Please ignore my previous post. I was wrong on so many levels! Thanks
S On Fri, Mar 30, 2018 at 8:34 AM, Sarah Cole <coleashle...@gmail.com> wrote: > Hi Doug, > > Sure. I have attached an excel sheet. > I have averaged the signal magnitude across 16 blocks of objects, and 16 > blocks of scenes, separately. Each block has 8 TRs (TR=2). > > The top plot is the data with the default -TR/2 delay. > The bottom plot is the data with -2TR delay. > > In both plots, we see that the signal drops in the first 2 TRs and then > starts rising around TR 3. We would like to see this rise at TR1, that's > why we think that we need to shift the onset times. > However, when we added the -2TR delay, we still got the same fall and > rise. This pattern is consistent across all subjects. > > When we were using SPM, we always shifted the signal by 2TRs and always > saw the rise at the first TR. I am not sure what I am doing wrong, here. > > Appreciate your help. > > Thanks, > > On Fri, Mar 30, 2018 at 8:09 AM, Douglas Greve <dgr...@mgh.harvard.edu> > wrote: > >> not sure what you are trying to do. can you send a picture? the default >> lag is TR/2 >> >> On 3/29/18 2:30 PM, Sarah Cole wrote: >> >> Thanks, Doug. >> >> I added (-4s) delay and plotted the data but I got the same delay as no >> shift. Also I did (+4) delay and lost most of the activation. >> >> Do you have any recommendations? >> >> Thanks, >> Sarah >> >> On Wed, Mar 28, 2018 at 4:39 PM, Douglas N. Greve <dgr...@mgh.harvard.edu >> > wrote: >> >>> You can use the -delay flag in mkanalysis-sess >>> >>> doug >>> >>> >>> On 03/28/2018 05:35 PM, Sarah Cole wrote: >>> > Hi Doug, >>> > >>> > I have a block design experiment. After analyzing the data and >>> > plotting the response magnitude across the TRs, we see that there is a >>> > systematic lag in the response. For example, in a 16s block (TR=2s), >>> > at TR-1 and TR-2 the response goes down and then starts rising from >>> > TR-3. This is consistent across the subjects and blocks. >>> > >>> > We used to shift our raw data by 2 TRs when we were using SPM. >>> > >>> > How can we do this in FreeSurfer? >>> > >>> > Thank you, >>> > >>> > Sarah >>> > >>> > >>> > _______________________________________________ >>> > Freesurfer mailing list >>> > Freesurfer@nmr.mgh.harvard.edu >>> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >>> >>> _______________________________________________ >>> 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. >>> >>> >> >> >> _______________________________________________ >> Freesurfer mailing >> listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> >> >> _______________________________________________ >> 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. >> >> >
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