A5023829402- Evolutionary Game Theory and Cooperation
- Evolutionary Psychology and Human Behavior
- Cultural Differences and Values
- Experimental Behavioral Economics Studies
- Personality Traits and Psychology
- Psychology of Moral and Emotional Judgment
- Primate Behavior and Ecology
- Health disparities and outcomes
- Demographic Trends and Gender Preferences
- Social and Intergroup Psychology
- Gender Diversity and Inequality
- Animal Behavior and Reproduction
- Culture, Economy, and Development Studies
- Psychological Well-being and Life Satisfaction
- Cognitive Abilities and Testing
- Rangeland Management and Livestock Ecology
- Employment and Welfare Studies
- Intergenerational and Educational Inequality Studies
- Global Health Care Issues
- Climate Change and Health Impacts
- Animal Vocal Communication and Behavior
- Religion, Gender, and Enlightenment
- Aging, Health, and Disability
- Doping in Sports
- Global Public Health Policies and Epidemiology
University of Richmond
2015-2024
Google (United States)
2023
Institute for Advanced Study in Toulouse
2022
University of California, Santa Barbara
2006-2014
Santa Fe Institute
2014
University of New Mexico
2014
Selection in species with aggressive social interactions favours the evolution of cognitive mechanisms for assessing physical formidability (fighting ability or resource-holding potential). The to accurately assess conspecifics has been documented a number non-human species, but not demonstrated humans. Here, we report tests supporting hypothesis that human architecture includes fighting ability—mechanisms focus on correlates upper-body strength. Across diverse samples targets included US...
Small-scale human societies range from foraging bands with a strong egalitarian ethos to more economically stratified agrarian and pastoral societies. We explain this variation in inequality using dynamic model which population's long-run steady-state level of depends on the extent its most important forms wealth are transmitted within families across generations. estimate degree intergenerational transmission three different types (material, embodied, relational), as well 21 historical...
The five-factor model (FFM) of personality variation has been replicated across a range human societies, suggesting the FFM is universal.However, most studies have restricted to literate, urban populations, which are uncharacteristic majority evolutionary history.We present first test in largely illiterate, indigenous society.Tsimane forager-horticulturalist men and women Bolivia (n = 632) completed translation 44-item Big Five Inventory (Benet-Martínez & John, 1998), widely used metric...
In many human societies, high male social status associates with higher fertility, but the means by which increases lifetime fitness have not been systematically investigated. We analyse pathways begets reproductive success in a small-scale, Amerindian society. Men who are more likely to win dyadic physical confrontation, i.e. dominant men, intra-marital fertility for their age, and men community-wide influence, prestigious exhibit both lower offspring mortality. Both forms of elicit support...
Recent research has shown that humans, like many other animals, have a specialization for assessing fighting ability from visual cues. Because it is probable the voice contains cues of strength and formidability are not available visually, we predicted selection also equipped humans with to estimate physical voice. We found subjects accurately assessed upper-body in voices taken eight samples across four distinct populations language groups: Tsimane Bolivia, Andean herder-horticulturalists...
Social status motivates much of human behavior. However, may have been a relatively weak target selection for evolution if ancestral foragers tended to be more egalitarian. We test the "egalitarianism hypothesis" that has significantly smaller effect on reproductive success (RS) in compared with nonforagers. also between alternative male strategies, particular whether benefits are due lower offspring mortality (parental investment) or increased fertility (mating effort). performed...
Observation of leadership in small-scale societies offers unique insights into the evolution human collective action and origins sociopolitical complexity. Using behavioural data from Tsimane forager-horticulturalists Bolivia Nyangatom nomadic pastoralists Ethiopia, we evaluate traits leaders contexts which becomes more institutional. We find that tend to have capital, form age-related knowledge, body size or social connections. These attributes can reduce costs incur increase efficacy...
Children may be viewed as public goods whereby both parents receive equal genetic benefits yet one parent often invests more heavily than the other. We introduce a microeconomic framework for understanding household investment decisions to address questions concerning conflicts of interest over types and amount work effort among married men women. Although gains costs marriage not spread equally partners, is still favorable, efficient outcome under wide range conditions. This bioeconomic...
We propose that networks of cooperation and allocation social status co-emerge in human groups. substantiate this hypothesis with one the first longitudinal studies a preindustrial society, spanning 8 years. Using network analysis among men, we find large effects kinship, reciprocity transitivity nomination partners over time. Independent these effects, show (i) higher-status individuals gain more partners, (ii) by cooperating higher than themselves. posit hierarchies are egalitarian...
Hunting performance may be one of the most important routes to high prestige or social status among men in hunter-gatherer societies. Higher based on hunting has been linked higher biological fitness outcomes almost everywhere this relationship investigated. This paper explores proximate pathways underlying positive correlation between success and fitness, discusses these light recent debates concerning role Meat obtained from directly provisions families is also distributed other group...
We present empirical measures of wealth inequality and its intergenerational transmission among four horticulturalist populations. Wealth is construed broadly as embodied somatic neural capital, including body size, fertility cultural knowledge, material capital such land household wealth, relational in the form coalitional support field labor. moderate for most forms low resources wealth. Our analysis suggests that domestication alone does not transform social structure; rather, presence...
The challenge hypothesis posits that acute increases in testosterone (T) during male-male competition enhance performance and survivability while limiting the physiological costs of consistently high T. Human research focuses on young men industrial populations, who have higher baseline T levels than subsistence populations. We tested whether Tsimane, pathogenically stressed forager-horticulturalists Bolivian Amazon, would express response to physical competition. Saliva was collected from...
Correlations among distinct behaviors are foundational to personality science, but the field remains far from a consensus regarding causes of such covariation. We advance novel explanation for covariation, which views trait covariance as being shaped within particular socioecology. hypothesize that degree covariation observed society will be inversely related society’s socioecological complexity, is, its diversity social and occupational niches. Using survey data participant samples in 55...
Evolutionary perspectives are part of any comprehensive explanation leadership and, more generally, hierarchy formation in groups. This editorial describes contributions to a special issue on the theme "The evolution and biology leadership: A new synthesis", we reach four main conclusions. First, has been powerful force biological cultural human sociality. Humans have evolved range cognitive behavioral mechanisms (adaptations) that facilitate leader-follower relations, including safeguards...
In high-income countries, one's relative socio-economic position and economic inequality may affect health well-being, arguably via psychosocial stress. We tested this in a small-scale subsistence society, the Tsimane, by associating household wealth (n = 871) community-level 40, Gini 0.15-0.53) with range of psychological variables, stressors, outcomes (depressive symptoms [n 670], social conflicts 401], non-social problems 398], support 399], cortisol 811], body mass index 9,926], blood...