Neuronal and oscillatory activity during reward processing in the human ventral striatum

Area of Science:

• Neuroscience
• Neurophysiology
• Human Brain Research

Background:

• The ventral striatum is known from animal studies to be involved in reward processing.
• Deep brain stimulation (DBS) in humans offers a unique opportunity to study neural activity during reward tasks.
• Previous research lacked direct neurophysiological recordings from the human ventral striatum during reward-related behaviors.

Observation:

• Neurophysiological data were recorded from the human ventral striatum during DBS surgery.
• A participant played a video game that provided visual reward images.
• This setup allowed for the analysis of neural responses to reward feedback in real-time.

Findings:

• The study identified the first instances of reward-sensitive single unit activity in the human ventral striatum.
• Local field potential analysis revealed that alpha oscillations correlate with positive feedback.
• Beta oscillations showed higher power during unrewarded trials, and alpha-gamma cross-frequency coupling differentiated feedback valence.

Implications:

• These findings provide direct evidence of the ventral striatum's role in human reward processing at the single-unit level.
• Understanding these neural dynamics can inform treatments for reward-related disorders.
• The study opens new avenues for investigating neural mechanisms of reward and decision-making in humans.