Hi Cesar, for your case, it would correspond to 4sec prior to stimulus onset (the TR that goes from -4 to -3 sec). What seems to be wrong? The last frame would be the TR that goes from +9sec to +10 sec. Not related to your question, but Is 10 sec post stimulus long enough? doug
On 03/05/2013 11:53 AM, Cesar E Echavarria wrote: > > Hi Freesurfers, > > I did an FIR analysis to get the BOLD response over time, the following way > > mkanalysis-sess -analysis Afterimage_FIR2.rh -surface self rh -native > -fwhm 5 -paradigm ShapeAE_New.par -event-related -polyfit 1 -mcextreg -TR > 1.000 -nconditions 8 -force -fsd bold -fir 4 14 > > I then generated the relevant contrasts, ran the funcroi-config command, > and the func-roi-table-sess command to create 14 files for my ROI, each > containing the signal value at 14 different time points. > > i.e. > funcroi-table-sess -sf sessid -roi Labels/rh.V1 -c condition1 -map cespct > -o ROI/frame0 -frame 0 > > funcroi-table-sess -sf sessid -roi Labels/rh.V1 -c condition1 -map cespct > -o ROI/frame1 -frame 1 > > . > . > . > funcroi-table-sess -sf sessid -roi Labels/rh.V1 -c condition1 -map cespct > -o ROI/frame13 -frame 13 > > > > My question is this: > > To what time point (relative to stimulus onset) does the value in the > frame0 file correspond? > > As I understand it, the first 4 frame values should correspond to activity > pre-stimulus. However, this expectation is not corroborated by the timing > and pattern of the BOLD response I am observing. > > I would appreciate any guidance on this issue. > > Thanks, > > Cesar Echavarria > > -- 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 Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
