Connectionists: REMINDER: World wide VVTNS series: Wednesday, May 22 at 11am (EDT), Yu Hu , Hong Kong University of Science and Technology | How random connections and motifs shape the covariance spectrum of recurrent network dynamics

[David Hansel]

[image: VVTNS.png]
https://www.wwtns.online - on twitter: wwtns at TheoreticalWide

You are cordially invited to the lecture given by

Yu Hu

Hong Kong University

of Science and Technology
on the topic of

"How random connections and motifs shape the covariance spectrum of
recurrent network dynamics*"*

The lecture will be held on zoom on *May 22, 2024*, at *11:00 am EDT *

To receive the zoom link: https://www.wwtns.online/register-page

*Abstract:  *Theoretical neuroscience aims to understand the relationship
between neuron dynamics and connectivity in recurrent circuits. This has
been intensively studied at the local level, where dynamics is described by
pairwise correlations. Recent advances in simultaneous recordings of many
neurons have allowed researchers to address the question at the global
level, such as for the dimensionality of population dynamics. Our work
contributes to this effort by analyzing the impact of connectivity
statistics, including certain motifs, on the bulk and outlier covariance
eigenvalues. By considering linearized dynamics around a steady state, we
obtained analytically the covariance spectrum which exhibits a signature
long tail robust to model variants and matches zebrafish calcium imaging
data. This provides a local circuit mechanism for shaping the geometry of
population dynamics and a quantitative benchmark for interpreting data.

*About VVTNS : Created as the World Wide Neuroscience Seminar (WWTNS) in
November 2020 and renamed in homage to Carl van Vreeswijk in Memoriam
(April 20, 2022), its aim is to be a platform to exchange ideas among
theoreticians. 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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