The revolution that wasn't: a new interpretation of the origin of modern human behavior.

Not by Genes Alone: How Culture Transformed Human Evolution

Many ``real-world'' networks are clearly defined while most ``social'' networks are to some extent subjective. Indeed, the accuracy of empirically-determined social networks is a question of some concern because individuals may have distinct perceptions of what constitutes a social link. One unambiguous type of connection is sexual contact. Here we analyze data on the sexual behavior of a random sample of individuals, and find that the cumulative distributions of the number of sexual partners during the twelve months prior to the survey decays as a power law with similar exponents $\alpha \approx 2.4$ for females and males. The scale-free nature of the web of human sexual contacts suggests that strategic interventions aimed at preventing the spread of sexually-transmitted diseases may be the most efficient approach.

The Web of Human Sexual Contacts

We generated genome-wide data from 69 Europeans who lived between 8,000-3,000 years ago by enriching ancient DNA libraries for a target set of almost 400,000 polymorphisms. Enrichment of these positions decreases the sequencing required for genome-wide ancient DNA analysis by a median of around 250-fold, allowing us to study an order of magnitude more individuals than previous studies and to obtain new insights about the past. We show that the populations of Western and Far Eastern Europe followed opposite trajectories between 8,000-5,000 years ago. At the beginning of the Neolithic period in Europe, ∼8,000-7,000 years ago, closely related groups of early farmers appeared in Germany, Hungary and Spain, different from indigenous hunter-gatherers, whereas Russia was inhabited by a distinctive population of hunter-gatherers with high affinity to a ∼24,000-year-old Siberian. By ∼6,000-5,000 years ago, farmers throughout much of Europe had more hunter-gatherer ancestry than their predecessors, but in Russia, the Yamnaya steppe herders of this time were descended not only from the preceding eastern European hunter-gatherers, but also from a population of Near Eastern ancestry. Western and Eastern Europe came into contact ∼4,500 years ago, as the Late Neolithic Corded Ware people from Germany traced ∼75% of their ancestry to the Yamnaya, documenting a massive migration into the heartland of Europe from its eastern periphery. This steppe ancestry persisted in all sampled central Europeans until at least ∼3,000 years ago, and is ubiquitous in present-day Europeans. These results provide support for a steppe origin of at least some of the Indo-European languages of Europe.

Massive migration from the steppe was a source for Indo-European languages in Europe

This article evaluates theories of the origins of sex differences in human behavior. It reviews the cross-cultural evidence on the behavior of women and men in nonindustrial societies, especially the activities that contribute to the sex-typed division of labor and patriarchy. To explain the cross-cultural findings, the authors consider social constructionism, evolutionary psychology, and their own biosocial theory. Supporting the biosocial analysis, sex differences derive from the interaction between the physical specialization of the sexes, especially female reproductive capacity, and the economic and social structural aspects of societies. This biosocial approach treats the psychological attributes of women and men as emergent given the evolved characteristics of the sexes, their developmental experiences, and their situated activity in society.

/pdf/a-cross-cultural-analysis-of-the-behavior-of-women-and-men-bntqdibaep.pdf

A cross-cultural analysis of the behavior of women and men: implications for the origins of sex differences.

This paper suggests that recent studies of the beginning of the Bronze Age and the growth of a bronze 'industry' have placed too much emphasis on the importance of social ranking and the control of resources by elites. Copper had been in demand for over 2000 years before the beginning of the Bronze Age. What changed at this time was the emergence of a technology that gave access to virtually unlimited copper supplies and contributed to a process of economic growth. Circulating metal took on the role of a proto-currency in certain areas and had a significant effect on local patterns of social organisation. It was not centrally controlled. Eventually, the end of the growth process led to increased competition and warfare. Studies of these processes are illuminated by looking at the circulation of metal and money in medieval Europe and by thinking of the social changes in terms of Douglas's' grid' and 'group' dimensions.

Commodities, Transactions, and Growth in the Central-European Early Bronze Age

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/11F405EB351C8A86020C17A647C1C001/S0033589419000425a.pdf/div-class-title-neolithic-population-crash-in-northwest-europe-associated-with-agricultural-crisis-div.pdf

Neolithic population crash in northwest Europe associated with agricultural crisis

From cultural history to cultural evolution: an archaeological perspective on social information transmission

Mapping Our Ancestors: Phylogenetic Approaches in Anthropology and Prehistory

The analysis of ancient genomes is having a major impact on archaeological interpretations. Yet, the methodological divide between these disciplines is substantial. Fundamentally, there is an urgent need to reconcile archaeological and genetic taxonomies. However, traditional archaeological taxonomies are problematic because they are epistemologically weak and often laden with undue assumptions about past ethnicity and demography—they are a hindrance rather than a help in such a reconciliation. Eisenmann and colleagues have recently tackled this issue, offering a palette of potential solutions that circumvents traditional archaeological culture labels. We welcome renewed attention to nomenclature but take issue with such recent work that favours systems of taxonomic assignment for genomic groups that either do not include archaeological information at all or retain traditional cultural taxonomic categories. While superficially pragmatic, these administrative solutions do not address the substantive issues that the topic raises. We here present the argument that the only analytically viable solution to aligning genetic and cultural nomenclature is to conceptualise material culture as underwritten by a system of information transmission across generations that has similar structural properties to the genetic system of information transmission. This alignment facilitates the use of similar analytical protocols and hence allows for a true parallel analysis. Once culture change is also understood as an evolutionary process, a wealth of analytical methods for reconciling archaeological and genetic clusters becomes available.

/pdf/reconciling-material-cultures-in-archaeology-with-genetic-nj02xkrhq7.pdf

Stephen Shennan

Papers

Commodities, Transactions, and Growth in the Central-European Early Bronze Age

Neolithic population crash in northwest Europe associated with agricultural crisis

From cultural history to cultural evolution: an archaeological perspective on social information transmission

Mapping Our Ancestors: Phylogenetic Approaches in Anthropology and Prehistory

Reconciling material cultures in archaeology with genetic data requires robust cultural evolutionary taxonomies