The pickatlas implements a small volume correction. You can (and
should) still use the FWE and FDR options. The computations will be
performed on the reduced number of voxels.
You can use the most recent version of the pickatlas (v 2.1) to perform
subtractions of masks through advanced mode to generate the mask you
describe. The user manual has not yet been updated to demonstrate this
function, but it does give an example of the use of the advanced mode.
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Joseph A. Maldjian, MD
Professor, Dept. of Radiology and Biomedical Engineering
Director Advanced Neuroscience Imaging Research Core (ANSIR)
Wake Forest University School of Medicine
Office: 336 716-2815
fax: 336 716-2870
email: [log in to unmask]
website: www.ansir.wfubmc.edu/maldjian.htm
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-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]]
On Behalf Of Ryan Dobbs
Sent: Friday, August 04, 2006 11:37 AM
To: [log in to unmask]
Subject: [SPM] wfu_pickatlas & FWE
Yesterday I was informed not to use FWE when using wfu_pickatlas becasue
it already performs a SVC. However, I had a couple questions for
clarification:
1. Can someone explain the rationale behind not using FWE and SVC. I'm
pretty sure I understand why, but my boss said "that's how we've always
done it," and is giving me a hard time about the info I was given.
2. If i don't use FWE with wfu_pickatlas, do i choose none @ .001?
3. How do I create a mask using wfu_pickatlas? I've just been doing it
manually, and no one here seems to be able to help me. I want one for
[frontal - 9_44_45_46_47], 21_22_39, 44_45_47, 9_46, 9_44_45_46_47,
etc.
I was told to use the toolbox to create one, but I have no idea what i'm
doing. Is this explained in the user's guide?
Thanks
Ryan
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