One more question.

As Rick said, it is unlikely to have any significant result from the dataset using 3dLME (two-way repeated ANOVA; 2 groups and 2 conditions/scans with pre- and post-training scans). Before running 3dLEM, I ran a group analysis (i.e., repeated measure) for each group, using FSL (GRF corrected for multiple comparisons, cluster-level thresholding Z > 2.3, p < 0.05). In the experimental group ("ag"), there was a significant effect of the perceptual training (post-/r2 scan > pre-/r1 scan) on a few brain regions/clusters, but not in the control group. Thus I expected to see some significant results from 3dLME, possibly in similar regions/clusters. Can you help me to understand potential reasons why this discrepancy occurred?

As AFNI can cope with more complex group analysis approach, I want to understand AFNI's methods clearly. For this, your inputs will be greatly appreciated!

Best, Sophia