crime after dark varying by neighborhood.

The researchers conclude that these findings strongly suggest darkness affects risk of crime. Information from this study could be used to help optimize the potential crime-reduction effects of streetlights and other artificial lighting. However, this study did not account for the presence or absence of street lighting. Future research could assess how such artificial lighting and its characteristics, such as brightness, influence crime risk.

The authors add: "There is an assumption that street lighting helps reduce crime. Evidence in support of this assumption is unclear though. In our research we took a step back and asked whether darkness itself increases crime risk. If it doesn't, the presence or absence of street lighting is unlikely to matter. We worked with analysts in South Yorkshire Police to assess changes in the risk of crime taking place in daylight and after dark, using 10 years of crime data. Our findings suggest darkness does increase the risk of certain crimes, including burglary, robbery and criminal damage. We also found the risk of crime after dark varied by neighborhood. We are now working to understand whether street lighting can reduce the risk of crime after dark, and if it can, how we can maximize the crime reduction benefits of street lighting."

 

 

In your coverage, please use this URL to provide access to the freely available article in PLOS Onehttps://plos.io/4mZNKON

Citation: Uttley J, Canwell R, Smith J, Falconer S, Mao Y, Fotios S (2025) Does darkness increase the risk of certain types of crime? A registered report article. PLoS One 20(6): e0324134. https://doi.org/10.1371/journal.pone.0324134

Author countries: U.K.

Funding: The author(s) received no specific funding for this work.

 

Data from Poland, Indonesia and Nepal indicate that affectionate behavior is associated with higher relationship satisfaction - though cultural differences impact how affection is displayed and perceived




PLOS

To hug or not to hug? Public and private displays of affection and relationship satisfaction among people from Indonesia, Nepal, and Poland 

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Main effects of country in ANOVA analyses. Arrows indicate effects significant at p < .05 in Bonferroni-Holm post-hoc tests.  

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Credit: Kocur et al., 2025, PLOS One, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)




Data from Poland, Indonesia and Nepal indicate that affectionate behavior is associated with higher relationship satisfaction - though cultural differences impact how affection is displayed and perceived

Article URLhttps://plos.io/3FLkDOt

Article title: To hug or not to hug? Public and private displays of affection and relationship satisfaction among people from Indonesia, Nepal, and Poland

Author countries: Poland, Nepal, Indonesia

Funding: The author(s) received no specific funding for this work.

 

"Boomerang" made from mammoth tusk is likely one of the oldest known in Europe at around 40,000 years old, per analysis of this artifact from a Polish Upper Paleolithic cave




PLOS

Boomerang and bones: Refining the chronology of the Early Upper Paleolithic at Obłazowa Cave, Poland 

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Prof. Sahra Talamo in the center, with Prof. Paweł Valde-Nowak is on her left, and Prof. Adam Nadachowski on her right.

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Credit: Talamo et al., CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)






Article URLhttps://plos.io/43ScZex

Article title: Boomerang and bones: Refining the chronology of the Early Upper Paleolithic at Obłazowa Cave, Poland

Author countries: Italy, Canada, Switzerland, Poland, U.K., Germany.

Funding: This research was supported by the European Research Council under the European Union’s Horizon 2020 Research and Innovation Programme (grant agreement No. 803147 RESOLUTION, awarded to Sahra Talamo). A.P. collaborates in the Italian grant PRIN20209LLK8S_001 DYNASTY: “Neanderthals dynamic pathway and resilience in central Europe through the chronometric sustainability” funded by the Ministry of University and Research (awarded to Sahra Talamo). The contribution of S.B., A.V. and M.R., was funded by the European Union - Next Generation EU PRIN 2022 TRACE project (awarded to Stefano Benazzi and Adriana Moroni) and by CHANGES, SPOKE 5 “Science and Technologies for Sustainable Diagnostics of Cultural Heritage,” PE 0000020, CUP B53C22003890006, NRP M4C2 Investment 1.3, funded by the European Union—NextGenerationEU. The work of C.F. is supported by the European’s Union Horizon Europe research and innovation program - Marie Skłodowska-Curie Actions, HORIZON-TMA-MSCA-PF-GF (grant agreement: n.101108385 – RISEN). P.V.N.'s participation in preparing this work was supported and financed by the National Science Center, project no. 2021/41/B/HS3/03217: “The Stone Age Man in the Caves of the Tatra Mountains”. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

 

Nitrate in drinking water linked to preterm birth rates



18 years of birth records from Iowa were studied alongside county-level water quality data to study the impact of prenatal nitrate exposure



PLOS

Nitrate in drinking water linked to preterm birth rates 

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Map of Nitrate Measures in Public Water: Iowa (1970-1988). Figure 2 reports the median nitrate level in each month-year of all reported public water measures in Iowa (1970-1988). Each blue point is a nitrate measure (mg/L) <=10 mg/L (the maximum contaminant level set by the EPA). Each red point is a nitrate measure >10 mg/L. Points are shaded by nitrate measure on a continuous scale.

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Credit: Semprini, 2025, PLOS Water, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)





Even low levels of nitrate—a common agricultural runoff and drinking water contaminant—are associated with increased risks of preterm birth and low birthweight babies, according to a new study published June 25 in PLOS Water by Jason Semprini of Des Moines University College of Health Sciences, US.

