Browsing by Autor "Adrian V. Jaeggi"

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Assessing subclinical psychopathological and personality traits in a small-scale subsistence society
(University of Oxford, 2025) Camila Scaff; Charlotte Van den Driessche; Agustina Bani Cuata; Alberto Vie Tayo; Adrian V. Jaeggi
This study provides a model for developing culturally sensitive tools to measure mental health traits in small-scale societies. It contributes to evolutionary psychiatry by laying the groundwork for quantifying subclinical psychopathology and personality traits, enabling rigorous tests of evolutionary hypotheses.
Indirect genetic effects among neighbors promote cooperation and accelerate adaptation in a small-scale human society
(American Association for the Advancement of Science, 2025) Jordan S. Martin; Bret Beheim; Michael Gurven; Hillard Kaplan; Jonathan Stieglitz; Benjamin C. Trumble; Paul L. Hooper; Daniel K. Cummings; Daniel Eid Rodríguez; Adrian V. Jaeggi
Explaining the rapid evolution of human cooperation and its role in our species' biodemographic success remains a major evolutionary puzzle. To address this challenge, we tested a social drive hypothesis, which predicts that social plasticity and social selection in human groups cause indirect genetic effects that accelerate the adaptation of fitness, promoting population growth via feedback between the environmental causes and evolutionary consequences of cooperation. Using Bayesian multilevel models to analyze fertility data from a small-scale society, we demonstrate that density- and frequency-dependent indirect genetic effects on fitness promote the evolution of cooperation among neighboring women, increasing the rate of contemporary adaptation by ~5×. Our results show how interactions between the genetic and socioecological processes shaping cooperation in reproduction can drive rapid growth and social evolution in human populations.
Not All Stress Is the Same: Variable Associations Between Psychosocial Stressors and Urinary Cortisol Rhythms in a Small‐Scale Subsistence Society
(Wiley, 2026) Dominik C. Jud; Valerie Baettig; Abigail E. Colby; Charlotte Debras; Camila Scaff; Benjamin C. Trumble; Lorin Hutchings; M. Baumgarten; Arnulfo Cary Ista; Adrian V. Jaeggi
While many of these associations had high statistical uncertainty due to wide posterior distributions, the results overall emphasize complex relationships between perceived stressors and diurnal cortisol rhythms among a small-scale subsistence-based society. Future work employing longitudinal designs and higher-resolution sampling will be needed to clarify these trends.
Rapidly declining body temperature in a tropical human population
(American Association for the Advancement of Science, 2020) Michael Gurven; Thomas S. Kraft; Sarah Alami; Juan Copajira Adrian; Edhitt Cortez Linares; Daniel K. Cummings; Daniel Eid Rodríguez; Paul L. Hooper; Adrian V. Jaeggi; Raúl Quispe Gutierrez
Normal human body temperature (BT) has long been considered to be 37.0°C. Yet, BTs have declined over the past two centuries in the United States, coinciding with reductions in infection and increasing life expectancy. The generality of and reasons behind this phenomenon have not yet been well studied. Here, we show that Bolivian forager-farmers (<i>n</i> = 17,958 observations of 5481 adults age 15+ years) inhabiting a pathogen-rich environment exhibited higher BT when first examined in the early 21st century (~37.0°C). BT subsequently declined by ~0.05°C/year over 16 years of socioeconomic and epidemiological change to ~36.5°C by 2018. As predicted, infections and other lifestyle factors explain variation in BT, but these factors do not account for the temporal declines. Changes in physical activity, body composition, antibiotic usage, and thermal environment are potential causes of the temporal decline.