Feedback-Related Negativity and Frontal Midline Theta Reflect Dissociable Processing of Reinforcement

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Prediction errors (PEs) are vital for reinforcement learning, encoding rewarding and aversive experiences.
• The feedback-related negativity (FRN), an event-related potential (ERP) component, is thought to reflect PE signals.
• Frontal midline theta (FMΘ) activity is also associated with reinforcement processing and unexpected events.

Purpose of the Study:

• To investigate the distinct roles of FRN and FMΘ in processing positive and negative reinforcement.
• To determine if FRN and FMΘ differentially respond to outcome valence and magnitude.
• To clarify the cognitive processes underlying FRN and FMΘ during reinforcement learning.

Main Methods:

• Electroencephalography (EEG) was recorded during a monetary incentive delay (MID) task.
• Participants completed conditions with positive and negative reinforcement, and control conditions.
• Analysis focused on FRN and FMΘ responses to varying feedback levels and conditions.

Main Results:

• FRN was sensitive to errors in both positive and negative reinforcement, but not control conditions.
• FMΘ responded to outcomes in positive reinforcement and control conditions, but not negative reinforcement.
• FRN tracked feedback point levels, while FMΘ did not, suggesting FRN reflects unsigned PEs (salience).

Conclusions:

• FRN and FMΘ index dissociable cognitive processes in reinforcement learning.
• FRN appears to signal unsigned prediction errors or salience.
• FMΘ may reflect sensitivity to negative cues and the need for cognitive control.