Functional Connectivity Between Human Hippocampus and Orbitofrontal Cortex Supports Inference-Based Decision Making.

Area of Science:

• Neuroscience
• Cognitive Science
• Decision Making

Background:

• Cognitive maps, internal representations of relationships, aid decision-making using past experiences.
• The hippocampus (HIP) and orbitofrontal cortex (OFC) are implicated in cognitive mapping.
• The precise interaction between HIP and OFC during inference-based decisions remains unclear.

Purpose of the Study:

• To investigate the neural mechanisms underlying inference-based decision-making.
• To examine the interaction between the hippocampus and orbitofrontal cortex during cognitive mapping.
• To elucidate how HIP-OFC connectivity supports novel decisions based on learned hierarchical relationships.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan healthy adults performing an inference task.
• Participants utilized learned hierarchical relationships to make novel decisions.
• Beta-series correlation analysis was employed to assess functional connectivity between brain regions.

Main Results:

• The hippocampus and orbitofrontal cortex were found to represent cognitive maps in social space.
• Inference-based decisions correlated with increased connectivity between the HIP and OFC.
• HIP- and OFC-seeded correlation maps revealed widespread network engagement, including visual, prefrontal, and medial temporal areas.

Conclusions:

• The interaction between the hippocampus and orbitofrontal cortex plays a crucial role in supporting inference-based decisions.
• Cognitive mapping involves a distributed network coordinated by HIP-OFC interactions.
• This study enhances understanding of the neural basis of decision-making and cognitive representation.