[Eeglablist] Question regarding use of interpolation function

[Stephen Politzer-Ahles]

Hi Melissa,

I just skimmed the documentation for
https://sccn.ucsd.edu/svn/software/eeglab/functions/popfunc/eeg_interp.mand
https://sccn.ucsd.edu/svn/software/eeglab/functions/popfunc/pop_interp.mand
it looks like they're more or less the same (at least as far as inputs
and outputs go), as far as I can tell. pop_interp() is newer. pop_interp()
calls eeg_interp(). You could try doing the interpolation both ways and see
if there is any difference in the output.

Best,
Steve

On Thu, Apr 5, 2012 at 1:46 PM, Tsuboyama, Melissa <
mtsuboyama at urmc.rochester.edu> wrote:

>  Thanks Steve.  I ended up using a command, though it was:
> EEG = pop_interp(EEG, eeg_mergelocs(ALLEEG.chanlocs), 'spherical'); Do you
> know what the difference is between this and what you get using the command
> line you mentioned?
>
> Melissa
>
>  ------------------------------
> *From:* Stephen Politzer-Ahles [politzerahless at gmail.com]
> *Sent:* Wednesday, April 04, 2012 2:57 PM
> *To:* Tsuboyama, Melissa
> *Cc:* eeglablist at sccn.ucsd.edu
> *Subject:* Re: [Eeglablist] Question regarding use of interpolation
> function
>
>  Hi Melissa,
>
> I generally interpolate using the eeg_interp() command, so I'm not
> familiar with the GUI version. To use it from the command line, just load
> up your data and make sure it's the active dataset, then at the command
> line type:
>
> EEG = eeg_interp( EEG, [channels] )
>
> where [channels] is a list of one or more bad channel numbers to
> interpolate.
> Then, save the dataset again.
>
> Best,
> Steve Politzer-Ahles
>
> On Wed, Apr 4, 2012 at 11:01 AM, Tsuboyama, Melissa <
> mtsuboyama at urmc.rochester.edu> wrote:
>
>>    Hello,
>>
>>  I am very new at using eeglab.m. I have been having difficulty
>> interpolating the data from each of my datasets (being performed one
>> dataset at a time) for the bad channel I have removed.  I have already
>> performed low and high pass filters (not simultaneously), removed large
>> artifacts and ran ICA twice (with the second time being after rejecting
>> some data but not removing components).
>>
>> I have been trying to use the "Interpolate electrodes" automated function
>> from the "Tools" menu.  I loaded the original EEG data file and removed
>> VEOG and HEOG and put in appropriate channel locations.  This was my
>> second, reference dataset.  When prompted, I click on "Use list of other
>> dataset" which then prompts me to enter "dataset index".  I am not sure to
>> what this is referring.  Is this the bad channel (using the second dataset
>> as the reference) that I would like to be interpolated around/for?  What is
>> the format I need to use to input the dataset index?
>>
>> Thanks!
>>
>> Melissa
>>
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>
>
>
> --
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
>



-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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