[Eeglablist] ICs after channel interpolation?

[Tarik S Bel-Bahar]

Hello Sebastian, hope you find these brief notes below of some use.

When STUDY interpolates channels it interpolates scalp channels, and that
does not directly affect the ICs, though it may bring about problems in
eeglab later.

Usually some scalp channels are dropped before ICA, and then interpolated
after ICA is done already.

Consider this: either stay in ICA space (and stop caring about the scalp
channels),  or  interpolate the channels (and  stop caring about the ICs).
another alternative is to use the ICA for cleaning the data, then rebuild
the data without the artifactual ICs, and then interpolate the scalp
channels if you need to.

If I remember correctly, some parts of EEGLAB stop working when the number
of scalp channels does not match the number of ICs anymore, such as after
interpolating the scalp channels after you've done the ICA with less than
all channels.













On Wed, Nov 11, 2015 at 7:29 AM, Sebastian Grissmann <
sebastian.grissmann at lead.uni-tuebingen.de> wrote:

>
> Hi there,
>
> I´m running ICA before I interpolate channels in a STUDY.
>
> Now I´m wondering what happens with the channel ICs?
>
> Usually I have 1 IC per channel. When I create a study I also
> select ICs based on their r.v. and then interpolate channels.
>
> Does this mean that I have some channels without ICs? Does this
> affect my results / interpretations if I use ICs for clustering later?
>
> Best,
> Sebastian
>
>
> --
> Sebastian Grissmann (Mag. rer. nat)
> PhD student
>
> LEAD Graduate School
> University of Tübingen
> Gartenstrasse 29 (1st floor)
> 72074 Tübingen
> Germany
> Phone  +49 7071 29-73579
>
> www.lead.uni-tuebingen.de
>
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