Memory traces bias new learning for hippocampal generalization

In hippocampal CA1 of mice, residual activity linked to generalization biases which neurons form place fields and where, via BTSP during new learning.

• Why it matters: Generalizing prior experience is essential for adapting to novel settings, but the hippocampal mechanisms that translate past structure into new representations are unclear.
• What they did: Mice underwent longitudinal imaging across environments with shared task structure, alongside modeling and circuit perturbations; spatially informative residual activity was tied to BTSP and network alignment, and CA1 chemogenetic suppression during training reduced these measures.
• The result: Suppressing local CA1 during training lowered residual activity, BTSP induction, place cell recruitment, and generalization, showing memory traces shape new PF formation and population dynamics for hippocampal generalization.

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