[Eeglablist] IC maps and time-points

[Tarik S Bel-Bahar]

Hi Magda,
brief notes below that may be useful.
Best wishes.
***********************************************************************

*if you are new to eeglab, taking the time to review the following will
help: the eeglab wiki, tutorials, videos, sample data sets, particulalry
regarding ICA and matlab datastructures of a .set file
*on the wiki and in papers (e.g., Onton & Makeig, 2011) ICA and ICA
computation are explained in detail.
*if you are new to eeglab and matlab, it might be easiest for you to
recompute ICA in eeglab [or stay in the software you used to compute ICA
initially].

*try to see if you can get a clean easy import into other software (e.g.,
brainstorm, mne python).

*if you have advanced matlab skills, you can build a new EEG.structure with
your data, and then have eeglab treat your your data natively. But this is
tricky and requires goog eeglab+matlab knowledge.
Essentially you want to 1) find a clean way to "import into eeglab" or 2)
"build your own way (harder) to work with ICs in eeglab from your own data"

*if you are an advanced user: get your EEG data into matlab. get your ICA
data into matlab. Build your own variables and functions to mimic eeglab
methods to plot the topomaps, timeseries, spectra, and/or ersps for one or
more ICs. use eeglab or other software functions as possible. This path is
not recommended, as it would take time unless one is well-experienced.

*see the eeglab wiki regarding how IC components relate to the EEG, and how
IC spatial and temporal information is sumamrized.

* Open a normal eeglab .set file with ICA in it. Plot the ICA topomaps or
the IC properties. Type eegh to get the code that was run.
Open the functions that were run and read through the code to inform about
how the IC information is dealt with.
***********************************************************************


On Mon, May 18, 2020 at 4:02 AM Magda Gawłowska <mag.gawlowska at gmail.com>
wrote:

> Hi,
> I stepped on a problem I cannot figure out how to solve.
> Basically, I have an IC-decomposed data, however, it was done outside the
> EEGlab. In turn, I have 50 variables - each variable represents one IC and
> has a channels x timepoints structure.
>
> Now - I want to plot IC maps, but I've just realized I have no idea how
> EEGlab does that. I know that EEGlab assigns arbitrary units to the time
> scale while plotting the maps, but how am I supposed to deal with my data?
> Am I supposed to average all the time points? (even for me it sounds highly
> unlikely...).
>
> Can you think of any solution?
>
> Thanks in advance!! :)
>
> Greetings,
> Magda
>
> <
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