23 patients with OCD and 23 age- and gender-matched normal controls were examined using resting-state fMRI, and amplitude of low-frequency fluctuation (ALFF) approach was used to analyze fMRI data.
Compared with normal controls, patients with OCD presented increased ALFF in the bilateral orbitofrontal cortex (OFC), anterior cingulate cortex (ACC) as well as decreased ALFF in the bilateral cerebellum and parietal cortex (P < 0.01, corrected). Additionally, the ALFF values in bilateral OFC were positively correlated with total Y-BOCS scores (P < 0.005, uncorrected).
Our findings added an expanding literature to the abnormality hypothesis of orbitofronto-striatal circuits and showed the changed spontaneous neuronal activity of the parietal cortex and cerebellum may also play an important role in the pathophysiology in patients with OCD.