A likelihood ratio test for functional MRI data analysis to account for colored noise

  • Authors:

  • Jan Sijbers;Arnold Jan den Dekker;Robert Bos

  • Affiliations:

  • Vision Lab, University of Antwerp, Antwerpen, Belgium;Delft Center for Systems and Control, Delft University of Technology, Delft, The Netherlands;Delft Center for Systems and Control, Delft University of Technology, Delft, The Netherlands

  • Venue:
  • ACIVS'05 Proceedings of the 7th international conference on Advanced Concepts for Intelligent Vision Systems
  • Year:
  • 2005

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Abstract

Functional magnetic resonance (fMRI) data are often corrupted with colored noise. To account for this type of noise, many pre-whitening and pre-coloring strategies have been proposed to process the fMRI time series prior to statistical inference. In this paper, a generalized likelihood ratio test for brain activation detection is proposed in which the temporal correlation structure of the noise is modelled as an autoregressive (AR) model. The order of the AR model is determined from experimental null data sets. Simulation tests reveal that, for a fixed false alarm rate, the proposed test is slightly (2-3%) better than current tests incorporating colored noise in terms of detection rate.