How does reward expectation influence cognition in the human brain?

Area of Science:

• Cognitive neuroscience
• Neuroeconomics

Background:

• Reward prospect influences human cognition and behavior.
• Understanding the neural mechanisms of reward-based cognitive modulation is crucial.

Purpose of the Study:

• To investigate how fluctuating reward expectations bias cognitive processes.
• To differentiate the effects of reward expectancy from task-specific network changes.
• To examine neural correlates of reward-biased cognitive control.

Main Methods:

• A novel continuous performance task with fluctuating reward expectations.
• Behavioral analysis of reaction time, accuracy, and sensitivity.
• Functional magnetic resonance imaging (fMRI) to assess brain activity.
• Effective connectivity analysis to explore neural pathway interactions.

Main Results:

• Behavioral data showed improved reaction time and accuracy for reward-relevant tasks.
• Reward expectation increased medial frontal cortex activity irrespective of task modality.
• Modality-specific changes observed in lateral frontal, parietal, and temporal cortices.
• Enhanced functional connectivity in visual pathways and prefrontal cortex.

Conclusions:

• Reward expectancy significantly biases cognitive processes towards relevant modalities.
• Neural networks, including the medial frontal cortex, are modulated by reward proximity.
• Distributed cortical network changes reflect the brain's representation of future rewards and their likelihood.