Reward modulates cortical representations of action

Area of Science:

• Neuroscience
• Cognitive Psychology
• Decision Science

Background:

• Performance improvements are often linked to reward, but the underlying neural mechanisms are not fully understood.
• Understanding how reward influences motor control is crucial for various applications, from rehabilitation to optimizing human-computer interaction.

Purpose of the Study:

• To investigate the neural basis of reward-driven performance enhancement in a motor task.
• To determine how different reward magnitudes affect action speed, accuracy, and associated brain activity.

Main Methods:

• Participants performed a sequence production task with varying monetary reward levels.
• Brain activity was monitored using functional neuroimaging prior to movement execution.
• Multivariate pattern analysis was employed to decode upcoming actions from neural activity.

Main Results:

• Increased reward magnitude led to faster and more accurate task performance.
• Higher rewards correlated with elevated neural activity in widespread brain regions before movement.
• Neural representations of upcoming actions in motor planning areas, including the supplementary motor area (SMA), were enhanced under larger rewards.

Conclusions:

• Reward enhances motor performance by strengthening neural representations of actions during motor planning.
• The findings suggest a direct link between reward processing, motor preparation, and behavioral execution.