View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by UCL Discovery Accepted for publication in Journal of Complex Networks on 3rd May 2017 DOI: 10.1093/comnet/cnx013 Community structure of copper supply networks in the prehistoric Balkans: An independent evaluation of the archaeological record from the 7th to the 4th millennium BC M. Radivojević* 1McDonald Institute for Archaeological Research, University of Cambridge, Downing Street, CB2 3ER Cambridge, UK *Corresponding author:
[email protected] J. Grujić* 2Vrije University Brussels, Artificial Intelligence Lab, Pleinlaan 2, Building G, 10th floor & MLG, Département d'Informatique, Université libre de Bruxelles, 1050 Brussels, Belgium *Corresponding author:
[email protected] Complex networks analyses of many physical, biological and social phenomena show remarkable structural regularities [1-3], yet, their application in studying human past interaction remains underdeveloped. Here, we present an innovative method for identifying community structures in the archaeological record that allow for independent evaluation of the copper using societies in the Balkans, from c. 6200 to c. 3200 BC. We achieve this by exploring modularity of networked systems of these societies across an estimated 3000 years. We employ chemical data of copper-based objects from 79 archaeological sites as the independent variable for detecting most densely interconnected sets of nodes with a modularity maximization method [4]. Our results reveal three dominant modular structures across the entire period, which exhibit strong spatial and temporal significance. We interpret patterns of copper supply among prehistoric societies as reflective of social relations, which emerge as equally important as physical proximity.