Patients with chronic low back pain show stronger resting connectivity between the default mode network and the right insula, pregenual anterior cingulate cortex, and left inferior parietal lobule compared to healthy controls. Baseline clinical pain correlates positively with default mode network–right insula connectivity. Physical maneuvers that exacerbate pain produce parallel changes in default mode network–right insula connectivity and disrupt default mode network–pregenual anterior cingulate cortex connectivity, which at baseline was anticorrelated with pain. Baseline default mode network connectivity also predicts maneuver-induced changes in both pain and default mode network–right insula connectivity. These findings support resting default mode network connectivity as a potential neuroimaging biomarker for chronic pain perception.
Mindfulness meditation training is linked to structural changes in the hippocampus, specifically the subiculum, which are associated with reduced connectivity between the hippocampus and lateral occipital regions during the retrieval of extinguished fear memories. This reduced connectivity correlates with decreases in self-reported anxiety after mindfulness training. The findings suggest that the subiculum plays a key role in regulating interactions with contextual cues during memory retrieval, and that mindfulness training may foster resilience by altering these brain circuits.