I'd actually love to get the same set of instructions if anyone was
planning on replying to Nathan directly.
Thanks, Matt
Begin forwarded message:
0000,0000,0000From:
Nathan Klimenko <<[log in to unmask]>
0000,0000,0000Date: March
29, 2005 10:11:33 AM PST
0000,0000,0000To:
[log in to unmask]
0000,0000,0000Subject: [SPM]
subtraction analysis
0000,0000,0000Reply-To: Nathan
Klimenko <<[log in to unmask]>
Dear List,
I would like to do a simple subtraction analysis using the spatially
normalized images from two groups.
Using Imcalc, I got the average-images of the two groups and
substracted
them to get the activation/deactivation images. Would you mind showing
me
how to do the following with Imcalc?
1)select a threshold for masking and exclude all voxels below that
threshold.
2)Calculate the variance across all voxels and divide the masked
activation/deactivation image by the variance.
3)Exclude areas with unusually high variance.
Thank you,
Nathan Klimenko
"The more the universe seems
comprehensible, the more it also seems pointless." Steven Weinberg
(1977) The First Three Minutes.
