Denmark

**Author(s):** Ottoni, E; Coutinho, P; Falótico, T &lt;br&gt;We surveyed tool use by 3 groups of capuchin monkeys in S. das Confusões Nat. Park (Brazil), a savannah population equidistant from two long-term study sites - Faz. Boa Vista, where monkeys are expert nutcrackers, but do not use digging stones nor probes, and S. da Capivara, where all 3 are customary. We employed direct observation, camera traps, indirect observation of tool use sites, and two experiments, one on induced seeds&#39; excavation, the other on probe use, based in a previous comparative study (FBV x PNSC). Nutcracking was observed as expected, but no probing. Stone-aided digging of arthropods and tubers was indirectly registered in the range of one group; one of the other groups (the only one to take part) did not use tools in the digging experiment. In the molasses-probing task, monkeys did not succeed, except by one innovator, but made inept attempts to hit the box with sticks or stones. The results on stone-aided digging are not conclusive but suggest resource-availability causes. The apparent absence of customary probe use, with no clear environmental causes, seems to point to a lower probability of the establishment of a tradition with less cultural niche construction.

Cultural Evolution Society 2022

Comparing the toolkits of three savannah populations of bearded capuchin monkeys (Sapajus libidinosus): environmental and traditional factors.

bearded capuchin monkeys; tool use; primatology; behavioural traditions; cultural niche construction

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Molsamp 2021

**Author(s):** Ottoni, E; Coutinho, P; Falótico, T <br>We surveyed tool use by 3 groups of capuchin monkeys in S. das Confusões Nat. Park (Brazil), a savannah population equidistant from two long-term study sites - Faz. Boa Vista, where monkeys are expert nutcrackers, but do not use digging stones nor probes, and S. da Capivara, where all 3 are customary. We employed direct observation, camera traps, indirect observation of tool use sites, and two experiments, one on induced seeds' excavation, the other on probe use, based in a previous comparative study (FBV x PNSC). Nutcracking was observed as expected, but no probing. Stone-aided digging of arthropods and tubers was indirectly registered in the range of one group; one of the other groups (the only one to take part) did not use tools in the digging experiment. In the molasses-probing task, monkeys did not succeed, except by one innovator, but made inept attempts to hit the box with sticks or stones. The results on stone-aided digging are not conclusive but suggest resource-availability causes. The apparent absence of customary probe use, with no clear environmental causes, seems to point to a lower probability of the establishment of a tradition with less cultural niche construction.

technical paper

### Welcome to the fourth Cultural Evolution Society Conference, CES2022! 

As last year, Underline will support the online component of the conference. The ongoing COVID-19 pandemic is causing a great deal of uncertainty for all of us. Therefore, we seek to offer a hybrid format that will hopefully allow some folks to travel to Aarhus, others to meet up locally or regionally in CES hub-lets, and other yet to participate online. The field of cultural evolution is growing in size and scope; its theories, methods and applications - both academic and applied - are getting ever more robust. Do join us in what promises to be an exciting exchange of ideas and a celebration of our field.

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#### The CES 2022 local organising committee
* Luseadra Joy McKerracher
* Jesper Sørensen 
* Niels Nørkjær Johannsen 
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* Felix Riede
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<br><br>

Please click on the button bellow if you want to watch the videos

The field of cultural evolution is growing in size and scope; its theories, methods and applications - both academic and applied - are getting ever more robust. Do join us in what promises to be an exciting exchange of ideas and a celebration of our field.

**Author(s):** Albuquerque, R; Codogno, B; dos Santos, B; Izar, P <br><br>In primates, touching is fundamental for the social development of infants. We hypothesized that the frequency of touching the face of other individuals by Sapajus libidinosus infants, assuming an active role within their social network, is correlated to the number of social interactions they establish. We analyzed 41 hours of videos of a wild capuchin group at Piauí, Brazil, recorded using focal animal sampling, from the digital data collection from the Laboratory of Ethology, Development and Social Interactions, corresponding to the 1st, 2nd and 3rd months of life of 6 infants (3 males and 3 females). All social interactions and facial touches involving the infant under analysis were coded. A total of 485 interactions and 45 touches were registered. We conducted a GLMM, considering individual and month as fixed effects and sex as a random variable. We found no correlation between the number of interactions of the infant and the number of touches on the face of other individuals. Future studies should investigate other factors, such as infant temperament, that might explain variation in frequency of touching.

