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An emergent neural coactivity code for dynamic memory.

Mohamady El-Gaby1,2, Hayley M Reeve3, Vítor Lopes-Dos-Santos3

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Neural coactivity in the hippocampus, not just individual neuron firing, encodes short-term behaviors. This neural coactivity is crucial for memory retrieval and learning.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Neural activity encodes external variables guiding behavior.
  • The role of higher-order neural features like multineuron coactivity in encoding remains unclear.

Purpose of the Study:

  • Investigate if millisecond-timescale coactivity among hippocampal neurons encodes behavioral contingencies.
  • Determine if coactivity plays a primary or secondary role in neural coding.

Main Methods:

  • Recorded neural activity from hippocampal CA1 neurons.
  • Analyzed millisecond-timescale coactivity patterns.
  • Used optogenetics to suppress CA3 inputs during learning.

Main Results:

  • Hippocampal CA1 neuron coactivity discriminated distinct behavioral contingencies.
  • Contingency discrimination was an emergent property of coactivity, independent of individual neuron tuning.
  • Offline reactivation of contingency-discriminating patterns predicted memory performance.
  • Suppression of CA3 inputs impaired coactivity-based information and memory retrieval.

Conclusions:

  • Millisecond-timescale neural coactivity is a primary neural code for behaviorally relevant variables.
  • Coactivity is essential for memory retrieval and dynamic memory processes.