Origin of Gamma Frequency Power during Hippocampal Sharp-Wave Ripples.

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 Rep

journal_title

Cell reports

authors

Oliva A,Fernández-Ruiz A,Fermino de Oliveira E,Buzsáki G

doi

10.1016/j.celrep.2018.10.066

subject

Has Abstract

pub_date

2018-11-13 00:00:00

pages

1693-1700.e4

issue

7

issn

2211-1247

pii

S2211-1247(18)31670-X

journal_volume

25

pub_type

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