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Neuronal activity in primate orbitofrontal cortex reflects the value of time
Matthew R Roesch1, Carl R Olson
1Center for the Neural Basis of Cognition, Mellon Institute, University of Pittsburgh, Pennsylvania, USA. mroes001@umaryland.edu
Journal of Neurophysiology
|June 17, 2005
Summary
Neurons in the orbitofrontal cortex (OF) represent reward value, considering factors like delay. This brain region
Area of Science:
- Neuroscience
- Decision-making
- Reward processing
Background:
- Orbitofrontal cortex (OF) neurons signal reward value based on intrinsic attributes and extrinsic factors like satiation.
- Previous research has not fully explored the impact of reward delay on OF neuronal activity.
Purpose of the Study:
- To investigate whether the expected delay before reward delivery influences neuronal activity in the orbitofrontal cortex (OF).
Main Methods:
- Monkeys performed a memory-guided saccade task with cues predicting short or long reward delays.
- Recorded neuronal activity in the OF during task performance.
Main Results:
- OF neurons showed stronger responses to cues predicting shorter reward delays.
- This anticipatory firing strength correlated with responses to reward size.
Conclusions:
- Orbitofrontal cortex (OF) neuronal activity reflects the time-discounted value of expected rewards.
- Reward delay is a critical extrinsic factor influencing OF value representation.