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A mean image should be created for each subject - rather than each session. If you have multiple runs for each subject, then each of these would be treated as a "session" (many people prefer to refer to these as "runs"). In the batch user interface of SPM5, you need to use a separate Realign job for each subject. Best regards, -John ________________________________ From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Keiko Tatsumi Sent: Monday, September 10, 2007 11:59 PM To: [log in to unmask] Subject: [SPM] no mean image created Dear SPMers, I am new to SPM5 and am now trying to batch process my fMRI experiment data with the program. Out of 84 sessions I have "Realigned (Estimate and Reslice)" so far, only 5 sessions came out with their mean images - I wonder whether I am doing something wrong or it is just a bug. There seems to be no logic as for when a mean image is generated for a particular session. I tried to take advantage of "SPM Quickstart" by Dr. Patterson in which how to creat "mean image only" is well explained. I batch processed 10 sessions following the procedure given in the document; yet only one session came out with the mean image. Should you have the same problem and hopefully have solved it, please let me know how. If it is a bug, I would like to know how to fix it. I would truly appreciate your suggetions. Keiko Tatsumi