[Eeglablist] How to plot cluster ERP topo maps at specific latencies

[Makoto Miyakoshi]

Dear James,

If you want to see a time-varying scalp topos of the STUDY ERPs, it's a bit
tricky. They do change scalp top patterns along with latency due to
time-varying ERPs and averaging across ICs.

In the std_envtopo(), the solution is coded. However it should be hard to
figure out how it is addressed and therefore not recommended, though that's
like the only way to address it correctly.

If you haven't tried std_envtopo() I recommend you try it out first.

Makoto


On Mon, Jun 23, 2014 at 10:29 AM, James Jones-Rounds <jj324 at cornell.edu>
wrote:

> Thank you Makoto! However, what I am specifically interested in is the
> topoplot of the cluster ERP..I suppose I will just feed topoplot the
> STUDY.cluster.erp field in as the "datavector", in order to plot what I'm
> after?
>
> Thank you,
>
> James
>
>
>
> On Mon, Jun 23, 2014 at 1:26 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
>> Dear James,
>>
>> The topoplot help says:
>>
>> >>  topoplot(datavector, EEG.chanlocs);   % plot a map using an EEG
>> chanlocs structure
>>
>> This means that if you have EEG.chanlocs (which you must have if you are
>> set up with your channels correctly using EEGLAB) and channel values you
>> can plot scalp topo of whatever kind.
>>
>> For example, let's say you have -1 to 2 sec epoch, sampled at 250 Hz, 64
>> channels, and 100 trials. Your EEG.data should be 64x750x100. If you want
>> to show the scalp topo of the mean ERP between 100 to 250 ms, it can be
>> done by (off the top of my head)
>>
>> topoplot(mean(mean(EEG.data(:,[275:313],:),2),3), EEG.chanlocs)
>>
>> Makoto
>>
>>
>> On Fri, Jun 20, 2014 at 12:18 PM, James Jones-Rounds <jj324 at cornell.edu>
>> wrote:
>>
>>> Hello all,
>>>
>>> I am trying to generate topographic ERP plots (i.e. scalp maps) at just
>>> specific latencies, from my component clusters. The EEGLAB website seems to
>>> say it's not possible:
>>>
>>> I found this on the EEGLAB website (
>>> http://sccn.ucsd.edu/wiki/Chapter_06:_Study_Statistics_and_Visualization_Options
>>> ):
>>> "Finally, for data channels (but not for component clusters) an
>>> additional option is available to plot ERP scalp maps at specific
>>> latencies. "
>>>
>>> Does anyone know how to do this for component cluster ERPs? Thank you in
>>> advance!!
>>>
>>> James
>>>
>>> --
>>> James Jones-Rounds
>>> Laboratory Manager
>>> Human Development EEG and Psychophysiology (HEP) Laboratory,
>>> Department of Human Development,
>>> --------------------------------------------
>>> Cornell University | Ithaca, NY
>>> 607-255-9883
>>> eeg at cornell.edu
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>
>
> --
> James Jones-Rounds
> Laboratory Manager
> Human Development EEG and Psychophysiology (HEP) Laboratory,
> Department of Human Development,
> --------------------------------------------
> Cornell University | Ithaca, NY
> 607-255-9883
> eeg at cornell.edu
>



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