[CTN] CTN seminar: Wilten Nicola (University of Calgary): 3:30 Oct 8, E5 2004

[Bryan Tripp]

Hi everyone,

Please join us for the next CTN talk with Prof. Wilten Nicola (details
below). Some of you will remember this speaker from his time as a student
at the University of Waterloo. He has since been at Imperial College London
as a post-doc, and is now at the University of Calgary. He will be
presenting work from this astonishing paper:
https://www.nature.com/articles/s41593-019-0415-2

Bryan


Fast, Compressible Learning in the Hippocampus using Interneuron Sequences
Wilten Nicola, University of Calgary

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.
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