Mechanisms of cognitive-behavioral therapy for obsessive-compulsive disorder involve robust and extensive increases in brain network connectivity

T D Moody, F Morfini, G Cheng, C Sheen, R Tadayonnejad, N Reggente, J O'Neill, J D Feusner, T D Moody, F Morfini, G Cheng, C Sheen, R Tadayonnejad, N Reggente, J O'Neill, J D Feusner

Abstract

Cognitive-behavioral therapy (CBT) is effective for obsessive compulsive disorder (OCD); however, little is understood about its mechanisms related to brain network connectivity. We examined connectivity changes from resting-state functional magnetic resonance imaging data pre-to-post-CBT in 43 OCD participants, randomized to receive either 4 weeks of intensive CBT or 4 weeks waitlist followed by 4 weeks of CBT, and 24 healthy controls before and after 4 weeks of no treatment. Network-based-statistic analysis revealed large-magnitude increases in OCD connectivity in eight networks. Strongest increases involved connectivity between the cerebellum and caudate/putamen, and between the cerebellum and dorsolateral/ventrolateral prefrontal cortices. Connectivity increases were associated with increased resistance to compulsions. Mechanisms of CBT may involve enhanced cross-network integration, both within and outside of classical cortico-striatal-thalamo-cortical regions; those involving cerebellar to striatal and prefrontal regions may reflect acquisition of new non-compulsive goal-directed behaviors and thought patterns. Our findings have implications for identifying targets for enhancing treatment efficacy and monitoring treatment progress.

Trial registration: ClinicalTrials.gov NCT01368510.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flowchart for NBS analysis of whole-brain resting-state fMRI. (1) Resting state data were acquired, preprocessed to remove motion artifact, and normalized to the MNI template; (2) On the MNI template, 160 functional nodes were defined; (3) Time series within each node were extracted; (4) Functional connectivity was calculated for each pair of nodes for each participant; (5) 160 × 160 connectivity matrices (full-correlations) were computed; (6) Network-based statistic (NBS) method was used to identify connectivity differences between groups and before and after CBT; (7) Linear regressions compared connectivity strength and OCD symptoms. rsfMRI, resting state functional MRI.
Figure 2
Figure 2
Obsessive compulsive disorder (OCD) networks showing significantly stronger connectivity pre- to post-CBT. L, left; R, right; L.Crus I, L. cerebellum crus I; L.frPole, L. frontal pole; L.ICC, L. intracalcarine cortex; L.Insula, L. posterior insula; L.Lingual, L. lingual gyrus; L.LOC, L. superior lateral occipital; L.parOper, L. parietal operculum; L.PCC, L. posterior cingulate; L.pCun, L. precuneus; L.Put, L. putamen; L.spLobule, L. superior parietal lobule; L.Thal, L. thalamus, caudate; L.V, L. cerebellum V; L.VI, L. cerebellum VI; R.Crus I, R. cerebellum crus I; R.DAC, R. dorsal anterior cingulate; R.frPole, R. frontal pole; R.ICC, R. intracalcarine cortex; R.IFG, R. inferior frontal gyrus, precentral gyrus; R.MFG, R. middle frontal gyrus; R.pCun, R. precuneus; R.STG, R. superior temporal gyrus; R.Thal, R. thalamus. Network-based statistic (NBS) analysis identified eight networks using a t-threshold=6 and P-value <0.01. See Table 2 for list of connections and t-statistics.
Figure 3
Figure 3
Associations between functional connectivity and obsessive compulsive disorder (OCD) symptom severity. (a) Correlation across OCD participants (blue circles) between pre-to-post-CBT change in OCD symptom severity (YBOCS Item 9 sub-score, resistance to compulsions) and pre-to-post-CBT change in functional connectivity between right frontal pole and left parietal operculum (inset right; 10-mm nodes centered at MNI coordinates (6, 64, 3) and (–41, −37, 16); r=0.51, P<0.001). Increased connectivity between this node pair may reflect improved resistance to OCD compulsions induced by CBT. (b) Pre-CBT there was a significant negative correlation between OCD symptom severity (YBOCS scores) and connection strength between left and right insula (inset right). (Nodes centered at (38, 21, −1) and (−36, 18, 2); r=−0.35, P=0.02). Lower pretreatment connectivity between this node pair is associated with worse symptoms. CBT, cognitive-behavioral therapy.

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