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A core ensemble of medial prefrontal cortex neurons maintains stable, trajectory-specific tuning during a spatial memory task, suggesting a neural basis for consistent behavior over time.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • Behavioral consistency over time is well-documented, but the underlying neural mechanisms, specifically the stability of neuronal responses to task features, remain debated.
  • The question of whether neuronal representations drift or remain stable is critical for understanding long-term memory and consistent task performance.

Purpose of the Study:

  • To investigate the stability of neuronal responses in the medial prefrontal cortex (mPFC) during a long-term spatial memory task.
  • To determine if neuronal ensembles maintain consistent tuning to task-relevant features over extended periods.

Main Methods:

  • Utilized an olfaction-guided spatial memory task in mice.
  • Recorded neuronal activity from a persistently active ensemble in the mPFC.
  • Analyzed neuronal tuning to specific trajectories and task features over several weeks.

Main Results:

  • Identified a stable ensemble of mPFC neurons exhibiting trajectory-specific tuning.
  • Demonstrated minimal representational drift in these neurons despite long pauses in task exposure.
  • Showed maintained tuning across repeated changes in cue-target associations.

Conclusions:

  • A 'core ensemble' of mPFC neurons forms a stable reference frame for task-relevant spatial information.
  • This stable neural representation supports consistent behavioral performance over extended durations.
  • Suggests a neural mechanism for long-term behavioral consistency potentially independent of continuous task engagement.