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In Vivo Characterization of Neurophysiological Diversity in the Lateral Supramammillary Nucleus during Hippocampal Sharp-wave Ripples of Adult Rats
In Vivo Characterization of Neurophysiological Diversity in the Lateral Supramammillary Nucleus during Hippocampal Sharp-wave Ripples of Adult Rats-2020 The extent of the networks that control the genesis and modulation of hippocampal sharp-wave ripples
(SPW-Rs), which are involved in memory consolidation, remains incompletely understood. Here, we performed a
detailed in vivo analysis of single cell firing in the lateral supramammillary nucleus (lSuM) during theta and slow
oscillations, including SPW-Rs, in anesthetized rats. We classified neurons as SPW-R-active and SPW-Runchanged
according to whether or not they increased their firing during SPW-Rs. We show that lSuM SPW-Ractive
neurons increase their firing prior to SPW-Rs peak power and prior to hippocampal excitatory cell activation.
Moreover, lSuM SPW-R-active neurons show increased firing activity during theta and slow oscillations as
compared to unchanged neurons. These results suggest that a sub-population of lSuM neurons can interact
with the hippocampus during SPW-Rs, raising the possibility that the lSuM may modulate memory consolidation.
2020 IBRO. Published by Elsevier Ltd. All rights reserved. Key words: hippocampus | lateral supramammillary nucleus | sharp-wave ripple | firing | theta | slow oscillation |
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