High-frequency neuromodulation improves obsessive-compulsive behavior.

Area of Science:

• Neuroscience
• Computational Psychiatry
• Behavioral Economics

Background:

• Obsessive-compulsive behaviors affect nearly a billion people globally, with incomplete mechanistic understanding and limited therapeutic options.
• Current theories link these behaviors to maladaptive habit learning and abnormal orbitofrontal-striatal neurophysiology during reward processing.
• Beta-gamma neurophysiology in reward networks is implicated in obsessive-compulsive behaviors.

Purpose of the Study:

• To investigate the causal role of orbitofrontal cortex beta-gamma neurophysiology in reward learning and obsessive-compulsive behaviors.
• To develop and test a personalized, frequency-specific alternating current stimulation protocol.
• To assess the therapeutic potential of this neuromodulation technique for reducing obsessive-compulsive behaviors.

Main Methods:

• Targeted alternating current stimulation of the orbitofrontal cortex, personalized to individual reward network beta-gamma frequencies.
• Assessment of modulation on reward and punishment-guided choice behavior and learning using an actor-critic architecture.
• Evaluation of chronic stimulation effects on obsessive-compulsive behaviors in a non-clinical population over three months.

Main Results:

• Rapid, reversible, and frequency-specific modulation of reward-guided learning, characterized by increased exploration.
• Chronic stimulation over five days robustly attenuated obsessive-compulsive behaviors for up to three months.
• Greater therapeutic benefits were observed in individuals with more severe symptoms.

Conclusions:

• Convergent mechanisms link reward learning modulation and obsessive-compulsive symptom reduction.
• Beta-gamma rhythms play a unifying functional role in reward processing, learning, and obsessive-compulsive behaviors.
• This research lays the foundation for personalized, circuit-based neuromodulation therapies for obsessive-compulsive and related disorders.