  To exploit the potential of immersive network analytics for engaging and
effective exploration, we promote the metaphor of "egocentrism", where data
depiction and interaction are adapted to the perspective of the user within a
3D network. Egocentrism has the potential to overcome some of the inherent
downsides of virtual environments, e.g., visual clutter and cyber-sickness. To
investigate the effect of this metaphor on immersive network exploration, we
designed and evaluated interfaces of varying degrees of egocentrism. In a user
study, we evaluated the effect of these interfaces on visual search tasks,
efficiency of network traversal, spatial orientation, as well as
cyber-sickness. Results show that a simple egocentric interface considerably
improves visual search efficiency and navigation performance, yet does not
decrease spatial orientation or increase cyber-sickness. An occlusion-free
Ego-Bubble view of the neighborhood only marginally improves the user's
performance. We tie our findings together in an open online tool for egocentric
network exploration, providing actionable insights on the benefits of the
egocentric network exploration metaphor.
