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Hi Dustin this might be a stupid answer but did you check your mask? it could be that you have few 'bad' scans which make your mask to not include this region ... cyril > I have been running into some problems when generating contrast maps > for individual subjects. When viewing individual subject contrast maps > there are occassionally small areas with no Beta values estimated. In > one subject, a relative large portion of the most posterior visual > cortex has no values estimated. In looking at the functional images > there does not seem to be any grossly obvious problems in these > regions. Can someone please provide some possible explanations for > these missing data values and how they are typically handled? > > Thanks, > Dustin -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.