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Cultural Macroevolution Matters COLLOQUIUM PAPER Cultural macroevolution matters COLLOQUIUM Russell D. Graya,b,c,1 and Joseph Wattsa,d aDepartment of Linguistic and Cultural Evolution, Max Planck Institute for the Science of Human History, Jena D-07745, Germany; bSchool of Psychology, University of Auckland, Auckland 1142, New Zealand; cResearch School of the Social Sciences, Australian National University, Canberra, ACT 2601, Australia; and dDepartment of Experimental Psychology, University of Oxford, Oxford OX1 3PH, United Kingdom Edited by Andrew Whiten, University of St. Andrews, St. Andrews, United Kingdom, and accepted by Editorial Board Member Andrew G. Clark May 29, 2017 (received for review January 16, 2017) Evolutionary thinking can be applied to both cultural microevolu- the importance of studying cultural macroevolution. Although we tion and macroevolution. However, much of the current literature completely understand the need for elegant empirical work and focuses on cultural microevolution. In this article, we argue that appropriate models of cultural change within populations, we the growing availability of large cross-cultural datasets facilitates should never forget that the large-scale patterns of diversity be- the use of computational methods derived from evolutionary tween cultures also cry out for evolutionary analyses and expla- biology to answer broad-scale questions about the major transi- nation. The macro really matters. tions in human social organization. Biological methods can be extended to human cultural evolution. We illustrate this argument Big(ish) Data and Need for Computational Methods with examples drawn from our recent work on the roles of Big It is a cliché these days to talk about big data transforming the Gods and ritual human sacrifice in the evolution of large, stratified social sciences. However, clichés can be true. Certainly, there are societies. These analyses show that, although the presence of Big a growing number of global comparative cultural and linguistic Gods is correlated with the evolution of political complexity, in databases, such as D-PLACE (2), DRH (7), WALS (8), ASJP Austronesian cultures at least, they do not play a causal role in (9), and Phoible (10), as well as relatively large regional data- ratcheting up political complexity. In contrast, ritual human bases, such as the Austronesian Basic Vocabulary Database (11), sacrifice does play a causal role in promoting and sustaining the SAILS (12), Chirilla (13), and Pulotu (14). Although these da- evolution of stratified societies by maintaining and legitimizing tabases might not technically qualify as “big data,” they are large the power of elites. We briefly discuss some common objections to enough to afford the application of the type of sophisticated the application of phylogenetic modeling to cultural evolution and computational methods that are often used in the biological ANTHROPOLOGY argue that the use of these methods does not require a commit- sciences such as network analysis of reticulate evolution, epide- ment to either gene-like cultural inheritance or to the view that miological models, and phylogenetic comparative methods. cultures are like vertebrate species. We conclude that the careful These methods can be used to compare the relative importance application of these methods can substantially enhance the of different factors in the distribution of traits, model the un- prospects of an evolutionary science of human history. derlying dynamics of evolutionary change, and infer the history of traits. The combination of big(ish) data and computational cultural evolution | macroevolution | phylogenetics | religion | Big Gods methods has the potential to transform the social sciences and EVOLUTION humanities by enabling powerful quantitative tests of hypotheses arwin’s On the Origin of the Species ends with the poetic that would have previously only been analyzable in much more Dphrase, “From so simple a beginning endless forms most limited ways. beautiful and most wonderful have been, and are being, evolved” To illustrate the promise of this approach, we present a recent (1). The central challenge for evolutionary biology is to explain study by Botero et al. (15) titled, “The Ecology of Religious Be- this diversity of endless forms. Evolutionary biologists tackle this liefs,” in which the authors examined the global distribution of task by studying both microevolution (changes in gene frequency moralizing high gods (MHGs)—supernatural beings who are within a population) and macroevolution (changes between claimed to have created or govern all reality, intervene in human species over much longer time periods). The aim is to have a affairs, and enforce or support human morality (sometimes re- mechanistic understanding