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Neuronal network models and corresponding computer simulations are invaluabletools to aid the interpretation of the relationship between neuron properties,connectivity and measured activity in cortical tissue. Spatiotemporal patternsof activity propagating across the cortical surface as observed experimentallycan for example be described by neuronal network models with layered geometryand distance-dependent connectivity. The interpretation of the resulting streamof multi-modal and multi-dimensional simulation data calls for integratinginteractive visualization steps into existing simulation-analysis workflows.Here, we present a set of interactive visualization concepts called views forthe visual analysis of activity data in topological network models, and acorresponding reference implementation VIOLA (VIsualization Of Layer Activity).The software is a lightweight, open-source, web-based and platform-independentapplication combining and adapting modern interactive visualization paradigms,such as coordinated multiple views, for massively parallel neurophysiologicaldata. For a use-case demonstration we consider spiking activity data of atwo-population, layered point-neuron network model subject to a spatiallyconfined excitation originating from an external population. With the multiplecoordinated views, an explorative and qualitative assessment of thespatiotemporal features of neuronal activity can be performed upfront of adetailed quantitative data analysis of specific aspects of the data.Furthermore, ongoing efforts including the European Human Brain Project aim atproviding online user portals for integrated model development, simulation,analysis and provenance tracking, wherein interactive visual analysis tools areone component. Browser-compatible, web-technology based solutions are thereforerequired. Within this scope, with VIOLA we provide a first prototype.

VIOLA - A multi-purpose and web-based visualization tool for neuronal-network simulation output