Dear All,

I believe this modified version of spm_estimate_PPI.m will solve the issue. If the new m-file does not solve the issue, please let me know.

Future of the gPPI Toolbox:
The long-term goal is to build gPPI as a standalone tool that can integrate with fsfast, spm, and/or fmristat for the estimation step. The base code will likely be in R. This should make the toolbox easier to maintain across platforms and software and eliminate the requirement of matlab.

There may also be certain advantages of moving in this direction, such as being able to add histories to nifti files and working with minc files.

Overall, this means the the core code will be separate from the estimation and contrast AND a script will be provided based on the estimation tool that the user wants to use. The base code will be validated against the full SPM implementation before release.

Best,
Donald