A V Jaeggi
Biographic Data
| ID | 17929 |
|---|---|
| NAME | A V Jaeggi |
| GIVEN NAMES | A V |
| FAMILY NAME | Jaeggi |
| SIGNATURE | JAEGGI A V |
| AFFILIATIONS | University of Zurich |
| ORCID | 0000-0003-1695-0388 |
| VERIFIED | Yes |
| TOTAL WORKS | 24 |
| TOTAL CITATIONS | 167 |
| AUTHOR COUNT | 24 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2008 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 5 |
Not All Stress Is the Same: Variable Associations Between Psychosocial Stressors and Urinary Cortisol Rhythms in a Small‐Scale Subsistence Society
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
Object play in Tsimane children: Implications for Sex-Specific Division of Labour
Sex-specific division of labour and the associated use of different subsistence techniques by males (e.g. hunting) and females (e.g. gathering) has played an important role in shaping human societies. Skills needed in adulthood are practiced in play during childhood and object play has been proposed to foster tool-use skills necessary for adult subsistence techniques. Here, we investigated sex differences in the ontogeny of object play in Tsimane…
Cognitive foundations for helping and harming others: Making welfare tradeoffs in industrialized and small-scale societies
Dominance or Tolerance? Causes and consequences of a period of increased intercommunity encounters among bonobos (Pan paniscus) at LuiKotale
Group-living primates exhibit variable reactions to intergroup encounters (or IGEs), reflecting species-specific strategies and individual motivations. In chimpanzees ( Pan troglodytes ), dominating in IGEs provides fitness benefits. Less is known about responses to IGEs in bonobos ( Pan paniscus ) despite their equal relevance for understanding the origins of human intergroup relations. We observed the Bompusa West (WBp) bonobo community at LuiK…
Life-history tradeoffs in a historical population (1896–1939) undergoing rapid fertility decline: Costs of reproduction
Evolutionary demographers often invoke tradeoffs between reproduction and survival to explain reductions in fertility during demographic transitions. The evidence for such tradeoffs in humans has been mixed, partly because tradeoffs may be masked by individual differences in quality or access to resources. Unmasking tradeoffs despite such phenotypic correlations requires sophisticated statistical analyses that account for endogeneity among variab…
Specialised minds: Extending Adaptive Explanations of Personality to the Evolution of Psychopathology
Traditional evolutionary theory invoked natural and sexual selection to explain species- and sex-typical traits. However, some heritable inter-individual variability in behaviour and psychology – personality – is probably adaptive. Here we extend this insight to common psychopathological traits. Reviewing key findings from three background areas of importance – theoretical models, non-human personality and evolved human social dynamics – we propo…
Novel phylogenetic methods reveal that resource-use intensification drives the evolution of “complex” societies
Explaining the rise of large, sedentary populations, with attendant expansions of socio-political hierarchy and labor specialization (collectively referred to as “societal complexity”), is a central problem for social scientists and historians. Adoption of agriculture has often been invoked to explain the rise of complex societies, but archaeological and ethnographic records contradict simple agri-centric models. Rather than a unitary phenomenon,…
Gains to cooperation drive the evolution of egalitarianism
The evolution of daily food sharing: A Bayesian phylogenetic analysis
Explaining marriage patterns in a globally representative sample through socio-ecology and population history: A Bayesian phylogenetic analysis using a new supertree
Archaeology and the Origins of Human Cumulative Culture: A Case Study from the Earliest Oldowan at Gona, Ethiopia
The capacity of Homo sapiens for the intergenerational accumulation of complex technologies, practices, and beliefs is central to contemporary accounts of human distinctiveness. However, the actual antiquity and evolutionary origins of cumulative culture are not known. Here we propose and exemplify a research program for studying the origins of cumulative culture using archaeological evidence. Our stepwise approach disentangles assessment of the …
Food‐Sharing Models
Food sharing is one of the most obvious forms of cooperation among hunter‐gatherers and is intricately linked to the evolved human life history and foraging niche; it is also observed in other primates. Theoretical models of food sharing go back to the asymmetric Hawk–Dove game, wherein the individual who derives greater value from a resource should be more willing to fight over it (Hawk), whereas the other defers (Dove). When humans or other pri…
Group‐level competition influences urinary steroid hormones among wild red–tailed monkeys, indicating energetic costs
Various theories emphasize that intergroup competition should affect intragroup cooperation and social relationships, especially if the cost of intergroup competition outweighs that of intragroup competition. This cost of intergroup competition may be quantified by changes in physiological status, such as in the steroid hormones cortisol (C) and testosterone (T), which rise or are depressed during periods of energetic stress, respectively. Here w…
Nothing but Mammals? Review of Tim Clutton-Brock’s Mammal Societies: (Wiley, 2016)
Human grooming in comparative perspective: People in six small‐scale societies groom less but socialize just as much as expected for a typical primate
