I would very much appreciate your help with the following problem I have been encountering in SPM5:
when specifying a full factorial (2x2) design or a flexible factorial with subject factor and the 2 other factors, I get an error at the estimation level: "please check your data, there are no significant voxels"
This is quite disturbing since the con.img used are working fine in other types of analysis and also in a flexible factorial design if the subject factor is not specified.
Any ideas on why this is happening and how to solve this would be of great help.
Thank you very much,