Identity-Specific Reward Representations in Orbitofrontal Cortex Are Modulated by Selective Devaluation.

Area of Science:

• Neuroscience
• Cognitive Science
• Decision Science

Background:

• Goal-directed behavior relies on evaluating expected outcomes.
• Orbitofrontal cortex (OFC) is crucial for representing specific reward values.
• Mechanisms for updating goals and choices in the brain remain unclear.

Purpose of the Study:

• To investigate how the brain updates specific reward representations based on satiety.
• To explore the role of the OFC in dynamically adjusting reward value.
• To understand how these updates translate into goal-directed choices.

Main Methods:

• Selective devaluation of food odors in hungry participants.
• Pattern-based functional magnetic resonance imaging (fMRI).
• A decision-making task assessing odor choices before and after a meal.

Main Results:

• Participants shifted choices away from sated odors and towards nonsated odors after a meal.
• fMRI patterns in the lateral posterior OFC reflected altered representations of the sated odor.
• Functional connectivity between OFC and ventromedial prefrontal cortex (vmPFC) predicted choice behavior.

Conclusions:

• The OFC flexibly updates specific reward representations through devaluation.
• Connectivity between OFC and vmPFC signals current outcome value, guiding behavior.
• This study elucidates a neural mechanism for adaptive goal-directed decision-making.