Is the touch of capuchin monkeys infants (Sapajus libidinosus) on other individuals influenced by their popularity?

Humans use a wide variety of representational patterns to express numbers. Some of these representations also straddle different modalities, and sign languages (SLs) are a prime example: Their users produce and receive signals in visuospatial space but adopt tools and strategies linked to the oral/auditory modality; and in SLs numerals resemble notational systems. At the same time, systems may possess rare features that are neither attested in SLs used by neighboring communities nor related to the surrounding spoken languages. Such features include, for instance, how compound numbers are structured or whether number representation is quantitative or symbolic, and whether the form involves hand movements or repetitions. Because of this variety in structure and form, numerals in SLs challenge cross-modality feature analysis. In this talk, I will show how a distributed cognition approach can be made fruitful for their analysis. This approach recognizes that numerical cognition operates on information that is distributed across internal and external representations, and that the way in which numbers are externally represented shapes cognitive behaviors (representational effects).


A distributed approach to numerals in sign languages

In groups of the Evangelical tradition, public conversion testimonies are essential when considering a neophyte for membership. Interestingly, in these groups, every member must undergo conversion experience and display their converted nature – actual converts and those brought up in the tradition. In their public conversion testimonies, members signal their loyalty to the group and try to convince others about their commitment and trustworthiness. Contrary to the group's theology that both groups of neophytes are equal, my previous study found significant differences in public conversion testimonies between the individuals who have been part of the group since childhood and strangers in the effort to persuade others operationalized as the length of testimony and amount of negative self-depiction. Except for this difference in public conversion testimonies, their function remains unknown, and we are at the beginning of its understanding. Based on these findings, I'd like to present a research design to study changes in commitment for both groups and if high-conversion performers are treated more for their commitment than low-conversion performers.

Public conversion testimonies and group commitment

We investigate how aggression towards enemy out-group spreads among in-groups during intergroup conflicts. Focusing on the role of learning biases, we tested whether prestige and credibility enhancing displays of in-group leaders motivate other in-groups to participate in intergroup aggression. Using a minimal group paradigm and an intergroup prisoner’s dilemma with maximized differences on a Czech sample, our results show that the transmission of intergroup aggression is promoted by credibility enhancing displays and by the prestige of group leaders, not their dominance. Furthermore, taking advantage of the naturally occurring event, the storming of the US Capitol, we studied whether group affiliation influences how Americans perceive the aggressive behavior of the shooting officer and shot A. E. Babbitt. Our findings suggest that the group affiliation and the support for the storming predict perceived prestige and dominance diversely for both actors. We conclude that given the context of an intergroup conflict, leaders can increase participation in aggressive behaviors towards out-groups by prestigious motivation, sidestepping the coercive pathway of dominance.

Effect of prestige and CREDs on intergroup aggression

Groups mediate the transmission of culture and are often the center of cooperative activities. They are also dynamic, contingent on socio-environmental conditions. Here I introduce a statistical and ethnographic data collection framework for mapping the relationships between group identities, anticipating complementary work that will reveal the driving forces behind group topologies.

Group topology

Across many countries, the Russian invasion of Ukraine prompted individuals to help anonymous and more or less distant Ukrainians fleeing or defending their country. Utilizing this crisis as a natural experiment, we tested evolutionary mechanisms hypothetically responsible for this surge of extra-group prosociality, focusing on kin-based, kith-based, and indirect reciprocity, and moralizing gods beliefs. On a sample of 3051 participants from 16 countries recruited in an online survey, we measured relatedness coefficients, reciprocal relations with Ukrainian friends, cultural and geographical distance from Ukraine, and moralizing gods beliefs to test their effects on three forms of extra-group prosociality: monetary donations, volunteering, and attending pro-Ukraine happenings. While attending happenings is predicted by kin and kith ties, volunteering is also predicted by the belief in a moralizing god. Data on monetary donations are still being cleaned and are yet to be modeled. For now, we argue that the differences in the effects of the studied predictors rely to the costliness of the forms of extra-group prosociality and the sampled populations’ distance from Ukraine.

