 |
 |
Hi - it's in the units of whatever stats image you've selected in featquery - if it's a zstat image it's in "zstat" (ie standard deviation) units - if it's a cope, and you've selected the "convert cope to %" button then it's in units of % change, etc. Cheers. On 12 Apr 2006, at 00:21, Meredith Braskie wrote: > Thanks! I am still unclear, however, on the unit value for the > thresholding. For instance, if you set it to .2 as in your > example, it is .2 what? > -Meredith > > On Apr 10, 2006, at 11:02 PM, Steve Smith wrote: > >> Hi Meredith, >> >>> First of all, it >>> looks as though the threshold that one can set in featquery >>> refers to % signal >>> change, but I wanted to verify whether that was the case. >> >> Hi - no, given that the thresholding might get applied to any of >> the different types of stats images, % would not be generally safe >> - the number entered after this option is exactly what's applied. >> >>> Also, I am running >>> featqueries on a feat that contains two copes. Featquery is >>> calculating stats for each >>> cope, including % signal change (as I was hoping), but I can't >>> figure out how to get >>> the accompanying mean time series information for each cope >>> (voxels in the ROI >>> that pass the threshold). It looks as though perhaps the mean >>> time series >>> information that is included is for all voxels that passed >>> threshold for either cope, but >>> I need that mean time series information for each cope >>> separately. I figure featquery >>> must calculate this somewhere since it is determining percent >>> signal change. How >>> might I access this information? >> >> Hi - if you click on the stats name (e.g. stats/cope1) you get the >> timeseries at the _max_ voxel. Featquery doesn't calculate the >> mean timeseries from the masked thresholded stats image. Do get >> that, you would: >> >> cd <whereever>.feat/featquery >> avwmaths ../stats/cope2 -mas mask -thr 0.2 -bin grot >> avwmeants -i ../filtered_func_data -o meants.txt -m grot >> >> Cheers, Steve. >> >> >> --------------------------------------------------------------------- >> ------ >> Stephen M. Smith, Professor of Biomedical Engineering >> Associate Director, Oxford University FMRIB Centre >> >> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK >> +44 (0) 1865 222726 (fax 222717) >> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve >> --------------------------------------------------------------------- >> ------ >> ------------------------------------------------------------------------ --- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ------------------------------------------------------------------------ ---