Spatial encoding in dorsomedial prefrontal cortex and hippocampus is related during deliberation

Area of Science:

• Neuroscience
• Cognitive Science
• Decision-Making Research

Background:

• Deliberation involves simulating action outcomes, valuing them, and selecting the best option.
• Prefrontal cortex (PFC) and hippocampus (HPC) are known to be involved in deliberation.
• The precise mechanisms of prospective information processing and action selection in these areas remain unclear.

Purpose of the Study:

• To investigate the relationship between spatial and reward encoding in the dmPFC and dorsal HPC during deliberation.
• To understand how these brain regions process prospective information for decision-making.

Main Methods:

• Simultaneous electrophysiological recordings from dmPFC and CA1 of the dorsal HPC in rats.
• Analysis of neural ensemble activity during a spatial contingency switching task.
• Examination of spatial and reward representations at the choice point during deliberation.

Main Results:

• Both CA1 and dmPFC simultaneously encoded current position or goal locations.
• dmPFC ensemble activity predicted HPC goal location encoding on a timescale of seconds.
• Reward encoding in dmPFC was enhanced during HPC goal location representations within theta cycles.

Conclusions:

• dmPFC and HPC share prospective information during deliberation.
• dmPFC may modulate HPC's representation of prospective information.
• HPC-recalled goal information is integrated into dmPFC reward representations rapidly.