Delta Rhythms: Models and Physiology

Traub, Roger D.; Whittington, Miles A.

doi:10.1007/978-1-0716-1006-0_305

Cited by 1 publication

(1 citation statement)

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“…Models of memory-related theta-gamma oscillations in the hippocampal formation have been developed across different resolution levels, ranging from abstract mean-field approaches ( Traub et al, 1997 ; Onslow et al, 2014 ; Segneri et al, 2020 ) to biophysically-realistic conductance-based models ( Lundqvist et al, 2006 ; Herman et al, 2013 ; Aussel et al, 2018 ). Neural masses, which represent the mean activity of a neuronal population, can generate gamma oscillations through reciprocal interactions between an excitatory and inhibitory population ( Traub et al, 1997 ; Onslow et al, 2014 ), or even using a self-projecting inhibitory population ( Segneri et al, 2020 ). Under excitatory oscillatory input at theta frequencies, these models are capable of generating theta-nested gamma oscillations.…”

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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