[Eeglablist] Compare the head plots

[Arnaud Delorme]

Dear Ming,

> I wonder if somebody have experience on comparing two headplots.  For
> example, one headplot is plotted using average trial data for 1 condition
> (the EEG response of recognizing something) and one headplot is plotted
> using average trial data for the opposite condition (the EEG response of
> not recognizing something).  How can I compare these two and highlight
> their difference?  Can I just do a simple subtraction and use topoplot
> function to plot out the difference?  Any suggestions?

Yes, performing a subtraction sounds like a good solution. If you create 
a study and you have several subjects, EEGLAB can also compute 
parametric and non-parametric statistics on the difference (it is not 
yet able to show the difference though).

Best,

Arno