Nitrate is a naturally occurring compound increasingly found in inorganic fertilizers and, through runoff, in groundwater. When consumed by humans, nitrates can interfere with the blood’s capacity to carry oxygen. Since 1992, the U.S. Environmental Protection Agency (EPA) has a maximum contaminant level for water-based nitrate at 10mg/L.

To evaluate possible reproductive risks, Semprini analyzed 357,741 birth records from Iowa spanning 1970 to 1988, linking each birth to county-level nitrate measurements taken within 30 days of conception. During the study period, nitrate levels rose an average of 8% per year, with a mean exposure of 4.2 mg/L.

After controlling for maternal and paternal characteristics as well as seasonal variation, the study found that early prenatal exposure to greater than 0.1mg/L nitrate—just 1% of the current EPA limit—was associated with an increase in preterm birth (Est.=+0.66%-points; C.I.=0.31, 1.01) and early prenatal exposure to greater than 5mg/L nitrate was associated with an increased risk of low birth weight babies (Est.=+0.33%-points; C.I.=0.03, 0.63). There were no additional risks conferred by exposure to elevated levels of nitrate, above 10 mg/L.

The author points out that the data is limited in scope, focusing only on one state. More recent data, as well as data from additional states and sources, such as private well water, could improve the strength of the association. 

“Our work adds to the evidence base that the current regulatory threshold (> 10mg/L) may be insufficient for protecting the in utero transmission of water-based nitrate during the first trimester of pregnancy,” Semprini says. He concludes that current standards, unchanged since 1992, may need to be revisited as nitrate levels in groundwater continue to rise across the U.S.

He adds: "There is no safe level of prenatal nitrate exposure,” and goes on to state: "[t]he estimated impact from prenatal exposure to nitrates reflects 15% of the harm from prenatal exposure to smoking cigarettes. I do not want to diminish the importance of efforts to prevent smoking during pregnancy...but, I must ask, do we give nitrates 15% of the attention we give to smoking?”

Semprini also notes: "The regulatory threshold for nitrates in public water does not consider prenatal exposure and has not been updated since established in 1992. Ignoring the potential harm from lower levels of prenatal nitrate exposure, the current regulatory standards are not adequately protecting America's mothers or children."

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In your coverage please use this URL to provide access to the freely available article in PLOS Waterhttps://plos.io/3FTtAFx

 

Citation: Semprini J (2025) Early prenatal nitrate exposure and birth outcomes: A study of Iowa’s public drinking water (1970–1988). PLOS Water 4(6): e0000329. https://doi.org/10.1371/journal.pwat.0000329

Author Countries: United States

Funding:  The author received no specific funding for this work.

 

Baby talk – a human superpower?




University of Zurich





An almost universal phenomenon in humans is the use of child-directed speech, where caregivers communicate with children often involving a particular speech style also termed “baby-talk”. Numerous studies have linked the amount of child-directed speech children hear to better learning outcomes (e.g. vocabulary size or literacy skills). This practice seems to facilitate the acquisition of language. But how did this trait evolve?

To explore this, researchers from the University of Zurich (UZH) and the University of Neuchâtel (UNINE), members of the NCCR Evolving Language, and colleagues from universities in France, Germany and the US, have now investigated whether this trait is shared by other great apes.

Experts in baby-talk

In their study, which is on the cover of the journal Science Advances, biologists and linguists observed the use of “infant-directed vocal communication” among five species of great apes: humans, bonobos, chimpanzees, gorillas and orangutans. For this, they meticulously recorded the vocalizations the infants of great apes were exposed to in the wild.

Their results show that, by far, humans are the most frequent “baby-talk” users. “We were surprised by how little of this type of communication we actually observed in our closest living relatives,” explains Franziska Wegdell, UZH postdoc and one of the three first authors of the study.

But how would non-human great ape infants pick up any learned part of their communication system?

Learning by other means

Indeed, even in humans, there are other ways for infants to learn language. “We know that human infants are able to learn new words from overhearing surrounding speech from adults and from other children around them,” says Johanna Schick, UZH postdoc and co-first author. When comparing infant-surrounding communication among the five great ape species, the researchers found that all were exposed to similar levels, except for orangutans. It may be that, like humans, great apes also acquire aspects of their communication system socially but stemming from surrounding communication.

Furthermore, in their study, the researchers only focused on the amount of infant-directed vocal communication, and not on similar phenomena in other forms. “Since speech is a primary modality of language, we chose to begin our research by focusing on the vocal domain,” says Caroline Fryns from UNINE, the third co-first author. “But we know that non-human great apes direct gestures at their infants, and that some of these gestures even exhibit features also found in human infant-directed communication.”

Studying the evolution of child-directed speech

To unravel the evolution of language, an ideal approach would be to examine the language capacities of early humans. However, since language does not fossilize, we have no traces of these capacities in extinct hominin species. “For this reason, we turned our attention to our closest living relatives – non-human great apes – investigating their infant-directed vocal communication,” explains Franziska Wegdell.

The results of the study seem to indicate that the tendency to direct vocalizations at infants has been massively expanded in the human lineage.

Although only found in low levels in our great ape relatives, other species – including some monkeys, bats, cats or dolphins – have been shown to also direct vocalizations at their young. “To shed further light on the evolution of infant-directed communication, future work could compare how the characteristics and functions of this type of communication varies across species and why,” the researchers propose.

 

Link to pictures

https://drive.google.com/drive/folders/1oQMwlzJim9nLVrTs-iASPmfxwAz0NNK_?usp=share_link

More information

NCCR Evolving Language : https://evolvinglanguage.ch