[Eeglablist] ICA error

[Robert Thatcher]

 Hi Erika,    Did you compare the phase differences between short vs long distance electrode locations, e.g., Frontal-occipital vs local parietal-occipital or central-frontal, etc? before and after ICA reconstruction? Are you only interested in amplitude and not phase differences?
Robert


 between short and long distance electrode locations, for example occipital to central or frontal to parietal 
    On Saturday, January 6, , 4:33:46 PM EST, Erika Nyhus <enyhus at bowdoin.edu> wrote:  
 
 Hi Tarik and Makoto,
All datasets were re-referenced to the average reference and the reference channel was added back to the data so there are 64 channels and no bad channels.  I am selecting 63 channels and excluding the reference channel for ICA.  All the datasets are from the same subject and have been preprocessed in the same way.  I tried running ICA with 64 channels selected and it runs fine.  I tried running ICA with the tutorial dataset and selecting 31 channels and get the same error as in my datasets.
Erika
On Tue, Dec 26, 2017 at 6:22 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:

Dear Erika,
If EEG.icasphere has 63 x 63 columns, it means ICA was computed on 63 channels. How many channels did you have when you run ICA? Was the data full-ranked (no bridging across channels, no standard re-referencing before ICA)?
Makoto
On Wed, Dec 20, 2017 at 8:28 AM, Erika Nyhus <enyhus at bowdoin.edu> wrote:

I am getting the following error when I run ICA on a concatenated datasets and selecting 63 of 64 channels.   When I run ICA on any of the datasets individually I do not get an error.  I was wondering if anyone has run in to this problem and how they were able to solve it.
eeg_checkset error: number of elements in 'icachansind' (64) does not match the number of columns in the sphere array (63)
-- 
Erika Nyhus, Ph.D.
Department of Psychology and Program in Neuroscience6900 College StationBowdoin CollegeBrunswick, ME 04011






-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego




-- 
Erika Nyhus, Ph.D.
Department of Psychology and Program in Neuroscience6900 College StationBowdoin CollegeBrunswick, ME 04011


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