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CATEGORIES:Colloquia / Seminar / Lecture
DESCRIPTION:The ability to simultaneously monitor hundreds to thousands of 
 neurons in the brain is enabling an experimental shift of attention from th
 e activity of single cells (which\, until recently\, was usually measured a
 s a function of external correlates)\, to the internal dynamics of large ne
 ural populations. One of the most striking outcomes of this recent developm
 ent is observed in brain areas that represent an animal’s position in its e
 nvironment\, where neural populations have been observed to robustly expres
 s activity patterns that reside on low-dimensional nonlinear manifolds\, in
  agreement with theories that were put forth in the past several decades. I
 n the grid cell system\, found in the entorhinal cortex of mammals\, single
  cells are active in multiple spatial locations that are arranged periodica
 lly on a hexagonal lattice. Cells are functionally arranged in so-called mo
 dules: within a module\, grid cells share the same spacing of their periodi
 c spatial responses.  Very recently\, it was shown that grid cells within a
  module robustly express activity patterns that reside on a two-dimensional
  manifold with toroidal topology. I will focus on the joint dynamics of neu
 ral activity in multiple grid cell modules: we recently found that differen
 t modules tightly coordinate their activity even when the brain’s internal 
 representation of position is dissociated from the true position of the ani
 mal. I will present the evidence for this coordination\, based on simultane
 ous recordings of hundreds of grid cells in animals that were foraging in t
 he dark. I will also discuss theories for how this coordination might be im
 plemented by neural circuitry in the brain.
DTEND:20211021T200000Z
DTSTAMP:20260411T111526Z
DTSTART:20211021T190000Z
LOCATION:
SEQUENCE:0
SUMMARY:Dynamics of spatial representation by attractor networks in the ent
 orhinal cortex
UID:tag:localist.com\,2008:EventInstance_37955868229721
URL:https://events.seas.harvard.edu/event/yoram_burak_associate_professor_o
 f_elsc_hebrew_university_of_jerusalem
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