Distinct cortical-amygdala projections drive reward value encoding and retrieval.

Area of Science:

• Neuroscience
• Decision Science
• Behavioral Economics

Background:

• The brain mechanisms underlying the valuation and pursuit of anticipated rewards are not fully understood.
• Understanding these circuits is vital for addressing psychiatric disorders characterized by reward processing deficits.

Purpose of the Study:

• To elucidate the neural networks responsible for encoding and retrieving the incentive value of rewards.
• To investigate the roles of the basolateral amygdala (BLA) and orbitofrontal cortex (OFC) in reward valuation.

Main Methods:

• Utilized biosensors and pharmacological manipulations to monitor and alter neural activity.
• Employed projection-specific chemogenetic and optogenetic techniques to manipulate OFC-BLA pathways.
• Investigated the encoding and retrieval of state-dependent incentive value for palatable food rewards.

Main Results:

• Basolateral amygdala (BLA) glutamatergic activity was found to track and mediate the encoding and retrieval of reward value.
• Orbitofrontal cortex (OFC) projections to the BLA were shown to support these valuation processes.
• Ventrolateral and medial OFC→BLA projections exhibited a double dissociation: lateral OFC→BLA for encoding, and medial OFC→BLA for retrieval of reward value.

Conclusions:

• A novel circuit involving the OFC and BLA has been identified for adaptive reward valuation and pursuit.
• Specific OFC subregions differentially contribute to the encoding and retrieval of reward memories.
• These findings offer insights into the neural basis of reward dysfunction in psychiatric diseases.