[Eeglablist] ICA question

[Tarik S Bel-Bahar]

See recent muscle Ica articles from alex shackman from Richard Davidson's
group at wisconsin. See previous eeglab posts on same topics.
On Feb 1, 2012 11:38 AM, "Enrico Schulz" <enrico.schulz at gmail.com> wrote:

> Dear EEGlab list,
>
> I have a problem with the ICA-based artefact reduction that is actually
> not just restricted to the EEGlab software.
>
> I'm struggling with a lot of high frequency- artefacts at frontal and
> inferior electrodes around the head exhibiting a much higher amplitude than
> the cortical gamma band activity I'm interested in. Although it is
> possible to remove the strongest artefacts, some muscle activity could not
> be removed in my data sets because some of the artefacts do not give rise
> to a separate component.
>
> In my naive view, in addition to the fact that there are still artefacts
> in the data set, this could lead to a bias for some subjects. In theory, if
> a strong artefact gives rise to an independent component and can, hence, be
> removed, the amount of artefacts in that data set is now lower than in a
> different data set, where that artefact is not strong enough for a distinct
> component.
>
> The problem is even more complicated if an experimental group (e.g. pain
> patients) has stronger muscle artefacts than a healthy control group.
>
> Sorry for the long introduction, but my actual question is, whether it is
> possible to concatenate all single subject files and doing the ICA for that
> big file.
> I'm aware that this approach has other disadvantages, e.g. it requires a
> similar topography for each artefact across all subjects and a fast
> machine.
>
> Any help/opinion is highly appreciated!
>
> Best regards,
> Enrico
>
>
>
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