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Independent Component Analysis Using an Extended Infomax Algorithm for Mixed Subgaussian and Supergaussian Sources (1999)
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BibTeX
@MISC{Lee99independentcomponent,
author = {Te-won Lee and Mark Girolami and Terrence J. Sejnowski},
title = { Independent Component Analysis Using an Extended Infomax Algorithm for Mixed Subgaussian and Supergaussian Sources},
year = {1999}
}
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Abstract
An extension of the infomax algorithm of Bell and Sejnowski (1995) is presented that is able blindly to separate mixed signals with sub- and supergaussian source distributions. This was achieved by using a simple type of learning rule first derived by Girolami (1997) by choosing negentropy as a projection pursuit index. Parameterized probability distributions that have sub- and supergaussian regimes were used to derive a general learning rule that preserves the simple architecture proposed by Bell and Sejnowski (1995), is optimized using the natural gradient by Amari (1998), and uses the stability analysis of Cardoso and Laheld (1996) to switch between sub- and supergaussian regimes. We demonstrate that the extended infomax algorithm is able to separate 20 sources with a variety of source distributions easily. Applied to high-dimensional data from electroencephalographic recordings, it is effective at separating artifacts such as eye blinks and line noise from weaker electrical signals that arise from sources in the brain.
Keyphrases
extended infomax algorithm mixed subgaussian independent component analysis using supergaussian source supergaussian regime source distribution simple type infomax algorithm electroencephalographic recording projection pursuit index high-dimensional data eye blink probability distribution line noise electrical signal general learning rule stability analysis simple architecture mixed signal natural gradient supergaussian source distribution
