Reward expectation yields distinct effects on sensory processing and decision making in the human brain

Area of Science:

• Neuroscience
• Cognitive Science
• Decision Science

Background:

• Reward expectation significantly influences attention and decision-making.
• Previous research often conflated sensory processing and decision-making effects of reward.
• Distinguishing the neural mechanisms of attention and decision biases driven by reward is crucial.

Purpose of the Study:

• To identify distinct mechanisms of reward expectation controlling spatial attention and decisional biases.
• To differentiate between space-specific and choice-specific reward modulations.
• To investigate the neural correlates and attentional resource limitations associated with each type of reward modulation.

Main Methods:

• Utilized human cortex studies to differentiate sensitivity and criterion effects.
• Manipulated reward expectations across locations (space-specific) and choices (choice-specific).
• Measured neural and physiological signatures of attention (e.g., ERPs, alpha-band power, eye movements) and decisional biases.

Main Results:

• Space-specific reward modulation affected attention (sensitivity) and reflected limited attentional resources.
• Choice-specific reward modulation affected decision biases (criterion) independently of attention.
• Distinct neural markers were associated with space-specific (attention) versus choice-specific (decision) reward modulations.

Conclusions:

• Reward expectation employs dissociable neural mechanisms to control spatial attention and decision biases.
• Space-specific reward impacts attentional selection, while choice-specific reward influences decisional biases.
• Findings clarify the interplay between reward, attention, and choice in the human brain.