Helping Ukraine: Mechanisms promoting extra-group prosociality towards the Ukrainians during the 2022 invasion

Human culture, despite its immense complexity, is often reduced to fit into a particular framework when studied quantitatively. We know, thanks to the number of studies to date, that people select among the available variants while modifying them during transmission. We also know that different biases play a role in this process. We set out to combine existing approaches into a single mathematical model and determine the extent to which they affect cultural transmission. Our main objective is to estimate parameter values in a continuous cultural inheritance model that considers the proportionality in variance between cultural parents and offspring while taking factors such as conformity bias or cultural attraction into consideration. This poster introduces the data collection app, styled as a simple transmission-chain quiz game. While answering the questions, participants are presented with tips of previous players as hints. We are able to modify the transmission parameters (e.g. selection pressure on tips in each generation or diversity of tips presented to the first generation of participants), which allows us to reliably parametrize the process of cultural transmission.

Tip for Science: New app lets you study cultural transmission of continuous traits

Archaeological and anthropological research on war has linked the taking of human body parts as trophies with transitions to sedentism, farming, and political centralization: trophies could increase status of warriors in societies with achieved inequality, project political power for leaders relying on violent coercion of internal and external populations, and were often linked with beliefs about agricultural fertility. This study tests whether institutionalized trophy-taking in war was more likely in societies 1) at intermediate levels of social complexity, 2) engaging in violent political expansion, and 3) dependent on agriculture. A dataset of 113 societies was coded from ethnographic and secondary historical/archaeological sources. Bayesian logistic regressions were used to test the likelihood of trophy-taking from the predictors, using a DAG to adjust for appropriate covariates. None of the hypotheses was supported. There was some evidence for a negative effect of social complexity (95% CI largely negative across models). This could be interpreted as less display-oriented violence in complex societies reliant on more egalitarian/cooperative ideologies. It is also possible the sample or coding was biased, such as with the measurement of social complexity, or that trophy-taking is too broad a phenomenon to be consistently associated with any of the hypothesized drivers.

A cross-cultural analysis of social complexity and the taking of human body parts as trophies during war

Introduction. This poster celebrates advances in the study of culture in non-human taxa indexed by articles appearing in the two highest profile science journals. The present century has witnessed a remarkable surge in the quality and quantity of these studies and their reception in such journals. Approach. Titles of articles on animal culture together with brief abstracts and key illustrations extracted from Nature and Science are displayed, to illustrate the range of taxa and cultural phenomena addressed. Findings. Twenty titles are available in the present century alone, a majority from just the last decade. Reports of culture cover an expanding range of species including primates, cetaceans, birds and insects. Behavioural domains are no less diverse, from mate choice to foraging techniques, vocal repertoires and migration routes. Evidence extends to gene-culture co-evolution. Implications for conservation are now under review by IUCN and UN. Conclusions. The studies collated here index the growing recognition that cultural phenomena are widespread in animals. They provide a robust and exciting platform from which to further explore the scope of culture in non-human species.

Animal Culture Studies Advance in the Pages of Nature and Science

Social primates exhibit a vast behavioural and cultural repertoire. Understanding the ontogeny of sociability in primates can bring important findings in comparative studies between human and non-human cultures. In this context, our objective was to analyse the development of the social personality of 12 wild capuchin monkeys (Sapajus libidinosus) and test if sex and monkey identity affected the social personality. We used videos recorded in the wild during the first 3 years of life of 6 males and 6 females and analysed the rate of emission of affiliative social behaviours, such as grooming, lipsmacking and others. We used GLMMs and tested the repeatability of behaviours for statistical analysis. The results showed low repeatability for monkey identity and sex as random effects The population exhibited high values of inter and intraindividual variance in the emission of behaviours, especially during the first year and a half of life, that is the infancy of S. libidinosus. The repeatability values stabilised in the juvenile period, but remained low. Our results show that social personality is not yet established in the first three years of life for these primates. Longitudinal studies following the individuals until adulthood are necessary to understand if and when personality is consolidated in capuchin monkeys.

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