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Projections from neocortex mediate top-down control of memory retrieval.

Priyamvada Rajasethupathy1,2, Sethuraman Sankaran2, James H Marshel1

  • 1Department of Bioengineering, Stanford University, Stanford, California 94305, USA.

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Researchers discovered a direct brain pathway from the prefrontal cortex to the hippocampus, crucial for recalling memories. Stimulating this pathway triggers memory retrieval, revealing a new mechanism for how the brain accesses stored information.

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Top-down prefrontal cortex (PFC) projections to the hippocampus are implicated in memory and psychiatric disorders.
  • Direct PFC-hippocampal projections have not been previously identified or functionally characterized.

Purpose of the Study:

  • To identify and functionally characterize direct monosynaptic projections from the PFC to the hippocampus.
  • To investigate the role of these projections in memory retrieval mechanisms.

Main Methods:

  • Optogenetic stimulation of identified PFC-hippocampal projections in mice.
  • In vivo calcium imaging to observe neural activity in the hippocampus during memory retrieval.
  • Behavioral experiments using virtual reality environments to assess memory recall.

Main Results:

  • Discovery of a direct monosynaptic projection from the anterior cingulate cortex (a region of the PFC) to the CA3-CA1 region of the hippocampus (termed AC-CA projection).
  • Optogenetic activation of AC-CA projections successfully elicited contextual memory retrieval in mice.
  • Learning induced a sparse population of CA2/CA3 neurons that led network activity and were preferentially activated by AC-CA stimulation during retrieval.

Conclusions:

  • A direct top-down PFC-hippocampal pathway (AC-CA) plays a critical role in memory retrieval.
  • This pathway recruits specific, sparsely active hippocampal neurons to access stored memories.
  • Findings offer insights into neural mechanisms of memory recall and potential implications for psychiatric diseases.