 |
 |
Dear Arul, the short answer is no (unfortunately). You can only add an regressor with at least one onset. If you want to parametrically modulate that regressor you have to have 2 onsets. You will have to modify your batch scripts to conditionally include only non-empty onset vectors and I recommend that you also setup your contrast at the same time, so that place the 1's and -1's over the correct columns. Cheers, Jan Arul Thangavel wrote: > Hi everyone, > > I am trying to run a batch script for a study which has multiple > conditions per run and multiple runs. I've got the batch scripts ready, > the problem is that the conditions are performance-contingent, resulting > in not every condition being represented in each run. > > My question is this: Is it possible to have a condition with zero > onsets? Would this in any way undermine the value of the other, non-zero > conditions? Or are the beta values for each of the conditions calculated > separately for each run, allowing me to specify any amount of zero > conditions I like? > > Thanks everyone! If I can indeed specify zero trial conditions it would > greatly speed up my analysis. > > Arul -- Jan Gläscher, Ph.D. Div. Humanities & Social Sciences +1 (626) 395-4976 (office) Caltech, Broad Center, M/C 114-96 +1 (626) 395-2000 (fax) 1200 California Blvd [log in to unmask] Pasadena, CA 91125