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Working memory features are embedded in hippocampal place fields.

Viktor Varga1, Peter Petersen2, Ipshita Zutshi3

  • 1Neuroscience Institute, Langone Health, New York University, New York, NY, USA; Subcortical Modulation Research Group, Institute of Experimental Medicine - Hungarian Research Network, Budapest, Hungary.

Cell Reports
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

Hippocampal neurons exhibit flexible "splitter" features, varying across trials and spatial positions. These findings suggest spatial tuning and memory functions are intertwined aspects of hippocampal computation.

Keywords:
CP: Neuroscienceassemblycontexthippocampusmedial entorhinal cortexspatial alternationsplitterworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Hippocampal principal neurons are known for spatial tuning and memory functions.
  • The relationship between these functions (e.g., place fields vs. splitter features) is debated, with possibilities including distinct neuron types or a continuum.

Purpose of the Study:

  • To investigate whether spatial tuning and task-context (
  • splitter
  • ) features represent separate neuron types or a context-dependent continuum in hippocampal neurons.
  • To elucidate the dynamic nature and underlying mechanisms of these neuronal features.

Main Methods:

  • Recording from hippocampal principal neurons and interneurons in behaving animals.
  • Analyzing neuronal activity in relation to spatial position and behavioral choices.
  • Utilizing bilateral optogenetic inactivation of the medial entorhinal cortex.

Main Results:

  • Splitter
  • features were highly variable across trials and spatial positions, independent of place field stability.
  • Individual neurons exhibited multiple place fields encoding different trajectories, suggesting control by neuronal assembly activity.
  • Place fields differentiated into subfields based on behavioral choices, with dynamic evolution across trials.
  • Interneurons integrated inputs from pyramidal cells to differentiate choices.
  • Medial entorhinal cortex inactivation reversibly reduced the proportion of
  • splitter
  • fields.

Conclusions:

  • Spatial tuning (place fields) and task-context selectivity (
  • splitter
  • features) are not distinct properties but rather different manifestations of the same hippocampal computation.
  • Neuronal assembly activity and behavioral context dynamically shape hippocampal representations.