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Studies of cultural transmission—whether approached by archaeological or ethnographic means—have made great strides in identifying formal teaching and learning arrangements, which in turn can be closely aligned with models of social learning. While novices and apprentices are often in focus in such studies, younger children and their engagement with material culture have received less attention. Against the backdrop of a cross-cultural database of ethnographically documented object use and play in 54 globally distributed foraging communities, we here discuss the ways in which children make and use tools and toys. We provide a cross-cultural inventory of objects made for and by hunter–gatherer children and adolescents. We find that child and adolescent objects are linked to adult material culture, albeit not exclusively so. Toys and tools were primarily handled outside of explicit pedagogical contexts, and there is little evidence for formalised apprenticeships. Our data suggests that children’s self-directed interactions with objects, especially during play, has a critical role in early-age enskillment. Placed within a niche construction framework, we combine ethnographic perspectives on object play with archaeological evidence for play objects to offer an improved cross-cultural frame of reference for how social learning varies across early human life history and what role material culture may play in this process. While our analysis improves the systematic understanding of the role and relevance of play objects among hunter–gatherer societies, we also make the case for more detailed studies of play objects in the context of ethnographic, archival and archaeological cultural transmission research.

Due to postmortem DNA degradation, most ancient genomes sequenced to date have low depth of coverage, preventing the true underlying genotypes from being recovered. Genotype imputation has been put forward to improve genotyping accuracy for low-coverage genomes. However, it is unknown to what extent imputation of ancient genomes produces accurate genotypes and whether imputation introduces bias to downstream analyses. To address these questions, we downsampled 43 ancient genomes, 42 of which are high-coverage (above 10x) and three constitute a trio (mother, father and son), from different times and continents to simulate data with coverage in the range of 0.1x-2.0x and imputed these using state-of-the-art methods and reference panels. We assessed imputation accuracy across ancestries and depths of coverage. We found that ancient and modern DNA imputation accuracies were comparable. We imputed most of the 42 high-coverage genomes downsampled to 1x with low error rates (below 5%) and estimated higher error rates for African genomes, which are underrepresented in the reference panel. We used the ancient trio data to validate imputation and phasing results using an orthogonal approach based on Mendel’s rules of inheritance. This resulted in imputation and switch error rates of 1.9% and 2.0%, respectively, for 1x genomes. We further compared the results of downstream analyses between imputed and high-coverage genomes, notably principal component analysis (PCA), genetic clustering, and runs of homozygosity (ROH). For these three approaches, we observed similar results between imputed and high-coverage genomes using depths of coverage of at least 0.5x, except for African genomes, for which the decreased imputation accuracy impacted ROH estimates. Altogether, these results suggest that, for most populations and depths of coverage as low as 0.5x, imputation is a reliable method with potential to expand and improve ancient DNA studies.

Significance We sequenced the genomes of 15 skeletons from a 5,000-y-old mass grave in Poland associated with the Globular Amphora culture. All individuals had been brutally killed by blows to the head, but buried with great care. Genome-wide analyses demonstrate that this was a large extended family and that the people who buried them knew them well: mothers are buried with their children, and siblings next to each other. From a population genetic viewpoint, the individuals are clearly distinct from neighboring Corded Ware groups because of their lack of steppe-related ancestry. Although the reason for the massacre is unknown, it is possible that it was connected with the expansion of Corded Ware groups, which may have resulted in violent conflict., The third millennium BCE was a period of major cultural and demographic changes in Europe that signaled the beginning of the Bronze Age. People from the Pontic steppe expanded westward, leading to the formation of the Corded Ware complex and transforming the genetic landscape of Europe. At the time, the Globular Amphora culture (3300–2700 BCE) existed over large parts of Central and Eastern Europe, but little is known about their interaction with neighboring Corded Ware groups and steppe societies. Here we present a detailed study of a Late Neolithic mass grave from southern Poland belonging to the Globular Amphora culture and containing the remains of 15 men, women, and children, all killed by blows to the head. We sequenced their genomes to between 1.1- and 3.9-fold coverage and performed kinship analyses that demonstrate that the individuals belonged to a large extended family. The bodies had been carefully laid out according to kin relationships by someone who evidently knew the deceased. From a population genetic viewpoint, the people from Koszyce are clearly distinct from neighboring Corded Ware groups because of their lack of steppe-related ancestry. Although the reason for the massacre is unknown, it is possible that it was connected with the expansion of Corded Ware groups, which may have resulted in competition for resources and violent conflict. Together with the archaeological evidence, these analyses provide an unprecedented level of insight into the kinship structure and social behavior of a Late Neolithic community.

Cultural evolutionary theory conceptualises culture as an information-transmission system whose dynamics take on evolutionary properties. Within this framework, however, innovation has been likened to random mutations, reducing its occurrence to chance or fortuitous transmission error. In introducing the special collection on children and innovation, we here place object play and play objects – especially functional miniatures – from carefully chosen archaeological contexts in a niche construction perspective. Given that play, including object play, is ubiquitous in human societies, we suggest that plaything construction, provisioning, and use have, over evolutionary timescales, paid substantial selective dividends via ontogenetic niche modification. Combining findings from cognitive science, ethology, and ethnography with insights into hominin early developmental life-history, we show how play objects and object play likely had decisive roles in the emergence of innovative capabilities. Importantly, we argue that closer attention to play objects can go some way towards addressing changes in innovation rates that occurred throughout human biocultural evolution and why innovations are observable within certain technological domains but not others.

