I see what you mean. Is it possible that they are the same direction? When you look at the angle values when running them individually, are they the same or opposite sign? Are you sure that the par file lists one as positive and one as negative? doug
On 08/06/2012 02:56 PM, Thomas Janssens wrote: > Hi Doug, > > the p-values are all much lower when I combine both the > counterclockwise and clockwise stimuli and the angle maps look > completely different. > I have noticed that for the eccentricity data I have the same problem > (contracting and expanding rings). > > Below you can find the images (it is macaque MION fMRI data). > > > > > Thanks, > > Thomas > > On 06 Aug 2012, at 19:43, Douglas N Greve wrote: > >> what is it that is noisy? The angle map or the p-value map? Can you send >> pics? >> doug >> >> On 08/06/2012 12:41 PM, Thomas Janssens wrote: >>> Hi, >>> >>> I am currently analyzing some retinotopy data. >>> For the polar angle stimulus we had both clockwise and >>> counterclockwise stimuli. >>> Both of them started at the top of the screen (12 o'clock), each run >>> includes 4 full cycles and ends with the last wedge slightly >>> before/after 12o'clock. >>> >>> We have created seperate paradigm files (direction pos / direction >>> neg) for the clockwise and counterclockwise runs and followed the >>> steps as indicated by the "FsFastIndividualRetinotopyAnalysis". >>> However, when we run the Freesurfer retinotopy analysis on the whole >>> data set, the polar angle is very noisy. >>> When we run the same analysis separately for the clockwise and >>> counterclockwise runs separately, the results look much better. >>> Could anyone tell me what I am doing wrong? >>> >>> Thanks! >>> >>> Thomas >>> >>> >>> >>> >>> >>> _______________________________________________ >>> 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 >> Fax: 617-726-7422 >> >> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting >> FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> > > Thomas Janssens, PhD student FWO > Laboratorium voor Neuro- en Psychofysiologie > K.U.Leuven Medical School > Herestraat 49, B-3000 Leuven (Belgium) > phone +32 16 33 00 35 > cell phone +32 494 115 509 > thom...@nmr.mgh.harvard.edu <mailto:thom...@nmr.mgh.harvard.edu> > thomas.janss...@med.kuleuven.be <mailto:thomas.janss...@med.kuleuven.be> > -- 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list 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.
