Oscillatory responses to reward processing in borderline personality disorder

Area of Science:

• Neuroscience
• Psychiatry
• Electrophysiology

Background:

• Previous studies indicate impaired reward processing in Borderline Personality Disorder (BPD).
• Specific affected aspects and involved brain regions remain unclear.
• Event-related oscillations (EROs) and source localization offer insights into neural mechanisms.

Purpose of the Study:

• Investigate evoked and induced EROs to feedback events in BPD patients.
• Assess activity in the dorsomedial prefrontal/anterior cingulate cortex (dmPFC/ACC) and orbitofrontal cortex (OFC).
• Elucidate neural underpinnings of reward processing deficits in BPD.

Main Methods:

• 18 BPD patients and 22 healthy controls performed a gambling task.
• 64-channel electroencephalography (EEG) recorded brain activity.
• Source localization (sLORETA) analyzed theta and high-beta EROs in dmPFC/ACC and OFC.

Main Results:

• Reduced theta-band responses to negative feedback in BPD patients, localized to dmPFC/ACC.
• This reduction in evoked responses correlated with trait impulsivity.
• Disturbed evoked responses to feedback magnitude observed in theta (OFC) and high-beta (dmPFC/ACC, OFC) ranges.

Conclusions:

• Findings suggest multiple feedback processing dysfunctions in BPD.
• These dysfunctions implicate distinct reward-processing mechanisms.
• Impaired neural responses in dmPFC/ACC and OFC contribute to BPD-related reward deficits.