OBJECTIVES: Grooming has important utilitarian and social functions in primates but little is known about grooming and its functional analogues in traditional human societies. We compare human grooming to typical primate patterns to test its hygienic and social functions. MATERIALS AND METHODS: Bayesian phylogenetic analyses were used to derive expected human grooming time given the potential associations between grooming, group size, body size, …
Men’s status and reproductive success in 33 nonindustrial societies: Effects of subsistence, marriage system, and reproductive strategy
Significance Much of human behavior results from a desire for social status. From an evolutionary perspective, answering the question of why we pursue status must consider how status affects reproduction, especially in nonindustrial societies with natural fertility. In a metaanalysis of 288 results from 33 nonindustrial populations, we find that status is significantly associated with men’s reproductive success, consistent with an evolved basis f…
Growth references for Tsimane forager‐horticulturalists of the Bolivian Amazon
International references for BMI-for-age and WFH are likely appropriate for Tsimane, but differences in height-for-age and weight-for-age suggest Tsimane specific references may be useful for these measures
Food Sharing
Food sharing is a human universal trait that forms the centerpiece of economic and social life in hunter‐gatherer societies. Human livelihoods require sharing at all life stages: to support infancy, childhood, and adolescence, and to help reduce risk of daily food shortfalls in adulthood. Attempts to understand the evolved human life history require an examination of the conditions that led to the evolution of food sharing. We summarize key findi…
Does Market Integration Buffer Risk, Erode Traditional Sharing Practices and Increase Inequality? A Test among Bolivian Forager-Farmers
Mechanisms of reciprocity in primates: Testing for short-term contingency of grooming and food sharing in bonobos and chimpanzees
Natural cooperators: Food sharing in humans and other primates
The study of cooperation is rich with theoretical models and laboratory experiments that have greatly advanced our knowledge of human uniqueness, but have sometimes lacked ecological validity. We therefore emphasize the need to tie discussions of human cooperation to the natural history of our species and its closest relatives, focusing on behavioral contexts best suited to reveal underlying selection pressures and evolved decision rules. Food sh…
Social learning of diet and foraging skills by wild immature Bornean orangutans: Implications for culture
Studies of social learning in the wild are important to complement findings from experiments in captivity. In this field study, immature Bornean orangutans rarely foraged independently but consistently followed their mothers' choices. Their diets were essentially identical to their mothers' even though not all mothers had the same diet. This suggests vertical transmission of diet by enhancement. Also, immatures selectively observed their mothers …
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Begging for information: Mother–offspring food sharing among wild Bornean orangutans
Transfer of solid food from mothers or other adults to dependent offspring is commonly observed in various primate species and both nutritional and informational benefits have been proposed to explain the function of such food sharing. Predictions from these hypotheses are tested using observational data on wild orangutans ( Pongo pygmaeus wurmbii ) at Tuanan, Central Borneo, Indonesia. In 1,145 hr of focal observation and 458 recorded food inter…
Archaeology and the Origins of Human Cumulative Culture: A Case Study from the Earliest Oldowan at Gona, Ethiopia
The capacity of Homo sapiens for the intergenerational accumulation of complex technologies, practices, and beliefs is central to contemporary accounts of human distinctiveness. However, the actual antiquity and evolutionary origins of cumulative culture are not known. Here we propose and exemplify a research program for studying the origins of cumulative culture using archaeological evidence. Our stepwise approach disentangles assessment of the …
Does Market Integration Buffer Risk, Erode Traditional Sharing Practices and Increase Inequality? A Test among Bolivian Forager-Farmers
Natural cooperators: Food sharing in humans and other primates
The study of cooperation is rich with theoretical models and laboratory experiments that have greatly advanced our knowledge of human uniqueness, but have sometimes lacked ecological validity. We therefore emphasize the need to tie discussions of human cooperation to the natural history of our species and its closest relatives, focusing on behavioral contexts best suited to reveal underlying selection pressures and evolved decision rules. Food sh…
Growth references for Tsimane forager‐horticulturalists of the Bolivian Amazon
International references for BMI-for-age and WFH are likely appropriate for Tsimane, but differences in height-for-age and weight-for-age suggest Tsimane specific references may be useful for these measures
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Life-history tradeoffs in a historical population (1896–1939) undergoing rapid fertility decline: Costs of reproduction
Evolutionary demographers often invoke tradeoffs between reproduction and survival to explain reductions in fertility during demographic transitions. The evidence for such tradeoffs in humans has been mixed, partly because tradeoffs may be masked by individual differences in quality or access to resources. Unmasking tradeoffs despite such phenotypic correlations requires sophisticated statistical analyses that account for endogeneity among variab…
Specialised minds: Extending Adaptive Explanations of Personality to the Evolution of Psychopathology
