To clarify, I am piggy-backing on the retinotopic analysis to map out orientation preference with the travelling-wave method. We presented subjects with a rotating grating and right now I am simply interested in finding the voxels that have significant activity in response to any orientation. Now, when I load the sig.nii file under the 'polar' folder with MATLAB I see that each voxel has 2 values. I understand that these are the p-values for the real and imaginary components of the signal. Is there a way to put these 2 values together for my purposes? Is there a file somewhere in the pipeline that will give me the values I am looking for?
Thanks you for your help Cesar On Wed, Dec 4, 2013 at 10:14 AM, Douglas N Greve <gr...@nmr.mgh.harvard.edu>wrote: > > They are compared against 0 (ie, no change from baseline). The negatives > just mean that the real component was negative > doug > > > > On 12/03/2013 06:21 PM, Cesar Echavarria wrote: > >> >> So I want to figure out which voxels were modulated significantly by the >> orientation of our stimuli. Is this the right file to look at? If so what >> are the real and imaginary components compared against? I want to know to >> make sense of the negative values. >> >> On Dec 3, 2013 5:52 PM, "Douglas N Greve" <gr...@nmr.mgh.harvard.edu<mailto: >> gr...@nmr.mgh.harvard.edu>> wrote: >> >> It is the -log10(pvalue) where pvalue is the p-value from the F-test >> of the real and imaginary components >> doug >> >> >> >> >> >> On 12/03/2013 05:41 PM, Cesar Echavarria wrote: >> > Hi freesurfers, >> > >> > I conducted a retinotopic analysis for one of my subjects. I was >> > wondering if any of you knew what is represented by the values >> in the >> > sig.nii file under the 'polar' directory that the process puts out. >> > >> > I appreciate your help! >> > >> > Cesar >> > >> > >> > _______________________________________________ >> > Freesurfer mailing list >> > Freesurfer@nmr.mgh.harvard.edu >> <mailto:Freesurfer@nmr.mgh.harvard.edu> >> >> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> -- >> Douglas N. Greve, Ph.D. >> MGH-NMR Center >> gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu> >> Phone Number: 617-724-2358 <tel:617-724-2358> >> Fax: 617-726-7422 <tel: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 <mailto:Freesurfer@nmr.mgh.harvard.edu >> > >> >> 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. >> >> > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu > Phone Number: 617-724-2358 > Fax: 617-726-7422 > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > > -- Cesar Echavarria Research Assistant Martinos Center for Biomedical Imaging, Harvard-MGH Brain & Cognitive Sciences | MIT 2012
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