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I have two basic questions. 1- I am currently having some AP fMRI runs and I have also acquired a single PA run to be able to do distortion correction, my original plan was to use FSL and apply topup to get the undistorted fMRI data. How can I fit it within the preproc-sess command? ( I suppose the motion correction and slice timing correction should be done before topup), could you please suggest me what is more appropriate to do? 2- In my study, for each subject I did 8 runs in a single data acquisition session. The runs that I have are 2 different types; The first type of runs ( 4 runs) have black background and the other 4 runs have the gray background. My ultimate goal is to compare these 2 conditions in a group and subject level. Do you suggest that in the functional folder, I create two sessions per subject and put the four runs with gray background in session 1 and the other four runs with the black background in session 2? Thank you so much for your time and consideration. Asa Farahani Sent from Mail<https://secure-web.cisco.com/14-OsICoCS2xDYjCLpXfqNBQLlPmq6KfR6gvoFX6GyqCqlaPr8PxhOk_8UiLLOvuCnvImp_9wWSbODZwZiOj00zNRyCuaK-p2msVqLhnpxBzw06IbI4y5tVCoBp4WACY8yg3hEjAkQ0PRKiA_Nlto72jaewISn5VafPxpAUObjg1y9D2VkkFssqZoTovDa72v3-fi2Msn0ApDAZ0wQ7yf7YhY7zpMyN36pbreW3jRHY2uoPs8StuqcOTqyZKyYJW7MuYuJ1N1B6sovVYhLTLlzyDQD95FyAgD8iJ_6cSJP9AadmLF68t7etk_08n3KDLy/https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkId%3D550986> for Windows
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