Abstract:
:Hippocampal sharp-wave ripples (SPW-Rs) support consolidation of recently acquired episodic memories and planning future actions by generating ordered neuronal sequences of previous or future experiences. SPW-Rs are characterized by several spectral components: a slow (5-15 Hz) sharp-wave, a high-frequency "ripple" oscillation (150-200 Hz), and a slow "gamma" oscillation (20-40 Hz). Using laminar hippocampal recordings and optogenetic manipulations, we dissected the origin of these spectral components. We show that increased power in the 20-40 Hz band does not reflect an entrainment of CA1 and CA3 neurons at gamma frequency but the power envelope of overlapping ripples. Spike-local field potential coupling between unit firing in CA1 and CA3 regions during SPW-Rs is lowest in the gamma band. Longer SPW-Rs are preceded by increased firing in the entorhinal cortex. Thus, fusion of SPW-Rs leads to lengthening of their duration associated with increased power in the slow gamma band without the presence of true oscillation.
journal_name
Cell Repjournal_title
Cell reportsauthors
Oliva A,Fernández-Ruiz A,Fermino de Oliveira E,Buzsáki Gdoi
10.1016/j.celrep.2018.10.066subject
Has Abstractpub_date
2018-11-13 00:00:00pages
1693-1700.e4issue
7issn
2211-1247pii
S2211-1247(18)31670-Xjournal_volume
25pub_type
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