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The ventral dentate gyrus mediates pattern separation for reward value.

Ryan A Kirk1, Sarah N Redmon1, Raymond P Kesner1

  • 1Department of Psychology, University of Utah.

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Summary

Ventral dentate gyrus (DG) lesions in rats impaired their ability to adjust running speed based on reward changes, suggesting the ventral DG is crucial for reward-based decision-making.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • The hippocampus, particularly the dentate gyrus (DG), is implicated in memory and spatial navigation.
  • The ventral DG subregion's specific role in reward processing and decision-making remains less understood.

Purpose of the Study:

  • To investigate the role of the ventral dentate gyrus (DG) in pattern separation related to reward value.
  • To determine if lesions to the ventral DG affect behavioral responses to changes in reward magnitude.

Main Methods:

  • Rats with ventral DG lesions, sham lesions, and controls were trained on a runway task with a 20-pellet reward.
  • After reaching asymptotic running speed, reward size was reduced to 1, 9, or 17 pellets.
  • Running velocities were measured to assess behavioral adjustments.

Main Results:

  • Control and sham-lesioned rats showed a graded decrease in running speed corresponding to reduced reward values, indicating pattern separation.
  • Ventral DG-lesioned rats maintained high running speeds irrespective of reward magnitude changes.
  • These deficits were not attributed to hyperactivity and suggest a role in reward prediction.

Conclusions:

  • The ventral DG is essential for processing reward value and adjusting behavior accordingly.
  • Lesions in the ventral DG disrupt decision-making processes related to goal-relevant outcomes.
  • Findings support the ventral DG's involvement in a neural circuit for predicting reward outcomes.