Dear Jerry,
|Is it possible within SPM99 to plot or otherwise assess the average
|behavior of all significant voxels in a small VOI rather than plotting
|for just a singel selected voxel? I know that the SPM analysis is done
|on a voxel basis, but I would like to be able to easily compare the
|peri-stimulus average intensities of VOIs.
You can use the VOI-extract button in the Results section, then write a
short MATLAB script based on spm_graph.m to average epochs/PSTHs within
and across subjects. It's not too tricky, but it does require some
additional programming. I'm not aware of a feature within the core release
of SPM that allows this to be done directly.
best wishes,
Geraint
-----------------------------------------------------------------
Dr. Geraint Rees
Wellcome Advanced Fellow Lecturer
California Institute of Technology Institute of Neurology
Division of Biology 139-74 University College London
Pasadena 12 Queen Square
California 91125 London WC1N 3BG
voice (626) 395-2880 voice (171) 833-7472
fax (626) 796-8876 fax (171) 813-1420
http://www.klab.caltech.edu/~geraint [log in to unmask]
-----------------------------------------------------------------
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|