If I understand your experiment correctly, you have a simple 2 x 2 repeated-measures (or within-subject) ANOVA. There are multiple ways to analyze your data depending on your specific hypotheses. One possible (and straightforward) approach is to use 3dANOVA3 -type 4. Read the help for more detaisl:
3dANOVA3 -help
Gang
Edited 1 time(s). Last edit at 06/20/2015 08:40AM by Gang.