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Keyword: mossy fibers ×Clear all

2 claims from 1 paper

1. Neuroscience › Memory and Neural Mechanisms

   Dentate gyrus amplifies rate-based coding while sparing global remapping across the CA3 transverse axis

   Hu, Duan, Long, Cai and Lu · bioRxiv (Cold Spring Harbor Laboratory) · 2025

   Rats with selective dentate gyrus lesions were recorded across the CA3 axis, and the authors report that the DG supports fine rate-based context coding but is not needed for global remapping.

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   1. UncheckedIn rats, CA3 still remapped globally after dentate gyrus lesions, but rate-based coding of context weakened, most in proximal CA3 and less distally.“Global remapping in CA3 remained robust following DG lesion, whereas rate-based contextual coding was substantially attenuated, most strongly in proximal CA3 and attenuating distally, paralleling mossy-fiber topography.”
   2. UncheckedIn rats, the dentate gyrus boosts rate-based context coding in proximal CA3, while large, categorical context changes are signalled without it.“These data causally link the enhanced rate coding of proximal CA3 to its preferential DG innervation and support a dual organization of contextual discrimination: categorical changes in environmental identity are signaled independently of the DG, whereas fine-grained discrimination is facilitated b…”