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Orthogonal representation of task-related information in theta phase-based multiple place fields of single units in the subiculum

View ORCID ProfileSu-Min Lee, Jae-Min Seol, View ORCID ProfileInah Lee
doi: https://doi.org/10.1101/2021.08.11.456028
Su-Min Lee
Department of Brain and Cognitive Sciences Seoul National University, Gwanak-ro 1, Gwanak-gu Seoul, Korea 08826
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Jae-Min Seol
Department of Brain and Cognitive Sciences Seoul National University, Gwanak-ro 1, Gwanak-gu Seoul, Korea 08826
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Inah Lee
Department of Brain and Cognitive Sciences Seoul National University, Gwanak-ro 1, Gwanak-gu Seoul, Korea 08826
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  • For correspondence: inahlee@snu.ac.kr
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Abstract

The subiculum is positioned at a critical juncture at the interface of the hippocampus with the rest of the brain. However, the exact roles of the subiculum in most hippocampal-dependent memory tasks remain largely unknown. One obstacle to make analytical comparisons of neural firing patterns between the subiculum and hippocampal CA1 is the broad firing fields of the subicular cells. Here, we used spiking phases in relation to theta rhythm to parse the broad firing field of a subicular neuron into multiple subfields to find the unique functional contribution of the subiculum while male rats performed a hippocampal-dependent visual scene memory task. Some of the broad firing fields of the subicular neurons were successfully divided into multiple subfields by using the theta-phase precession cycle. The resulting phase-based fields in the subiculum were more similar to those in CA1 in terms of the field size and phase-precession strength. The new method significantly improved the detection of task-relevant information in subicular cells without affecting the information content represented by CA1 cells. Notably, multiple fields of a single subicular neuron, unlike those in the CA1, could carry heterogeneous task-related information such as visual context and choice response. Our findings suggest that the subicular cells integrate multiple task-related factors by using theta rhythm to associate environmental context with action.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
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 August 12, 2021.
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Orthogonal representation of task-related information in theta phase-based multiple place fields of single units in the subiculum
Su-Min Lee, Jae-Min Seol, Inah Lee
bioRxiv 2021.08.11.456028; doi: https://doi.org/10.1101/2021.08.11.456028
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Orthogonal representation of task-related information in theta phase-based multiple place fields of single units in the subiculum
Su-Min Lee, Jae-Min Seol, Inah Lee
bioRxiv 2021.08.11.456028; doi: https://doi.org/10.1101/2021.08.11.456028

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