Traditional evolutionary theory invoked natural and sexual selection to explain species- and sex-typical traits. However, some heritable inter-individual variability in behaviour and psychology – personality – is probably adaptive. Here we extend this insight to common psychopathological traits. Reviewing key findings from three background areas of importance – theoretical models, non-human personality and evolved human social dynamics – we propo…
Gains to cooperation drive the evolution of egalitarianism
Human grooming in comparative perspective: People in six small‐scale societies groom less but socialize just as much as expected for a typical primate
OBJECTIVES: Grooming has important utilitarian and social functions in primates but little is known about grooming and its functional analogues in traditional human societies. We compare human grooming to typical primate patterns to test its hygienic and social functions. MATERIALS AND METHODS: Bayesian phylogenetic analyses were used to derive expected human grooming time given the potential associations between grooming, group size, body size, …
Novel phylogenetic methods reveal that resource-use intensification drives the evolution of “complex” societies
Explaining the rise of large, sedentary populations, with attendant expansions of socio-political hierarchy and labor specialization (collectively referred to as “societal complexity”), is a central problem for social scientists and historians. Adoption of agriculture has often been invoked to explain the rise of complex societies, but archaeological and ethnographic records contradict simple agri-centric models. Rather than a unitary phenomenon,…
Dominance or Tolerance? Causes and consequences of a period of increased intercommunity encounters among bonobos (Pan paniscus) at LuiKotale
Group-living primates exhibit variable reactions to intergroup encounters (or IGEs), reflecting species-specific strategies and individual motivations. In chimpanzees ( Pan troglodytes ), dominating in IGEs provides fitness benefits. Less is known about responses to IGEs in bonobos ( Pan paniscus ) despite their equal relevance for understanding the origins of human intergroup relations. We observed the Bompusa West (WBp) bonobo community at LuiK…
Begging for information: Mother–offspring food sharing among wild Bornean orangutans
Transfer of solid food from mothers or other adults to dependent offspring is commonly observed in various primate species and both nutritional and informational benefits have been proposed to explain the function of such food sharing. Predictions from these hypotheses are tested using observational data on wild orangutans ( Pongo pygmaeus wurmbii ) at Tuanan, Central Borneo, Indonesia. In 1,145 hr of focal observation and 458 recorded food inter…
Social learning of diet and foraging skills by wild immature Bornean orangutans: Implications for culture
Studies of social learning in the wild are important to complement findings from experiments in captivity. In this field study, immature Bornean orangutans rarely foraged independently but consistently followed their mothers' choices. Their diets were essentially identical to their mothers' even though not all mothers had the same diet. This suggests vertical transmission of diet by enhancement. Also, immatures selectively observed their mothers …
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Mechanisms of reciprocity in primates: Testing for short-term contingency of grooming and food sharing in bonobos and chimpanzees
Natural cooperators: Food sharing in humans and other primates
The study of cooperation is rich with theoretical models and laboratory experiments that have greatly advanced our knowledge of human uniqueness, but have sometimes lacked ecological validity. We therefore emphasize the need to tie discussions of human cooperation to the natural history of our species and its closest relatives, focusing on behavioral contexts best suited to reveal underlying selection pressures and evolved decision rules. Food sh…
Food Sharing
Food sharing is a human universal trait that forms the centerpiece of economic and social life in hunter‐gatherer societies. Human livelihoods require sharing at all life stages: to support infancy, childhood, and adolescence, and to help reduce risk of daily food shortfalls in adulthood. Attempts to understand the evolved human life history require an examination of the conditions that led to the evolution of food sharing. We summarize key findi…
Does Market Integration Buffer Risk, Erode Traditional Sharing Practices and Increase Inequality? A Test among Bolivian Forager-Farmers
Men’s status and reproductive success in 33 nonindustrial societies: Effects of subsistence, marriage system, and reproductive strategy
Significance Much of human behavior results from a desire for social status. From an evolutionary perspective, answering the question of why we pursue status must consider how status affects reproduction, especially in nonindustrial societies with natural fertility. In a metaanalysis of 288 results from 33 nonindustrial populations, we find that status is significantly associated with men’s reproductive success, consistent with an evolved basis f…
Growth references for Tsimane forager‐horticulturalists of the Bolivian Amazon
International references for BMI-for-age and WFH are likely appropriate for Tsimane, but differences in height-for-age and weight-for-age suggest Tsimane specific references may be useful for these measures
Nothing but Mammals? Review of Tim Clutton-Brock’s Mammal Societies: (Wiley, 2016)
Human grooming in comparative perspective: People in six small‐scale societies groom less but socialize just as much as expected for a typical primate
