Clusterplot not highlighting clusters & average layout file

Manish Saggar manish.saggar at GMAIL.COM
Tue May 12 10:16:39 CEST 2009


I have a question regarding clusterplot function. I am doing a
within-subject analysis.
The experimental design that I have is as follows, there are three
conditions C1, C2 and C3. Each condition is of 1 min duration (e.g.
rest with eyes open for 1 min).

Now I am comparing grandaverage of freq representation of a set of
subjects for C2 with C1 etc. FreqStatistics is running just fine
creating significant (<0.025 alpha, for 2-tailed test) clusters
(positive). Now the problem is that when I try to plot the location of
this cluster using clusterplot it doesn't show any highlighted
channels. Any ideas why that is happening?

Another question is that since I am using grandaverages of freq
representation, what should I use for layout file (using BESA sfp file
here). I have individual subject layout files. Currently I am just
giving any file from one of the subjects. Since, I noticed that
FreqStatistics finds a common minimum set of channels and then apply
statistics on it. So do I need to average layout files for the subject
group or is there any other way?

Any help is much appreciated.


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