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Dear SPMers, I am new to SPM and I would appreciate any help on the following question. I have a four session design. Each session contains all the conditions I want to compare later on through contrasts. When presented, the sessions follow each other and there is a very short break between sessions presentation (30sec approx.).Participants stay still and they only get out of the scanner after they have completed all the sessions. I have analysed the data as one single session (instead of 4) as this made contrast definition easie .... I am now unsure about how correct this is. Do I violate any assumptions? Is it a common procedure to regard multiple sessions as one? Is this ‘eligible’? thanks so much in advance, I am sure any comment would be of great help to me. Christina