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Fulltext Love as a Commitment Device : Evidence from a Cross-Cultural Study across 90 Countries

Kowal M, Bode A, Koszałkowska K, Roberts SC, Gjoneska B, Frederick D, et al.

Hum Nat, 2024 Dec;35(4):430-450.
PMID: 39725786 DOI: 10.1007/s12110-024-09482-6

Given the ubiquitous nature of love, numerous theories have been proposed to explain its existence. One such theory refers to love as a commitment device, suggesting that romantic love evolved to foster commitment between partners and enhance their reproductive success. In the present study, we investigated this hypothesis using a large-scale sample of 86,310 individual responses collected across 90 countries. If romantic love is universally perceived as a force that fosters commitment between long-term partners, we expected that individuals likely to suffer greater losses from the termination of their relationships-including people of lower socioeconomic status, those with many children, and women-would place a higher value on romantic love compared to people with higher status, those with fewer children, and men. These predictions were supported. Additionally, we observed that individuals from countries with a higher (vs. lower) Human Development Index placed a greater level of importance on romantic love, suggesting that modernization might influence how romantic love is evaluated. On average, participants worldwide were unwilling to commit to a long-term romantic relationship without love, highlighting romantic love's universal importance.
Global Study of Social Odor Awareness

Sorokowska A, Groyecka A, Karwowski M, Frackowiak T, Lansford JE, Ahmadi K, et al.

Chem. Senses, 2018 08 24;43(7):503-513.
PMID: 29955865 DOI: 10.1093/chemse/bjy038

Olfaction plays an important role in human social communication, including multiple domains in which people often rely on their sense of smell in the social context. The importance of the sense of smell and its role can however vary inter-individually and culturally. Despite the growing body of literature on differences in olfactory performance or hedonic preferences across the globe, the aspects of a given culture as well as culturally universal individual differences affecting odor awareness in human social life remain unknown. Here, we conducted a large-scale analysis of data collected from 10 794 participants from 52 study sites from 44 countries all over the world. The aim of our research was to explore the potential individual and country-level correlates of odor awareness in the social context. The results show that the individual characteristics were more strongly related than country-level factors to self-reported odor awareness in different social contexts. A model including individual-level predictors (gender, age, material situation, education, and preferred social distance) provided a relatively good fit to the data, but adding country-level predictors (Human Development Index, population density, and average temperature) did not improve model parameters. Although there were some cross-cultural differences in social odor awareness, the main differentiating role was played by the individual differences. This suggests that people living in different cultures and different climate conditions may still share some similar patterns of odor awareness if they share other individual-level characteristics.
Fulltext Reasons for Facebook Usage: Data From 46 Countries

Kowal M, Sorokowski P, Sorokowska A, Dobrowolska M, Pisanski K, Oleszkiewicz A, et al.

Front Psychol, 2020;11:711.
PMID: 32425849 DOI: 10.3389/fpsyg.2020.00711
A preliminary study on the role of personal history of infectious and parasitic diseases on self-reported health across countries

Pfuhl G, Prazeres F, Kowal M, Aavik T, Abad-Villaverde B, Afhami R, et al.

Public Health, 2025 Mar 23;242:220-227.
PMID: 40127606 DOI: 10.1016/j.puhe.2025.02.030

OBJECTIVES: Infectious diseases are often associated with decline in quality of life. The aim of this study is to analyze the relationship between personal history of communicable, i.e., infectious and parasitic diseases and self-rated health.
STUDY DESIGN: Secondary analysis of a large dataset multi-country observational study.
METHODS: We used a four-pronged analysis approach to investigate whether personal history of infectious and parasitic diseases is related to self-reported health, measured with a single item.
RESULTS: Three of the four analyses found a small positive effect on self-reported health among those reporting a history of pathogen exposure. The meta-analysis found no support but large heterogeneity that was not reduced by two classifications of countries.
CONCLUSION: Personal history of infectious and parasitic diseases does not reduce self-reported health across a global sample.