Continuous Time Particle Filtering for fMRI

Lawrence Murray, Amos J. Storkey

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We construct a biologically motivated stochastic differential model of the neural and hemodynamic activity underlying the observed Blood Oxygen Level Dependent (BOLD) signal in Functional Magnetic Resonance Imaging (fMRI). The model poses a difficult parameter estimation problem, both theoretically due to the nonlinearity and divergence of the differential system, and computationally due to its time and space complexity. We adapt a particle filter and smoother to the task, and discuss some of the practical approaches used to tackle the difficulties, including use of sparse matrices and parallelisation. Results demonstrate the tractability of the approach in its application to an effective connectivity study.
Original languageEnglish
Title of host publicationAdvances in Neural Information Processing Systems 20
EditorsJ.C. Platt, D. Koller, Y. Singer, S. Roweis
Place of PublicationCambridge, MA
PublisherMIT Press
Pages1049-1056
Number of pages8
Publication statusPublished - 2007

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