[Eeglablist] Plotting ERSP with Merged Channels

[Makoto Miyakoshi]

Dear Julie,

> I would like to investigate significant differences between my two
conditions of interest when FC1,FC2, and C2 are merged together

Merged? Do you mean averaged? If so, do you want to do it after computing
ERSP, or do you want to concatenate the three time series?

Anyway, I have never heard of concatenating channels in that way is
supported by the current EEGLAB. You may be able to average ERSP of FC1,
FC2, and C2, but you still need to write code to do it.

Makoto



On Thu, Oct 27, 2016 at 9:38 AM, Schneider, Julie <jxs114631 at utdallas.edu>
wrote:

> Greetings,
>
>
> Using the EEGlab toolbox, I have created a study and can plot the ERSP for
> an individual electrode, but cannot plot the average of multiple channels.
> Specifically, I would like to investigate significant differences between
> my two conditions of interest when FC1,FC2, and C2 are merged together. In
> attempting to solve this problem, I found a previous inquiry on the eeglab
> listserv:
>
> https://sccn.ucsd.edu/pipermail/eeglablist/2011/004188.html.
>
>
> I have successfully been able to follow a portion of Arno's response ["*erspdata
> may then contain data of size (5 elecs x 12 subjects) for example when
> plotting scalp topographies. **You may then average the first dimension*"];
> however, I have not been able to successfully " *replot the result"*. The
> clear issue being that the new variable created by averaging this dimension
> [which is actually the third dimension in my data, and is executed using
> M=mean(my cell array, 3)] can not be plotted using std_erspplot because it
> is not a variable within the study. Other methods of plotting, such as
> image, imagesec, ft_plot_topo, and various attempts through the Fieldtrip
> toolbox, have proven unsuccessful.
>
>
> Any additional information on how I may plot these merged channel files
> would be greatly appreciated. Further, the eeglablist question to which I
> am referencing was posted circa 2011, and I would imagine there may be
> newer methods/plug-ins that allow for this analysis to be conducted. Any
> recommendations that follow another methodology are welcomed and
> appreciated!
>
>
> Best Regards,
>
> Julie
>
>
> Julie M. Schneider, M.S.
>
> Doctoral Student
>
> The Developmental Neurolinguistics Lab
>
> Brain and Behavioral Sciences, University of Texas at Dallas
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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