Complex ICA for FMRI analysis: Performance of several approaches

V. Calhoun, T. Adali

Research output: Contribution to journalConference articlepeer-review

Abstract

Independent component analysis (ICA) for separating complex-valued sources is needed for convolutive source-separation in the frequency domain, or for performing source separation on complex-valued data, such as functional magnetic resonance imaging data. Functional magnetic resonance imaging (fMRI) is a technique that produces complex-valued data; however the vast majority of fMRI analyses utilize only magnitude images. We compare the performance of the complex infomax algorithm that uses an analytic (and hence unbounded) nonlinearity with the traditional complex infomax approaches that employ bounded (and hence non-analytic) nonlinearities as well as with a cumulant-based approach. We compare the performances of these algorithms for processing both simulated and real fMRI data and show that the complex infomax using analytic nonlinearity has the ability to separate both sub- and super-Gaussian sources with a hyperbolic tangent nonlinearity. The complex infomax algorithm that uses analytic nonlinearity thus provides a potentially powerful method for exploratory analysis of fMRI data.

Original languageEnglish (US)
Pages (from-to)717-720
Number of pages4
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume2
StatePublished - Sep 25 2003
Externally publishedYes
Event2003 IEEE International Conference on Accoustics, Speech, and Signal Processing - Hong Kong, Hong Kong
Duration: Apr 6 2003Apr 10 2003

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

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