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Hello, I've read some posts on how it might be possible to take an fstat or zfstat image from a lower-level analysis and pass it up to a higher level analysis. The reason I'm interested in this is because my fMRI activations use temporal basis functions, and I want to allow the specific mix of basis function elements to vary across subjects. To test this out, I made up a simple simulated data set w/ multiple subjects, ran my first level analysis, and then tried to pass the zfstat and fstat images to a "simple OLS" analysis at the higher level. Here is the error message I received at the "Higher Level Input Preparation" stage: <<<<<< /usr/pubsw/packages/fsl/current/bin/fslmaths cope1 -mas mask cope1 echo 1 > design.lcon /usr/pubsw/packages/fsl/current/bin/fslmerge -t varcope1 0 0 0 0 0 0 0 ** ERROR (nifti_image_read): failed to find header file for '0' ** ERROR: nifti_image_open(0): bad header info Error: failed to open file 0 Cannot open volume 0 for reading! /usr/pubsw/packages/fsl/current/bin/fslmaths varcope1 -mas mask varcope1 ** ERROR (nifti_image_read): failed to find header file for 'varcope1' ** ERROR: nifti_image_open(varcope1): bad header info Error: failed to open file varcope1 Cannot open volume varcope1 for reading! >>>>>> I tried renaming the zfstat and fstat images to look like a cope, and I also tried using the mask image as the varcope (since it seems like its looking for a varcope image, even though the OLS processing does not use that information). I ran an OLS analysis on proper copes, and that ran without errors. Any idea what the problem could be? Thanks for your help! --Patrick