Tracing network evolution using the parafac2 model

Marie Roald, Suchita Bhinge, Chunying Jia, Vince Calhoun, Tülay Adalı, Evrim Acar

Research output: Contribution to journalArticlepeer-review

Abstract

Characterizing time-evolving networks is a challenging task, but it is crucial for understanding the dynamic behavior of complex systems such as the brain. For instance, how spatial networks of functional connectivity in the brain evolve during a task is not well-understood. A traditional approach in neuroimaging data analysis is to make simplifications through the assumption of static spatial networks. In this paper, without assuming static networks in time and/or space, we arrange the temporal data as a higher-order tensor and use a tensor factorization model called PARAFAC2 to capture underlying patterns (spatial networks) in time-evolving data and their evolution. Numerical experiments on simulated data demonstrate that PARAFAC2 can successfully reveal the underlying networks and their dynamics. We also show the promising performance of the model in terms of tracing the evolution of task-related functional connectivity in the brain through the analysis of functional magnetic resonance imaging data.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Oct 23 2019
Externally publishedYes

Keywords

  • Dynamic networks
  • Network evolution
  • PARAFAC2
  • Tensor factorizations
  • Time-evolving data

ASJC Scopus subject areas

  • General

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