[Eeglablist] Topography plot in component clusters

[Makoto Miyakoshi]

Dear Shingo,

Ok here is a solution for you based on my guess.

> Is it impossible to plot topographies of two experimental conditions for
a component cluster as we can do in channel pot (for a time-window)?

I guess you mean 'to plot *difference* topographies of two experimental
conditions for a component cluster'. The instruction below is based on this
assumption.

Case 1: The conditions are all within-subject and with the continuous use
of an EEG cap.
Unless each within-subject condition is recorded on different sessions
(i.e. apply the EEG cap for one session, remove it, and applied it newly
for the next session), independent components should be shared across the
conditions. If this is the case, then difference topography is all zero.
Therefore, *you can't get difference topographies*.

Case 2:  The conditions are between-subject (or within-subject but
different sessions with different EEG cap application). If this is the
case, subtraction of IC scalp maps makes sense.

How to do it:

1. Load your STUDY with group differences (i.e. Case 2 mentioned above)

2. Use my plugin std_envtopo and show whatever envtopo. This is to generate
topoall_group under STUDY.cluster(1,X) It looks like this

topoall_group: {{1x14 cell}  {1x17 cell}}

3. To visualize Group A and Group B in Cluster 5, see my code and result
example below
https://drive.google.com/open?id=0BzTEovh4TOLiflAwREdrZmxsUTBfVFdjR3AyS0pOV3JONEEtTHpwdndwLU9mVXg3cHlITHc&authuser=0

Let me know if you have any trouble in accessing my Google drive.

Makoto





On Tue, May 5, 2015 at 1:23 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Shingo,
>
> I don't think it's possible.
> scalp topo generation is relatively straightforward using pop_topoplot()
> function. I can help you to do this if you are interested in.
>
> Makoto
>
> On Thu, Apr 30, 2015 at 3:24 PM, Shingo Tokimoto <tokimoto at mejiro.ac.jp>
> wrote:
>
>> Dear EEGLAB experts,
>>
>> Is it impossible to plot topographies of two experimental conditions for
>> a component cluster as we can do in channel pot (for a time-window)? Thank
>> you in advance.
>>
>> ************************************************
>> Shingo Tokimoto, Ph.D.
>> in Linguistics and Psychology
>> Department of Foreign Languages
>> Mejiro University
>> 4-31-1, Naka-Ochiai, Shinjuku, Tokyo,
>> 161-8539, Japan
>> tokimoto at mejiro.ac.jp
>> ************************************************
>>
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



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