Neural mechanisms of acceptance-commitment therapy for obsessive-compulsive disorder: a resting-state and task-based...

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Psychology

Background:

• Growing evidence supports acceptance-commitment therapy (ACT) for obsessive-compulsive disorder (OCD).
• Neural mechanisms underlying ACT's effectiveness in OCD remain underexplored.
• This study investigates the neural correlates of ACT in OCD patients using fMRI.

Purpose of the Study:

• To elucidate the neural correlates of ACT in patients with OCD.
• To examine task-based and resting-state fMRI changes after ACT intervention.
• To correlate neural findings with psychological measures.

Main Methods:

• Randomized controlled trial with 42 OCD patients (21 ACT, 21 wait-list).
• 8-week group-format ACT program for the intervention group.
• fMRI scans and psychological assessments pre- and post-intervention.

Main Results:

• ACT increased activation in bilateral insula and superior temporal gyri (STG) during a thought-action fusion task.
• Strengthened left insula-inferior frontal gyrus (IFG) connectivity post-ACT.
• Increased resting-state connectivity in posterior cingulate cortex (PCC), precuneus, and lingual gyrus.

Conclusions:

• ACT's therapeutic effects in OCD involve salience, interoception (insula), multisensory integration (STG), language (IFG), and self-referential processes (PCC, precuneus).
• Neural changes observed provide insights into the psychological mechanisms of ACT for OCD.
• Specific brain regions and their interactions are key to understanding ACT's efficacy.