Figure 5.

Psychophysiological interaction analysis showing connectivity changes between MTL and midbrain as a function of repetition and condition. A. A region spanning left PRc and ERc, showed significantly greater connectivity change for overlapping than non-overlapping pairs (as indexed by differences between first and last repetitions) with a seed midbrain region. Color bar indicates voxelwise t-value. B. Follow-up ROI analyses revealed decreasing connectivity between midbrain and ERc/PRc across repetitions of non-overlapping pairs (green bar), in contrast to increasing connectivity across repetition of overlapping pairs (blue bar). Bar heights represent group means; error bars represent standard error. Asterisks indicate significant repetition-related changes in connectivity at p < 0.05; bar with a tensor symbol designates a significant interaction between repetition-related connectivity changes and condition at p < 0.05.