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Theta-associated high-frequency oscillations (110-160 Hz) in the hippocampus and neocortex

We review recent evidence for a novel type of fast cortical oscillatory activity that occurs circumscribed between 110 and 160Hz, which we refer to as high-frequency oscillations (HFOs). HFOs characteristically occur modulated by theta phase in the hippocampus and neocortex. HFOs can co-occur with g...

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Weitere Verfasser: Tort, Adriano B. L. (BerichterstatterIn) , Draguhn, Andreas (BerichterstatterIn) , Brankačk, Jurij (BerichterstatterIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: January 2013
In: Progress in neurobiology
Year: 2013, Jahrgang: 100, Pages: 1-14
ISSN:1873-5118
DOI:10.1016/j.pneurobio.2012.09.002
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.pneurobio.2012.09.002
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0301008212001487
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0301008212001487
Volltext
Verfasserangaben:Adriano B.L. Tort, Robson Scheffer-Teixeira, Bryan C. Souza, Andreas Draguhn, Jurij Brankačk

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520 |a We review recent evidence for a novel type of fast cortical oscillatory activity that occurs circumscribed between 110 and 160Hz, which we refer to as high-frequency oscillations (HFOs). HFOs characteristically occur modulated by theta phase in the hippocampus and neocortex. HFOs can co-occur with gamma oscillations nested in the same theta cycle, in which case they typically peak at different theta phases. Despite the overlapping frequency ranges, HFOs differ from hippocampal ripple oscillations in some key characteristics, including amplitude, region of occurrence, associated behavioral state, and activity time-course (sustained vs intermittent). Recent in vitro evidence suggests that HFOs depend on fast GABAergic transmission and may also depend on axonal gap junctions. The functional role of HFOs is currently unclear. Both hippocampal and neocortical theta-HFO coupling increase during REM sleep, suggesting a role for HFOs in memory processing. 
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