A diversity of interneurons and Hebbian plasticity facilitate rapid compressible learning in the hippocampus

Nat Neurosci. 2019 Jul;22(7):1168-1181. doi: 10.1038/s41593-019-0415-2. Epub 2019 Jun 24.

Abstract

The hippocampus is able to rapidly learn incoming information, even if that information is only observed once. Furthermore, this information can be replayed in a compressed format in either forward or reverse modes during sharp wave-ripples (SPW-Rs). We leveraged state-of-the-art techniques in training recurrent spiking networks to demonstrate how primarily interneuron networks can achieve the following: (1) generate internal theta sequences to bind externally elicited spikes in the presence of inhibition from the medial septum; (2) compress learned spike sequences in the form of a SPW-R when septal inhibition is removed; (3) generate and refine high-frequency assemblies during SPW-R-mediated compression; and (4) regulate the inter-SPW interval timing between SPW-Rs in ripple clusters. From the fast timescale of neurons to the slow timescale of behaviors, interneuron networks serve as the scaffolding for one-shot learning by replaying, reversing, refining, and regulating spike sequences.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • CA3 Region, Hippocampal / physiology*
  • Computer Simulation*
  • Interneurons / physiology*
  • Learning / physiology*
  • Memory / physiology
  • Neural Networks, Computer*
  • Neuronal Plasticity / physiology*
  • Septal Nuclei / physiology
  • Time Factors