OBJECTIVES: Grooming has important utilitarian and social functions in primates but little is known about grooming and its functional analogues in traditional human societies. We compare human grooming to typical primate patterns to test its hygienic and social functions. MATERIALS AND METHODS: Bayesian phylogenetic analyses were used to derive expected human grooming time given the potential associations between grooming, group size, body size, …
Food‐Sharing Models
Food sharing is one of the most obvious forms of cooperation among hunter‐gatherers and is intricately linked to the evolved human life history and foraging niche; it is also observed in other primates. Theoretical models of food sharing go back to the asymmetric Hawk–Dove game, wherein the individual who derives greater value from a resource should be more willing to fight over it (Hawk), whereas the other defers (Dove). When humans or other pri…
Group‐level competition influences urinary steroid hormones among wild red–tailed monkeys, indicating energetic costs
Various theories emphasize that intergroup competition should affect intragroup cooperation and social relationships, especially if the cost of intergroup competition outweighs that of intragroup competition. This cost of intergroup competition may be quantified by changes in physiological status, such as in the steroid hormones cortisol (C) and testosterone (T), which rise or are depressed during periods of energetic stress, respectively. Here w…
The evolution of daily food sharing: A Bayesian phylogenetic analysis
Explaining marriage patterns in a globally representative sample through socio-ecology and population history: A Bayesian phylogenetic analysis using a new supertree
Archaeology and the Origins of Human Cumulative Culture: A Case Study from the Earliest Oldowan at Gona, Ethiopia
The capacity of Homo sapiens for the intergenerational accumulation of complex technologies, practices, and beliefs is central to contemporary accounts of human distinctiveness. However, the actual antiquity and evolutionary origins of cumulative culture are not known. Here we propose and exemplify a research program for studying the origins of cumulative culture using archaeological evidence. Our stepwise approach disentangles assessment of the …
Novel phylogenetic methods reveal that resource-use intensification drives the evolution of “complex” societies
Explaining the rise of large, sedentary populations, with attendant expansions of socio-political hierarchy and labor specialization (collectively referred to as “societal complexity”), is a central problem for social scientists and historians. Adoption of agriculture has often been invoked to explain the rise of complex societies, but archaeological and ethnographic records contradict simple agri-centric models. Rather than a unitary phenomenon,…
Gains to cooperation drive the evolution of egalitarianism
Dominance or Tolerance? Causes and consequences of a period of increased intercommunity encounters among bonobos (Pan paniscus) at LuiKotale
Group-living primates exhibit variable reactions to intergroup encounters (or IGEs), reflecting species-specific strategies and individual motivations. In chimpanzees ( Pan troglodytes ), dominating in IGEs provides fitness benefits. Less is known about responses to IGEs in bonobos ( Pan paniscus ) despite their equal relevance for understanding the origins of human intergroup relations. We observed the Bompusa West (WBp) bonobo community at LuiK…
Life-history tradeoffs in a historical population (1896–1939) undergoing rapid fertility decline: Costs of reproduction
Evolutionary demographers often invoke tradeoffs between reproduction and survival to explain reductions in fertility during demographic transitions. The evidence for such tradeoffs in humans has been mixed, partly because tradeoffs may be masked by individual differences in quality or access to resources. Unmasking tradeoffs despite such phenotypic correlations requires sophisticated statistical analyses that account for endogeneity among variab…
Specialised minds: Extending Adaptive Explanations of Personality to the Evolution of Psychopathology
Traditional evolutionary theory invoked natural and sexual selection to explain species- and sex-typical traits. However, some heritable inter-individual variability in behaviour and psychology – personality – is probably adaptive. Here we extend this insight to common psychopathological traits. Reviewing key findings from three background areas of importance – theoretical models, non-human personality and evolved human social dynamics – we propo…
Cognitive foundations for helping and harming others: Making welfare tradeoffs in industrialized and small-scale societies
Object play in Tsimane children: Implications for Sex-Specific Division of Labour
Sex-specific division of labour and the associated use of different subsistence techniques by males (e.g. hunting) and females (e.g. gathering) has played an important role in shaping human societies. Skills needed in adulthood are practiced in play during childhood and object play has been proposed to foster tool-use skills necessary for adult subsistence techniques. Here, we investigated sex differences in the ontogeny of object play in Tsimane…
Not All Stress Is the Same: Variable Associations Between Psychosocial Stressors and Urinary Cortisol Rhythms in a Small‐Scale Subsistence Society
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
Biology (17 works) · Psychology (14 works) · Evolutionary Psychology and Human Behavior (12 works) · Primate Behavior and Ecology (12 works) · Ecology (10 works) · Evolutionary Game Theory and Cooperation (9 works) · Social Psychology (8 works) · Sociology (8 works) · Demography (6 works) · Ecology (6 works)