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Hi All -- I have pre and post data for two groups (intervention and control), and wish to test the differences between groups in across-session changes in neural activity 1) during one condition and 2) for a contrast btwn multiple conditions). However, due to attrition and some subjects excluded for head movement, my pre and post groups are not identical. I think this precludes the use of a paired t-test (which if I'm right could compare each subject to themselves pre-post and then allow for second level analysis of resulting contrasts). If I wanted to include all my sessions, and treat pre-post as a variable without assuming identical subjects between sessions, could I use ANOVA instead? Would I use beta scores to test for differences within condition, and contrasts to assess differences between conditions? Thanks very much for any help, Jamil