[Eeglablist] Plotting ERSP scalp maps in STUDY

[Arnaud Delorme]

Dear Pete,

the problem with your code is that you did not use the 'interp' option to interpolate scalp channels. When you do not do so, sometimes channels are missing in some conditions only and there are some modes in which they cannot be plotted.

Best,

Arno

On 20 Sep 2012, at 16:48, Makoto Miyakoshi wrote:

> Dear Pete,
> 
> I experienced with similar problem that EEGLAB study function
> complains about channel location or something. Please check your
> EEGLAB version, and if it is latest or around, try older versions. It
> worked for me. We would appreciate if you are kind enough to report it
> to our bugzilla.
> 
> Makoto
> 
> 2012/9/18 Pete Manza <pete.manza at gmail.com>:
>> Hi all,
>> 
>> I have 64-channel data in a STUDY design -- when I've precomputed ERSP
>> values via the GUI, I have no problem plotting the scalp maps for all
>> electrodes.  Recently, I precomputed the values with this code:
>> 
>> [STUDY, ALLEEG] = std_checkset(STUDY, ALLEEG);
>> [STUDY ALLEEG] = std_precomp(STUDY, ALLEEG,
>> {},'allcomps','on','recompute','on','ersp','on', 'erspparams', {'cycles' [3
>> 0.5] 'baseline' -5100 'freqscale' 'linear' 'tlimits' [-5300 2000] 'timesout'
>> 600 'freqs' [3 30] 'nfreqs' 56 },'itc','on')
>> 
>> The ERSP maps for individual electrodes come out fine -- but when I try to
>> plot the scalp map with all 64 electrodes, I get the following error:
>> 
>> Reading all ERSP data:Warning: Channel "cp4" and maybe others was not
>> found in pre-computed data file
>>> In std_chaninds at 54
>>  In std_readfile at 134
>>  In std_readersp at 214
>>  In std_erspplot at 180
>>  In pop_chanplot at 303
>>  In inputgui at 182
>>  In pop_chanplot at 269
>> ??? In an assignment  A(:) = B, the number of elements in A and B
>> must be the same.
>> 
>> 
>> 
>> 
>> When I try to plot electrodes like CP4 individually, it works just fine --
>> but when I try to do the scalp map, it seems that several electrodes are not
>> reading properly.  I can plot a few electrodes (I tried plotting 5
>> posterior-central electrodes and the localized map came out fine), but it
>> seems several electrodes aren't reading.  What am I missing?
>> Thanks so much,
>> Pete
>> 
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> 
> 
> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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