[Eeglablist] topo maps of grand averaged data
hinnesbrown at gmail.com
Thu Feb 23 14:47:25 PST 2006
The way I did this a while ago (possibly not the BEST way) was to
load all my subject averages for a given condition into the EEG
I did this pretty simply like this:
% script for plotting the tones and word averages quite nicely.
% first load them all in
path = 'c:\_CAPAH\avg\';
for i = 1:size(wordsList,1)
wavg(:,:,i) = loadavg(wordsList(i).name);
for i = 1:size(tonesList,1)
tavg(:,:,i) = loadavg(tonesList(i).name);
In tis case I searched the directory for all *W.avg files and *T.avg
files and loaded them into separate matrices using the EEGLAB
Then you go into the File -> Import data -> From ASCI or matlab array
and type the name of your matrix into the field and off you go. You
will probably want to load a standard electrode locations file as
well if you want to use topoplot.
It might be worth keeping in mind that you're putting avgerage data
into a structure that was always meant to contain single-trials, and
so you wouldn't want to do anything much apart from plot the data
using this method. I'm not sure, but I imagine if you were to run
ICA on this the output might not be what you expect. I haven't
really thought about that though.
On 23/02/2006, at 12:40 PM, Clayton Hickey wrote:
> Hello Everyone,
> I have a potentially simple question regarding grand averaging...
> I'm in the relatively late stages of analyzing a dataset and have
> created grand averaged waveforms. My question is this: is there an
> easy way to create topo maps from the grand averaged data?
> Currently I am creating an empty EEG structure, 'manually'
> averaging the datasets, and placing this into the empty
> structure... this entails copying a lot of other variables, and all
> in all is a bit of a hassle. As eeglab has in general a high-level
> of functionality, I've got a feeling I'm missing something...
> thanks in advance for any suggestions,
> Clayton Hickey
> Human Electrophysiology Lab
> Simon Fraser University
> Vancouver, Canada
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