[Eeglablist] topo maps of grand averaged data

[Andreas Widmann]

Dear Clayton,

> My question is this: is there an easy way to
> create topo maps from the grand averaged data?
There is a plugin under development offering some basic grand averaging 
functionality. An RC version can be downloaded from
http://www.uni-leipzig.de/~biocog/widmann/eeglab-plugins.shtml.
However, please be aware that this is still work in progress and not 
tested under all situations yet. If you use it, please report back any 
encountered problems or suggestions to the list or to me.

The plugin averages *all* trials per dataset (from disk or from ALLEEG 
structure) and places the average of each dataset as a trial in a new 
EEG structure. Thus, the to be averaged datasets should only contain the 
trial types you want to average (preprocess with pop_selectevent()). All 
EEGLAB plotting functions can then be applied to this new EEG structure. 
  Keeping the average of each dataset as a trial in the grand average 
preserves variance information for statistical testing across 
subjects/conditions.

Best,
Andreas
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