AAU Update

PhD Defense by Mathieu Jacomy

PhD Defense by Mathieu Jacomy

Mathieu Jacomy defends his PhD thesis: Situating Visual Network Analysis


01.06.2021 kl. 13.00 - 15.00



Situating Visual Network Analysis


Visual network analysis (VNA) is the practice of analyzing networks by visual means. In this dissertation, I account for this practice and the techniques involved by focusing on force-directed node placement algorithms, the most popular strategy for drawing network maps. I explore the question of what we see when we look at networks, address some of the criticism faced by network visualization, and reflect on the role of the layout algorithm in the visual mediation of the network’s topological structure. My argument unfolds in six theses: (1) VNA consists of practices that are only partially determined by the graph-drawing and data-visualization literature; (2) some visualizations, including network maps, prompt a visual inquiry into the meaning of emergent patterns as contributing to their apparent self-evidence; (3) for historical reasons, the graph-drawing literature mainly promotes an interpretation regime adapted to small networks (diagrammatic), while practices partially shifted in the 2000s to large networks (topological interpretation regime); (4) some issues with reading network maps can be attributed to the misalignment between our visual cognition and the computational standpoint, notably the notion of the group; (5) the existing justifications of algorithm designers do not provide a compelling explanation of what we see in networks; and (6) the literature on community detection focuses on clear-cut clusters, while force-driven placement algorithms make visible other non-clear-cut community structures.

Assessment committee:

  • Professor Torben Elgaard Jensen, Aalborg University (chair)
  • Professor Brit Ross Winthereik, IT-Universitetet
  • Associate Professor Bernhard Rieder, University of Amsterdam


  • Associate Professor Anders Kristian Munk


  • Anders Koed Madsen


  • Associate Professor Anders Kristian Munk


You can follow the defense online. Registration for the event is mandatory here: https://bit.ly/3uqw6I7




Aalborg University, Department of Culture and Learning



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