What makes high-dimensional networks produce low-dimensional activity?

What makes high-dimensional networks produce low-dimensional activity?

Date Posted: 

September 21, 2018

Date Recorded: 

September 21, 2018

Speaker(s): 

Eric Shea-Brown, University of Washington
  • All Captioned Videos
  • Brains, Minds and Machines Seminar Series

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Description: 

Abstract:  There is an avalanche of new data on the brain’s activity, revealing the collective dynamics of vast numbers of neurons.  In principle, these collective dynamics can be of almost arbitrarily high dimension, with many independent degrees of freedom — and this may reflect powerful capacities for general computing or information.  In practice, datasets reveal a range of outcomes, including collective dynamics of much lower dimension — and this may reflect the structure of tasks or latent variables.  For what networks does each case occur? Our contribution to the answer is a new framework that links tractable statistical properties of network connectivity with the dimension of the activity that they produce.  I’ll describe where we have succeeded, where we have failed, and the many avenues that remain.

Short Bio: Eric Shea-Brown is a professor at the University of Washington Applied Mathematics Department, an affiliate investigator at the Allen Institute for Brain Science, and is adjunct faculty in the Department of Physiology and Biophysics and a member of the Program in Neuroscience.