title: Integrating Visualizations into Modeling NEST Simulations.
abstract: Modeling large-scale spiking neural networks showing realistic biological behavior in their dynamics is a complex and tedious task. Since these networks consist of millions of interconnected neurons, their simulation produces an immense amount of data. In recent years it has become possible to simulate even larger networks. However, solutions to assist researchers in understanding the simulation's complex emergent behavior by means of visualization are still lacking. While developing tools to partially fill this gap, we encountered the challenge to integrate these tools easily into the neuroscientists' daily workflow. To understand what makes this so challenging, we looked into the workflows of our collaborators and analyzed how they use the visualizations to solve their daily problems. We identified two major issues: first, the analysis process can rapidly change focus which requires to switch the visualization tool that assists in the current problem domain. Second, because of the heterogeneous data that results from simulations, researchers want to relate data to investigate these effectively. Since a monolithic application model, processing and visualizing all data modalities and reflecting all combinations of possible workflows in a holistic way, is most likely impossible to develop and to maintain, a software architecture that offers specialized visualization tools that run simultaneously and can be linked together to reflect the current workflow, is a more feasible approach. To this end, we have developed a software architecture that allows neuroscientists to integrate visualization tools more closely into the modeling tasks. In addition, it forms the basis for semantic linking of different visualizations to reflect the current workflow. In this paper, we present this architecture and substantiate the usefulness of our approach by common use cases we encountered in our collaborative work.
authors.affiliation: Visual Computing Institute, RWTH Aachen University, Jülich Aachen Research Alliance - High-Performance Computing Aachen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Nowke
authors.affiliation: Visual Computing Institute, RWTH Aachen University, Jülich Aachen Research Alliance - High-Performance Computing Aachen, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Zielasko
authors.affiliation: Visual Computing Institute, RWTH Aachen University, Jülich Aachen Research Alliance - High-Performance Computing Aachen, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Weyers
authors.affiliation: Simulation Lab Neuroscience - Bernstein Facility for Simulation and Database Technology, Institute for Advanced Simulation, Jülich Aachen Research Alliance, Forschungszentrum Jülich GmbH Jülich, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Peyser
authors.affiliation: Visual Computing Institute, RWTH Aachen University, Jülich Aachen Research Alliance - High-Performance Computing Aachen, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Hentschel
authors.affiliation: Visual Computing Institute, RWTH Aachen University, Jülich Aachen Research Alliance - High-Performance Computing Aachen, Germany.
authors.forename: Torsten W
authors.initials: TW
authors.lastname: Kuhlen
keywords: coordinated and multiple views; data management; interactive visualization; spiking neural network modeling; workflow integration