Hi Brad,

Thanks for your comments. We've reviewed the two dataset you are referring to.

For Sub96591, we reviewed the registered EPI images (EPI to MPRAGE using 6-DOF FLIRT registration in FSL). When registered, the fit is quite good. In the original / native space images the EPI is rotated compared to the MPRAGE (likely reflecting that the functional slices were obtained at an angle). Were you looking at the original images or registered ones?

For sub81737. Looking at the registered images (EPI to MPRAGE) we did not see clear evidence for a possible left-right flip of the EPI compared to the MPRAGE, though we have contacted the site to request they verify the orientation.

Hope this helps, and thanks again for your thoughts!
Maarten