Theta and gamma hippocampal–neocortical oscillations during the episodic-like memory test: Impairment in epileptogenic rats

Malkov, Anton; Shevkova, Liudmila; Latyshkova, Alexandra; Kitchigina, Valentina F.

doi:10.1016/j.expneurol.2022.114110

Cited by 9 publications

(1 citation statement)

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“…These conflicting results may originate from differences in experimental protocols and from a poor understanding of their biophysical underpinnings. Among such mechanisms, the involvement of hippocampal theta oscillations (4-12 Hz) and their interactions with higher-frequency gamma oscillations (30-120 Hz) in memory-related processes has been reported in multiple studies ( Lisman et al, 2005 ; de Almeida et al, 2007 ; Lega et al, 2012 ; Lin et al, 2017 ; Malkov et al, 2022 ; Abbaspoor et al, 2023 ). Moreover, the modulation of gamma oscillations by the phase of theta oscillations in hippocampal circuits, a phenomenon termed theta-gamma phase-amplitude coupling (PAC), correlates with the efficacy of memory encoding and retrieval ( Jensen and Colgin, 2007 ; Tort et al, 2009 ; Canolty and Knight, 2010 ; Axmacher et al, 2010 ; Fell and Axmacher, 2011 ; Lisman and Jensen, 2013 ; Lega et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

A dynamical computational model of theta generation in hippocampal circuits to study theta-gamma oscillations during neurostimulation

Vardalakis

Aussel

Rougier

et al. 2023

Preprint

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Neurostimulation of the hippocampal formation has shown promising results for modulating memory but the underlying mechanisms remain unclear. In particular, the effects on hippocampal theta-nested gamma oscillations and theta phase reset, which are both crucial for memory processes, are unknown. Moreover, these effects cannot be investigated using current computational models, which consider theta oscillations with a fixed amplitude and phase velocity. Here, we developed a novel computational model that includes the medial septum, represented as a set of abstract Kuramoto oscillators producing a dynamical theta rhythm with phase reset, and the hippocampal formation, composed of biophysically-realistic neurons and able to generate theta-nested gamma oscillations under theta drive. We showed that this system can exhibit bistability in a specific range of parameters and that a single stimulation pulse could switch the network behavior from non-oscillatory to a state producing theta-nested gamma oscillations. Next, we demonstrated that for a theta input too weak to generate theta-nested gamma oscillations, pulse train stimulation at the theta frequency could restore seemingly physiological oscillations. Importantly, the presence of phase reset influenced whether these two effects depended on the phase at which stimulation onset was delivered, which has practical implications for designing neurostimulation protocols that are triggered by the phase of ongoing theta oscillations. This novel model opens new avenues for studying the effects of neurostimulation on the hippocampal formation. Furthermore, our hybrid approach that combines different levels of abstraction could be extended in future work to other neural circuits that produce dynamical brain rhythms.

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