[FieldTrip] ICA: eeglab and fieldtrip

[Stephen Politzer-Ahles]

Hello Aaron,

This doesn't, answer the rest of your questions, but... In your attached
Fieldtrip image, component 1 does look like a likely blink component to me?



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/


On Mon, Mar 31, 2014 at 11:52 PM, <fieldtrip-request at science.ru.nl> wrote:

>
> Message: 2
> Date: Mon, 31 Mar 2014 14:51:51 -0500
> From: Aaron Hanford <aharown at hotmail.com>
> To: "fieldtrip at science.ru.nl" <fieldtrip at science.ru.nl>
> Subject: [FieldTrip] ICA: eeglab and fieldtrip
> Message-ID: <BLU184-W8ABD13D8D59439530A857A3630 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,I'm resending this with the figures turned into jpgs so it's not
> oversize...anyway, so I'm somewhat new to both fieldtrip and eeglab
> (although much more so to fieldtrip).  I'm trying to figure out the
> following:
> On the exact same dataset, I did the following two things:
> 1) in eeglab, I just chose Tools -> Run ICA with default settings.
> Then, starting over with the original raw data:
> 2) In fieldtrip I ran the following: data =
> eeglab2fieldtrip(EEG,'preprocessing','none');cfg = [];cfg.method =
> 'runica';[comp]=ft_componentanalysis(cfg,data);layout =
> 'C:\Users\aharown\Desktop\fieldtrip-20140126\template\layout\easycapM17.mat';cfg.component
> = [1:31];cfg.layout = layout;ft_topoplotIC(cfg,comp);
> In both cases I then plotted the 2-D component maps, attached.
> So my question is, why are these results so completely different?  The
> fieldtrip results don't look right at all, in that for instance they don't
> obviously identify a blink component (note that in this dataset, there is
> only one electrode placed near the right eye, not the left).  I did this a
> handful of times and got the same sort of big differences.  Am I doing
> something wrong or what?
>
> I actually think the cap file seems incorrect, but I've been assured by my
> PI that it's correct, so .... is there another likely answer?
> Thanks,
> Aaron
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