Impaired Voluntary Control in PTSD: Probing Self-Regulation of the ACC With Real-Time fMRI

Area of Science:

• Neuroscience
• Psychiatry
• Psychology

Background:

• Post-traumatic stress disorder (PTSD) involves impaired self-regulation of cognitions and emotions.
• Reduced anterior cingulate cortex (ACC) control may underlie aberrant limbic responses in PTSD.

Purpose of the Study:

• To investigate ACC self-regulation abilities in PTSD patients using real-time fMRI neurofeedback (rt-fMRI NF).
• To compare ACC regulation capacity between PTSD patients and healthy controls.
• To explore the relationship between ACC regulation and PTSD symptom severity.

Main Methods:

• Utilized rt-fMRI NF to train ACC upregulation in nine PTSD patients and nine healthy controls over three days.
• Monitored brain activation patterns, specifically within the ACC, during self-regulation tasks.
• Measured regulation amplitude and learning rate.

Main Results:

• Both groups demonstrated ACC regulation, with widespread brain activation including the ACC.
• PTSD patients exhibited lower regulation amplitude and learning rates compared to controls.
• Lower regulation capacity in PTSD patients correlated significantly with symptom severity.
• A frontopolar activation cluster was uniquely associated with self-regulation efforts in PTSD patients.

Conclusions:

• This is the first study to demonstrate impaired ACC self-regulation in PTSD patients via rt-fMRI NF.
• Findings support theories of ACC-mediated regulatory deficits contributing to PTSD psychopathology.
• Larger controlled trials are warranted to confirm these results and explore therapeutic potential.