Bayesian multi-dipole modelling in the frequency domain

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Gianvittorio Luria
  • Dunja Duran
  • Elisa Visani
  • Sara Sommariva
  • Fabio Rotondi
  • Davide Rossi Sebastiano
  • Ferruccio Panzica
  • Michele Piana
  • Alberto Sorrentino

Research units

  • University of Genoa
  • IRCCS Fondazione Istituto Neurologico Carlo Besta - Milano
  • CNR

Abstract

Background: Magneto- and Electro-encephalography record the electromagnetic field generated by neural currents with high temporal frequency and good spatial resolution, and are therefore well suited for source localization in the time and in the frequency domain. In particular, localization of the generators of neural oscillations is very important in the study of cognitive processes in the healthy and in the pathological brain. New method: We introduce the use of a Bayesian multi-dipole localization method in the frequency domain. Given the Fourier Transform of the data at one or multiple frequencies and/or trials, the algorithm approximates numerically the posterior distribution with Monte Carlo techniques. Results: We use synthetic data to show that the proposed method behaves well under a wide range of experimental conditions, including low signal-to-noise ratios and correlated sources. We use dipole clusters to mimic the effect of extended sources. In addition, we test the algorithm on real MEG data to confirm its feasibility. Comparison with existing method(s): Throughout the whole study, DICS (Dynamic Imaging of Coherent Sources) is used systematically as a benchmark. The two methods provide similar general pictures; the posterior distributions of the Bayesian approach contain much richer information at the price of a higher computational cost. Conclusions: The Bayesian method described in this paper represents a reliable approach for localization of multiple dipoles in the frequency domain.

Details

Original languageEnglish
Pages (from-to)27-36
Number of pages10
JournalJournal of Neuroscience Methods
Volume312
Publication statusPublished - 15 Jan 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Bayesian methods, EEG/MEG, Oscillatory brain activity, Sequential Monte Carlo, Source modelling

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