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

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Jun 23 10:26:13 PDT 2014

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)


On Fri, Jun 20, 2014 at 12:18 PM, James Jones-Rounds <jj324 at cornell.edu>

> 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
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