of the evolution of biological diversity ferred to as “Big Gods”). These gods are central to the Abrahamic that integrates microlevel processes and macrolevel patterns. religions, which includes the two largest religious families in the This work examines ways in which evolutionary thinking and world today, Christianity and Islam. Scholars have debated the methods can be extended into the realm of culture, extending the social and physical environments in which MHGs most readily scope of biology to include questions that have traditionally been spread, and previous studies found rather contradictory results, restricted to the humanities and social sciences. Human cultures with resource scarcity both positively and negatively associated also display a vast variety of most beautiful and most wonderful with a belief in a MHG (16–18). These studies were limited by forms. We speak ∼7,000 different languages, engage in hundreds the use of crude metrics of ecology or indirect measures of of different religious practices, build many different types of houses, exploit different resources for subsistence, use numerous different kinship systems, and abide by a striking array of marital, This paper results from the Arthur M. Sackler Colloquium of the National Academy of sexual, and child-rearing norms (2). The cultural processes that Sciences, “The Extension of Biology Through Culture,” held November 16–17, 2016, at the produce such striking cultural diversity must be explained. The Arnold and Mabel Beckman Center of the National Academies of Sciences and Engineering field of cultural evolution is currently beginning to blossom (Fig. in Irvine, CA. The complete program and video recordings of most presentations are available on the NAS website at www.nasonline.org/Extension_of_Biology_Through_Culture. 1). There is a new cultural evolution society, a proposed journal, Author contributions: R.D.G. and J.W. designed research, performed research, analyzed and an inaugural conference (3). However, with a few notable data, and wrote the paper. exceptions (4), much of the current work on cultural evolution The authors declare no conflict of interest. focuses on microevolutionary processes. For example, in Dan ’ This article is a PNAS Direct Submission. A.W. is a guest editor invited by the Editorial Sperber s influential book Explaining Culture: A Naturalistic Ap- Board. proach (5), cultural macroevolution rates only a passing mention Data deposition: The data reported in this paper have been deposited in the D-PLACE on p. 2. More recently, in Lewens’ (6) otherwise masterful anal- (https://d-place.org/home), Pulotu (https://pulotu.shh.mpg.de), and ABVD (https://abvd. ysis of current work on cultural evolution, macroevolutionary shh.mpg.de/austronesian/) databases. phenomena again fail to feature. This article is a plea—apleafor 1To whom correspondence should be addressed. Email: [email protected]. www.pnas.org/cgi/doi/10.1073/pnas.1620746114 PNAS Early Edition | 1of7 Downloaded by guest on September 28, 2021 By themselves, large cross-cultural datasets and sophisticated computational methods are insufficient to create an exciting macroevolutionary science of human history. What is needed are big hypotheses and a powerful synthetic framework. We would like to suggest that much of the evolutionary thinking behind The Major Transitions in Evolution could be applied to cultural macroevolution (23). Ten thousand years ago, most humans lived in small, kin- based, and relatively egalitarian groups (26). Today, we live in colossal nation states with distantly related members, complex hierarchical organization, and huge social inequality. Although kin selection and reciprocity explain a great deal of cooperation in the animal kingdom, these mechanisms break down in modern Percentage of search results of search Percentage societies because the sheer scale of modern societies means that 0.5 1.0 1.5 2.0 2.5 people can be anonymous and only distantly biologically related (27). The challenge is to explain the cultural forces that enabled 1950 1960 1970 1980 1990 2000 2010 this major transition in the size and complexity of human social Year groups to occur. The potential of religious beliefs and practices to bind to- Fig. 1. Percentage of Google Scholar search results containing the term gether social groups has long been recognized (28), although “cultural evolution” from 1950 to 2010. these functions have only recently been considered from an ex- plicitly evolutionary perspective (29–31). One prominent theory is that belief in supernatural punishment, particularly by pow- agricultural potential, relatively small sample sizes, and a failure erful and omnipotent Big Gods, inhibits selfishness and increases to account for the nonindependence of societies as a result
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