Further results on why a point process is effective for estimating correlation between brain regions

Ignacio Cifre León, M. Zarepour, S. G. Horowitz, S. A. Cannas, D. R. Chialvo

Research output: Indexed journal article Articlepeer-review

13 Citations (Scopus)

Abstract

Signals from brain functional magnetic resonance imaging (fMRI) can be efficiently represented by a sparse spatiotemporal point process, according to a recently introduced heuristic signal processing scheme. This approach has already been validated for relevant conditions, demonstrating that it preserves and compresses a surprisingly large fraction of the signal information. Here we investigated the conditions necessary for such an approach to succeed, as well as the underlying reasons, using real fMRI data and a simulated dataset. The results show that the key lies in the temporal correlation properties of the time series under consideration. It was found that signals with slowly decaying autocorrelations are particularly suitable for this type of compression, where inflection points contain most of the information.

Original languageEnglish
Article number120003
Pages (from-to)1-8
Number of pages8
JournalPapers in Physics
Volume12
DOIs
Publication statusPublished - 2020

Keywords

  • time series
  • point processes
  • functional connectivity
  • resting states
  • dynamics

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