[Eeglablist] ICA and phase
georges.otte at pandora.be
Sat Nov 1 10:43:02 PDT 2014
If we reject some artefacts in eeg recordings by zeroing their components
and then reconstruct the "original" EEG by multiplying the rest of the
components matrix with the inverted unmixing matrix, the time points of the
"reconstructed" eeg are a weighted linear interpolation and hence there will
be changes in phase angle between channels.
This is a topic that is rarely mentioned in ICA literature although some
simulation studies have been done (Montefusco at al)
that the phase distortion is largest at the origin of the artefact (due to
weighting coefficients) and within its frequency range , yet the effect is
Is there a way, a strategy, a method , when using ICA for rejecting EEG
artefacts , to avoid this phase distortion problem ?
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