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Place cell firing cannot support navigation without intact septal circuits

Place cell firing cannot support navigation without intact septal circuits Though it has been known for over half a century that interference with the normal activity of septohippocampal neurons can abolish hippocampal theta rhythmicity, a definitive answer to the question of its function has remained elusive. To clarify the role of septal circuits and theta in location‐specific activity of place cells and spatial behavior, three drugs were delivered to the medial septum of rats: Tetracaine, a local anesthetic; muscimol, a GABA‐A agonist; and gabazine, a GABA‐A antagonist. All three drugs disrupted normal oscillatory activity in the hippocampus. However, tetracaine and muscimol both reduced spatial firing and interfered with the rat's ability to navigate to a hidden goal. After gabazine, location‐specific firing was preserved in the absence of theta, but rats were unable to accurately locate the hidden goal. These results indicate that theta is unnecessary for location‐specific firing of hippocampal cells, and that place cell activity cannot support accurate navigation when septal circuits are disrupted. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hippocampus Wiley

Place cell firing cannot support navigation without intact septal circuits

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References (72)

Publisher
Wiley
Copyright
© 2020 Wiley Periodicals, Inc.
ISSN
1050-9631
eISSN
1098-1063
DOI
10.1002/hipo.23136
Publisher site
See Article on Publisher Site

Abstract

Though it has been known for over half a century that interference with the normal activity of septohippocampal neurons can abolish hippocampal theta rhythmicity, a definitive answer to the question of its function has remained elusive. To clarify the role of septal circuits and theta in location‐specific activity of place cells and spatial behavior, three drugs were delivered to the medial septum of rats: Tetracaine, a local anesthetic; muscimol, a GABA‐A agonist; and gabazine, a GABA‐A antagonist. All three drugs disrupted normal oscillatory activity in the hippocampus. However, tetracaine and muscimol both reduced spatial firing and interfered with the rat's ability to navigate to a hidden goal. After gabazine, location‐specific firing was preserved in the absence of theta, but rats were unable to accurately locate the hidden goal. These results indicate that theta is unnecessary for location‐specific firing of hippocampal cells, and that place cell activity cannot support accurate navigation when septal circuits are disrupted.

Journal

HippocampusWiley

Published: Mar 1, 2020

Keywords: ; ; ; ;

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