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Related Experiment Videos

Hippocampal area CA1 and remote memory in rats.

Amber C Ocampo1, Larry R Squire2,3, Robert E Clark2,4

  • 1Department of Psychology, University of California, San Diego, La Jolla, California 92093, USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|October 18, 2017
PubMed
Summary

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Discrete CA1 hippocampal lesions in rodents similarly impaired recent and remote memory across multiple tasks, challenging the systems consolidation theory of memory storage.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Memory Research

Background:

  • Hippocampal lesions typically cause temporally graded retrograde amnesia (TGRA), supporting systems consolidation.
  • However, TGRA is inconsistently observed in tasks like the watermaze and context fear conditioning.
  • Large hippocampal lesions may indirectly affect memory via retrograde degeneration of connected areas.

Purpose of the Study:

  • To investigate the role of the CA1 subfield, the hippocampus's main cortical output, in memory consolidation.
  • To examine the effects of discrete CA1 lesions on recent and remote memory in multiple learning paradigms.

Main Methods:

  • Created discrete lesions specifically targeting the CA1 area of the hippocampus.
  • Assessed recent and remote memory performance using the watermaze, context fear conditioning, and trace fear conditioning tasks.

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Main Results:

  • CA1 lesions resulted in similar impairments of both recent and remote memory across all tested tasks.
  • This finding contrasts with the expected TGRA pattern observed with broader hippocampal damage.

Conclusions:

  • The results suggest that the CA1 region's function is critical for both recent and remote memory, independent of temporal grading.
  • These findings challenge the traditional view of systems consolidation where the hippocampus is solely involved in initial memory encoding and recent storage.