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Replay as wavefronts and theta sequences as bump oscillations in a grid cell attractor network

View ORCID ProfileLouis Kang, Michael R DeWeese
doi: https://doi.org/10.1101/565440
Louis Kang
University of California, Berkeley
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  • For correspondence: louis.kang@berkeley.edu
Michael R DeWeese
University of California, Berkeley
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  • For correspondence: deweese@berkeley.edu
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Abstract

Grid cells fire in sequences that represent rapid trajectories in space. During locomotion, theta sequences encode sweeps in position starting slightly behind the animal and ending ahead of it. During quiescence and slow wave sleep, bouts of synchronized activity represent long trajectories called replays, which are well-established in place cells and have been recently reported in grid cells. Theta sequences and replay are hypothesized to facilitate many cognitive functions, but their underlying mechanisms are unknown. A leading mechanism proposed for grid cell formation is the continuous attractor network. We demonstrate that this established architecture naturally produces theta sequences and replay as distinct consequences of modulating external input. Driving inhibitory interneurons at the theta frequency causes attractor bumps to oscillate in speed and size, which gives rise to theta sequences and phase precession, respectively. Decreasing input drive to all neurons produces traveling wavefronts of activity that are decoded as replays.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 01, 2019.
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Replay as wavefronts and theta sequences as bump oscillations in a grid cell attractor network
Louis Kang, Michael R DeWeese
bioRxiv 565440; doi: https://doi.org/10.1101/565440
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Replay as wavefronts and theta sequences as bump oscillations in a grid cell attractor network
Louis Kang, Michael R DeWeese
bioRxiv 565440; doi: https://doi.org/10.1101/565440

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