Hi Freesurfer Experts, mkanalysis-sess seems to default to a FWHM of 20 for the smooting of the ACF (in version 5.1). I was wondering whether it makes sense to use the same FWHM for volume and surface based analyses of functional data in FSFAST? I seem to remember that the autocorrelations differ between, e.g., grey and white matter, which might be a reason to use a different FWHM on the surface?
Thank you very much, Caspar
Hi Caspar, I have not looked at it much. The temporal whitening has so little effect (at least at the group level), that I cannot imagine that it will make much difference. doug
On 09/19/2013 09:36 AM, Caspar M. Schwiedrzik wrote:
Hi Freesurfer Experts, mkanalysis-sess seems to default to a FWHM of 20 for the smooting of the ACF (in version 5.1). I was wondering whether it makes sense to use the same FWHM for volume and surface based analyses of functional data in FSFAST? I seem to remember that the autocorrelations differ between, e.g., grey and white matter, which might be a reason to use a different FWHM on the surface?
Thank you very much, Caspar
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Hi Doug, thanks for the response. I will also be looking at some single subject data, that's why I am asking. Do you have a hunch? Caspar
On Friday, September 20, 2013, Douglas N Greve wrote:
Hi Caspar, I have not looked at it much. The temporal whitening has so little effect (at least at the group level), that I cannot imagine that it will make much difference. doug
On 09/19/2013 09:36 AM, Caspar M. Schwiedrzik wrote:
Hi Freesurfer Experts, mkanalysis-sess seems to default to a FWHM of 20 for the smooting of the ACF (in version 5.1). I was wondering whether it makes sense to use the same FWHM for volume and surface based analyses of functional data in FSFAST? I seem to remember that the autocorrelations differ between, e.g., grey and white matter, which might be a reason to use a different FWHM on the surface?
Thank you very much, Caspar
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I think even in single subject data it will not be much of an effect. I looked at it a little bit when I first programmed it. doug
On 9/20/13 6:55 PM, Caspar M. Schwiedrzik wrote:
Hi Doug, thanks for the response. I will also be looking at some single subject data, that's why I am asking. Do you have a hunch? Caspar
On Friday, September 20, 2013, Douglas N Greve wrote:
Hi Caspar, I have not looked at it much. The temporal whitening has so little effect (at least at the group level), that I cannot imagine that it will make much difference. doug On 09/19/2013 09:36 AM, Caspar M. Schwiedrzik wrote: > Hi Freesurfer Experts, > mkanalysis-sess seems to default to a FWHM of 20 for the smooting of > the ACF (in version 5.1). I was wondering whether it makes sense to > use the same FWHM for volume and surface based analyses of functional > data in FSFAST? I seem to remember that the autocorrelations differ > between, e.g., grey and white matter, which might be a reason to use a > different FWHM on the surface? > > Thank you very much, > Caspar > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <javascript:;> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <javascript:;> Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <javascript:;> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
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