Connectionists: World wide VVTNS series (fifth season): Wednesday, February 26, 2025, at 11:00 am EST| Songting Li, Shanghai Jiao Tong University

[David Hansel]

[image: VVTNS.png]
https://www.wwtns.online
<https://streaklinks.com/A9c7PbbpKY7PxB6PaAJWGD3-/https%3A%2F%2Fwww.wwtns.online>
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on twitter: wwtns at TheoreticalWide

You are cordially invited to the lecture given by

Songting Li

Shanghai Jiao Tong University

Timescale localization and signal propagation

in the large-scale cortical network


The lecture will be held on zoom on Wednesday, February 26, 2025, at *11:00
am EST *
To receive the link: https://www.wwtns.online/register-page

*Abstract: * In the brain, while early sensory areas encode and process
external inputs rapidly, higher-association areas are endowed with slow
dynamics to benefit information accumulation over time. This property
raises the question of why diverse timescales are well localized rather
than being mixed up across the cortex, despite high connection density and
an abundance of feedback loops that support reliable signal propagation. In
this talk, we will address this question by analyzing a large-scale network
model of the primate cortex, and we identify a novel dynamical regime
termed "interference-free propagation". In this regime, the mean components
of the synaptic currents to each downstream area are imbalanced to ensure
signals to propagate reliably, while the temporally fluctuating components
of the synaptic inputs governed by upstream areas' timescales are largely
canceled out, leading to the localization of its own timescale in each
downstream area. Our result provides new insights into the operational
regime of the cortex, leading to the coexistence of hierarchical timescale
localization and reliable signal propagation.

*About VVTNS : Launched as the World Wide  Theoretical Neuroscience Seminar
(WWTNS) in November 2020 and renamed in homage to Carl van Vreeswijk in
Memoriam (April 20, 2022), Speakers have the occasion to talk about
theoretical aspects of their work which cannot be discussed in a setting
where the majority of the audience consists of experimentalists. The
seminars, **held on Wednesdays at 11 am ET,**  are 45-50 min long followed
by a discussion. The talks are recorded with authorization of the speaker
and are available to everybody on our YouTube channel.*
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