Reward salience but not spatial attention dominates the value representation in the orbitofrontal cortex.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Decision Neuroscience

Background:

• The orbitofrontal cortex (OFC) is crucial for value-based decision-making.
• Understanding how attention modulates OFC value encoding is essential but remains unclear.

Purpose of the Study:

• To investigate the influence of spatial attention on value representation in the OFC.
• To determine how reward salience interacts with attentional modulation in the OFC.

Main Methods:

• Two monkeys were trained on a visual detection task with stimuli of varying reward values.
• Neuronal activity in the OFC and dorsolateral prefrontal cortex was recorded.
• Behavioral responses and neuronal data were analyzed to assess attention and value encoding.

Main Results:

• OFC neuronal responses were primarily driven by the stimulus with higher reward salience.
• The value of more salient stimuli was robustly encoded, while less salient stimuli had weak representation.
• Spatial attention, indicated by behavior and dorsolateral prefrontal cortex activity, did not significantly alter OFC value encoding.

Conclusions:

• Reward salience and spatial attention are distinctly processed within the prefrontal cortex.
• The OFC maintains a stable representation of reward value, largely independent of spatial attentional demands.