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The dorsal hippocampus (dHPC) pathway to the nucleus accumbens (NAc) is crucial for spatial memory and reward-seeking behaviors. This specific neural circuit enhances navigation and action selection by integrating spatial and behavioral cues.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • The dorsal hippocampus (dHPC) is vital for spatial memory, while the nucleus accumbens (NAc) mediates value-based decisions.
  • The information flow from dHPC to NAc and its role in behavior are not well understood.

Purpose of the Study:

  • To investigate the information content of the dHPC→NAc pathway.
  • To determine the acute role of dHPC→NAc signaling in spatial memory and appetitive behaviors.

Main Methods:

  • Optogenetic stimulation of the dHPC→NAc pathway in mice during navigation tasks.
  • In vivo dual-color two-photon imaging of NAc-projecting hippocampal neurons (dHPC→NAc).
  • Generalized linear modeling to analyze neural coding properties.

Main Results:

  • dHPC→NAc pathway stimulation was necessary and sufficient for spatial memory-driven appetitive behaviors.
  • The dHPC→NAc subpopulation exhibited enriched spatial tuning and coded non-spatial behaviors like deceleration and licking.
  • Enhanced conjunctive coding in dHPC→NAc neurons improved reward zone identification.

Conclusions:

  • The dHPC→NAc pathway transmits critical spatial and behavioral state information.
  • This pathway guides nucleus accumbens action selection for reward-seeking.
  • Specific hippocampal subpopulations play distinct roles in memory-guided behavior.