How did human symbolic behavior evolve? Dating up to about 100,000 y ago, the engraved ochre and ostrich eggshell fragments from the South African Blombos Cave and Diepkloof Rock Shelter provide a unique window into presumed early symbolic traditions of Homo sapiens and how they evolved over a period of more than 30,000 y. Using the engravings as stimuli, we report five experiments which suggest that the engravings evolved adaptively, becoming better-suited for human perception and cognition. More specifically, they became more salient, memorable, reproducible, and expressive of style and human intent. However, they did not become more discriminable over time between or within the two archeological sites. Our observations provide support for an account of the Blombos and Diepkloof engravings as decorations and as socially transmitted cultural traditions. By contrast, there was no clear indication that they served as denotational symbolic signs. Our findings have broad implications for our understanding of early symbolic communication and cognition in H. sapiens.

Over the past decade, the ability to recover whole genomes from ancient remains has emerged as a powerful tool for understanding the human past. From a strictly biological perspective, the sequencing of ancient genomes has resolved the dispute over our evolutionary relationship with Neandertals, revealed the extent of gene flow within and between modern and archaic humans, shed light on genetic and health consequences of this admixture, and uncovered genomic changes in recent human evolution ( 1 ). More generally, the results have made clear that over the course of human history, moving and mating have been more the rule than the exception. The possible benefits of ancient DNA (aDNA) research for archaeology are enormous. Why, then, have aDNA approaches to archaeological questions occasionally raised eyebrows among archaeologists ( 2 , 3 )?

Mental recruitment of previous technological experience in conceptualizations of non-technological phenomena constitutes a specific kind of unintended cognitive effect of human technological activity. This paper discusses particular conceptual takes on a significant epistemic challenge faced by people in the Bronze Age eastern Mediterranean: that of understanding the factors and dynamics governing and allowing the most important celestial body (the sun) to travel across the sky during the day. Textual sources, iconography and artefactual evidence in combination provide an outline of concrete conceptual solutions to this challenge, which centre oncharioteering, i.e., the employment of light, horse-drawn vehicles for high-speed transport. These sources also inform on the actual, practical role played by this technological genre in the context of the eastern Mediterranean Bronze Age. The paper specifies a connection between the actual, mundane and social role of this form of vehicular technology in Bronze Age society, and the conceptualizations of an astronomical phenomenon to which it is recruited. This provides a specific case demonstrating how aspects of concrete, sensorimotor experience of technological activities, here the dynamics of vehicular transport, may ground associative conceptualization of empirically ill-specified phenomena. This, in turn, provides support for the general observation that the conceptual repertoires of individuals and collectives in particular historical contexts are influenced substantially by the experiential spectra associated with the specific ways of life into which they are born.

This paper presents an osteomorphological survey of evidence for draught utilisation of cattle in the South Scandinavian TRB culture. The investigations focus on morphological changes in the lower limb bones of domestic cattle from a large number of archaeological sites and from several individual cattle skeletons found in bogs. The osteological results are discussed in the context of other lines of evidence, both archaeological and environmental, and one of the main themes of this discussion is the relationship between the adoption of animal traction and developments in land use. Furthermore, developments in the economic complex of the South Scandinavian TRB culture are compared with certain trends further south in Europe.

This paper considers the possible etiology of a group of commonly observed but poorly researched pathologies found in archaeological assemblages of animal bones: depressions on the articular surfaces of cattle (Bos taurus) phalanges. Prevalence data from medieval and early modern domestic cattle from England and Neolithic domestic cattle from Denmark are presented, and the explanatory power of associations between lesion frequency, age, sex, body mass and degenerative joint disease are explored. Differential diagnosis suggests that these lesions are caused by one or more development disorders precipitated primarily by hereditary and/or environmental factors. Osteochondrosis is critically evaluated as a possible cause for the observed depressions.

De nombreux elements temoignent de l'importance ideologique des vehicules a roues et des animaux de trait dans une grande partie de l'Eurasie occidentale vers la fin du 4 e et au 3 e millenaire av. J.-C. L'integration de cet ensemble technologique dans les activites quotidiennes etant bien identifiee dans certaines regions, il est evident que cette nouvelle pratique a exerce une plus grande influence conceptuelle dans les communautes en question. En temoignent particulierement des contextes funeraires de l'Europe centrale et de la steppe pontique ou l'usage de vehicules a roues et d'animaux de trait represente un theme important. Cet article introduit un groupe de trouvailles de la peninsule du Jutland (Scandinavie meridionale) dans le debat sur le role de ces elements dans les rites funeraires de la fin du 4 e et du 3 e millenaire. Les dites "tombes a cairn" appartenant a la periode de 3100-2800 au J.-C., et decouvertes dans la partie nord-ouest de la peninsule, sont supposees refleter les grandes tendances ideologiques relatives au transport sur roues qui se manifestent a travers les donnees de l'Europe centrale et de la steppe pontique. Cet article discute la morphologie, le contenu et le symbolisme des tombes a cairn, en partie a la lumiere des decouvertes contemporaines faites sur le continent. Puis, on y discute la situation spatiale des tombes, specialement leur alignement sur les voies de communication modernes, en mettant l'accent sur les tendances locales et regionales.

Bokanmeldelse av Kristin Armstrong Oma’s The Sheep People: The Ontology of Making Lives, Building Homes and Forging Herds in Early Bronze Age Norway