[Eeglablist] interpolate previously deleted channels

[Gorka FG]

Hi Jumana,

Thanks for your answer. I decided to remove the electrodes before
performing ICA, but that is another discussion.

greetings and thanks gain

On 8 February 2017 at 23:33, Ahmad, Jumana <jumana.ahmad at kcl.ac.uk> wrote:

>
> Hi Gorka,
> You can load an old eeg dataset with the channels present and interpolate
> that way. See Makoto's preprocessing pipeline for an example.
> I try not to delete until I interpolate to avoid the issue.
> Best wishes,
> Jumana
> ------------------------------------------
> Jumana Ahmad
> Post-Doctoral Research Worker in Cognitive Neuroscience
> EU-AIMS Longitudinal European Autism Project (LEAP) & SynaG Study
> Room M1.26.Department of Forensic and Neurodevelopmental Sciences (PO 23)
> | Institute of Psychiatry, Psychology & Neuroscience | King’s College
> London | 16 De Crespigny Park | London SE5 8AF
>
> Phone: 0207 848 5359| Email: jumana.ahmad at kcl.ac.uk | Website:
> www.eu-aims.eu | Facebook: www.facebook.com/euaims
>
> ------------------------------
> *From:* eeglablist-bounces at sccn.ucsd.edu <eeglablist-bounces at sccn.ucsd.edu>
> on behalf of Gorka FG <gorkafraga at gmail.com>
> *Sent:* 07 February 2017 02:24:28
> *To:* eeglablist at sccn.ucsd.edu
> *Subject:* [Eeglablist] interpolate previously deleted channels
>
> Dear all,
>
> I have a dataset in which bad channels were manually removed using  EEG =
> pop_select (EEG, 'channel', *chans2keep*). In later steps, I was unable
> to interpolate those removed channels so I did a workaround inserting blank
> channels and then interpolating (see below).
> Would this approach be correct? am I missing a more simple way of doing
> this using pop_interp?
>
> Thanks in advance for the help!
> Gorka
>
> *--*
> %insert blank channels using *insertrows*  ( http://nl.
> mathworks.com/matlabcentral/fileexchange/9984-insertrows-a-b-ind-
> <https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fnl.mathworks.com%2Fmatlabcentral%2Ffileexchange%2F9984-insertrows-a-b-ind-&data=01%7C01%7Cjumana.ahmad%40kcl.ac.uk%7Cf0ecdf1896304cae3e3408d450510fcd%7C8370cf1416f34c16b83c724071654356%7C0&sdata=%2FpE5QPm5UvY2r3dGdaxgYnXkZecjg%2FJTi3igN43%2BzZc%3D&reserved=0>)
>  in each trial:
>        for trial = 1:size(EEG.data,3); % loop thru trials
>             tmp= EEG.data(:,:,trial);
>               for c = 1:length(chans2interpNum); % loop thru indexes of
> channels to interpolate
>                   tmp= insertrows(tmp,zeros(1,size(
> EEG.data,2))],chans2interpNum(c)-1); %insert a row of zeros at chan index
> position
>               end
>             newEEG(:,:,trial) = tmp;
>             clear tmp
>        end
>        EEG.data = newEEG;
> %interpolate:
>        EEG = eeg_checkset(EEG);
>         EEG = pop_chanedit(EEG,'load',chanlocsfile,'besa');
>            for c = 1:length(chans2interp);
>                EEG =pop_interp(EEG,chans2interpNum(c), 'spherical');
>            end
>          EEG = eeg_checkset(EEG);
>
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