For condition 4 (posslope), the weight is always 0. You can't compute a slope if all the values are the same. doug
On 10/29/2013 10:44 AM, Suzanne Oosterwijk wrote: > Hi Doug, > > Attached is the Xtmp.mat file for the analysis that gets the error. > > Thanks for your response on the second question. I am not sure what > you mean with demeaning, so I guess that I am not doing that :-) I > just wanted to make sure that not getting the same results does not > indicate a fundamental problem in my paradigm files. > > Thanks! > Suzanne > > > On Tue, Oct 29, 2013 at 3:31 PM, Douglas N Greve > <[email protected] <mailto:[email protected]>> wrote: > > Hi Suzanne, can you send me the Xtmp.mat file that gets created? > > On your second question, the answer might be a little tricky. > First, are you demeaning the modulation value? If not, then you > can certainly get different maps. The other part is that you can > get unpredicatable results because the design matrix is not > orthogonalbecause you have several event types. > > doug > > > > On 10/28/2013 12:30 PM, Suzanne Oosterwijk wrote: > > Hi Doug, > > I am running parametric modulation analyses in which I am > modeling 5 different ratings given by participants in response > to images. To model these ratings I made paradigm files > defining both the onset and the slope for each trial (see > email exchange below). Since I have 5 different ratings, I > made 5 different paradigm files per participant, per run. > These paradigm files hold the exact same trial sequence, only > with different numbers for the slope condition. When running > selxavg3-sess I get the following error: > > Input to SVD must not contain NaN or Inf. > > Error in cond (line 36) > s = svd(A); > > Error in fast_selxavg3 (line 279) > XCond = cond(XtX); > > The strange thing is that selxavg3-sess stops running at a > particular participant when I am trying to model one > particular rating, whereas the exact same analysis for the > other three ratings I have run so far (for the same > participant) does not result in an error. I checked the > paradigm files over and over but I cannot find the mistake. > The paradigm files are all the same in terms of timing and > condition codes etc., the only thing that is different between > the files are the specific ratings per trial. So I really > don't understand why I get this error. I attached the paradigm > files for the erroneous analysis and also for the analysis > that runs successfully. I also attached the selxavg3-sess > logfile for the an erroneous analysis and for the successful > one. Maybe I am missing something here, but I just don't see it. > > Also, I have one other question concerning the parametric > modulation. As I understand it modeling the onset is the same > analysis as a normal contrast comparing a particular condition > against baseline. I compared the onset significance maps > (comparing onset to baseline) for each separate rating, and to > my surprise they are not the same. Since only the ratings > differ between the different analyses, and not the onset times > of the stimuli, I expected those maps to be completely > identical. Am I right in this assumption, or is there a reason > they can be different? > > Thanks! > Suzanne > > > > On Thu, Aug 15, 2013 at 4:28 PM, Douglas Greve > <[email protected] <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]>>> wrote: > > Hi Suzanne, that is fine > doug > > > > On 8/14/13 7:13 AM, Suzanne Oosterwijk wrote: > > Hi Doug, > > Just a follow-up question. The ratings that I > collected for the > parametric modulation analysis have a range from 0 to > 1. This > means that the weights for some stimuli will have the > value 0. Is > this a problem? I am asking just to make sure that a > weight of 0 > does not exclude the corresponding data-point. > > Thanks, > Suzanne > > > On Fri, Jul 26, 2013 at 7:14 PM, Douglas Greve > <[email protected] > <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]>>> wrote: > > Hi Suzanne, yes that looks correct. > doug > > > > On 7/26/13 9:27 AM, Suzanne Oosterwijk wrote: > > Hello all, > > I want to perform a parametric modulation > analysis in > Freesurfer and I have a question about how to > adapt my > paradigm file. I understand how to code the > offset and the > slope (by adding the individual ratings as the > slope > weight), but I just want to check whether I am > correctly > modelling the trials of no interest. > > I have presented people with negative, > positive and neutral > images all preceded by a fixation cross. I > have individual > ratings for the negative images that I want to > use for the > parametric modulation analysis, but I don't > have any ratings > for the positive and neutral images. I do want > to model > these images and the fixation cross, however, > to make sure > that do not become part of the null. Based on > the wiki I > adapted my paradigm file like this: > > (1 = offset for the negative image; 2 = slope > for the > negative image; 3 = neu/pos image of no > interest; 4 = fixation) > > 00121NULL > 12431fix > 15131negoffset > 1523.79negslope > 18431fix > 21331neu/pos > 24431fix > 27131negoffset > 27231.00negslope > 30431fix > 33131negoffset > 3323.49negslope > 36091NULL > etc. > > Is this correct? > > Thanks so much for responding! > Suzanne > > > > -- > Suzanne Oosterwijk, Ph.D. > > Postdoctoral Researcher > > Department of Social Psychology > > University of Amsterdam > > s.oosterwijk@u <mailto:[email protected] > <mailto:[email protected]>>va.nl <http://va.nl> > <http://va.nl> > > > https://sites.google.com/site/suzanneoosterwijk/ > > __._,_.___ > Reply via web post > > > <http://groups.yahoo.com/group/martinos-tech/post;_ylc=X3oDMTJwM2ltbGk0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBG1zZ0lkAzU4MzAEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzc0ODQ1MjUy?act=reply&messageNum=5830> > Reply to sender > <mailto:[email protected] > > <mailto:[email protected]>?subject=Re%3A%20parametric%20modulation> > Reply to group > <mailto:[email protected] > > <mailto:[email protected]>?subject=Re%3A%20parametric%20modulation> > Start a New Topic > > > <http://groups.yahoo.com/group/martinos-tech/post;_ylc=X3oDMTJlMGwxMWZ1BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTM3NDg0NTI1Mg--> > Messages in this topic > > > <http://groups.yahoo.com/group/martinos-tech/message/5830;_ylc=X3oDMTM0bWtjcmt0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBG1zZ0lkAzU4MzAEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMzc0ODQ1MjUyBHRwY0lkAzU4MzA-> > > > (1) > > Recent Activity: > > Visit Your Group > > > <http://groups.yahoo.com/group/martinos-tech;_ylc=X3oDMTJlNWFnMGY0BF9TAzk3MzU5NzE0BGdycElkAzQ5ODAyNjAEZ3Jwc3BJZAMxNzA1NzI4NjExBHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTM3NDg0NTI1Mg--> > > Yahoo! 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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. > > > > > -- > Suzanne Oosterwijk, Ph.D. > > Postdoctoral Researcher > > Department of Social Psychology > > University of Amsterdam > > s.oosterwijk@u <mailto:[email protected] > <mailto:[email protected]>>va.nl <http://va.nl> > <http://va.nl> > > https://sites.google.com/site/suzanneoosterwijk/ > > > > > > -- > > Suzanne Oosterwijk, Ph.D. > > Postdoctoral Researcher > > Department of Social Psychology > > University of Amsterdam > > s.oosterwijk@u <mailto:[email protected] > <mailto:[email protected]>>va.nl <http://va.nl> <http://va.nl> > > https://sites.google.com/site/suzanneoosterwijk/ > > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > [email protected] <mailto:[email protected]> > 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/ > > > > > -- > > Suzanne Oosterwijk, Ph.D. > > Postdoctoral Researcher > > Department of Social Psychology > > University of Amsterdam > > s.oosterwijk@u <mailto:[email protected]>va.nl <http://va.nl> > > https://sites.google.com/site/suzanneoosterwijk/ > -- Douglas N. Greve, Ph.D. MGH-NMR Center [email protected] 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/ _______________________________________________ Freesurfer mailing list [email protected] https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
