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Schemas provide a scaffold for neocortical integration of new memories over time

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  • Sam Audrain

    (University Health Network
    University of Toronto)

  • Mary Pat McAndrews

    (University Health Network
    University of Toronto)

Abstract

Memory transformation is increasingly acknowledged in theoretical accounts of systems consolidation, yet how memory quality and neural representation change over time and how schemas influence this process remains unclear. We examined the behavioral quality and neural representation of schema-congruent and incongruent object-scene pairs retrieved across 10-minutes and 72-hours using fMRI. When a congruent schema was available, memory became coarser over time, aided by post-encoding coupling between the anterior hippocampus and medial prefrontal cortex (mPFC). Only schema-congruent representations were integrated in the mPFC over time, and were organized according to schematic context. In the hippocampus, pattern similarity changed across 72-hours such that the posterior hippocampus represented specific details and the anterior hippocampus represented the general context of specific memories, irrespective of congruency. Our findings suggest schemas are used as a scaffold to facilitate neocortical integration of congruent information, and illustrate evolution in hippocampal organization of detailed contextual memory over time.

Suggested Citation

  • Sam Audrain & Mary Pat McAndrews, 2022. "Schemas provide a scaffold for neocortical integration of new memories over time," Nature Communications, Nature, vol. 13(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33517-0
    DOI: 10.1038/s41467-022-33517-0
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    Cited by:

    1. Catherine R. Walsh & Jesse Rissman, 2023. "Behavioral representational similarity analysis reveals how episodic learning is influenced by and reshapes semantic memory," Nature Communications, Nature, vol. 14(1), pages 1-16, December.

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