TY  - JOUR
A1  - Rosenblum, Michael
T1  - Controlling collective synchrony in oscillatory ensembles by precisely timed pulses
JF  - Chaos : an interdisciplinary journal of nonlinear science
N2  - We present an efficient technique for control of synchrony in a globally coupled ensemble by pulsatile action. We assume that we can observe the collective oscillation and can stimulate all elements of the ensemble simultaneously. We pay special attention to the minimization of intervention into the system. The key idea is to stimulate only at the most sensitive phase. To find this phase, we implement an adaptive feedback control. Estimating the instantaneous phase of the collective mode on the fly, we achieve efficient suppression using a few pulses per oscillatory cycle. We discuss the possible relevance of the results for neuroscience, namely, for the development of advanced algorithms for deep brain stimulation, a medical technique used to treat Parkinson's disease.
Y1  - 2020
U6  - https://doi.org/10.1063/5.0019823
SN  - 1054-1500
SN  - 1089-7682
VL  - 30
IS  - 9
PB  - American Institute of Physics
CY  - Melville
ER  - 
TY  - JOUR
A1  - Krylov, Dmitrii
A1  - Dylov, Dmitry V.
A1  - Rosenblum, Michael
T1  - Reinforcement learning for suppression of collective activity in oscillatory ensembles
JF  - Chaos : an interdisciplinary journal of nonlinear science
N2  - We present the use of modern machine learning approaches to suppress self-sustained collective oscillations typically signaled by ensembles of degenerative neurons in the brain. The proposed hybrid model relies on two major components: an environment of oscillators and a policy-based reinforcement learning block. We report a model-agnostic synchrony control based on proximal policy optimization and two artificial neural networks in an Actor-Critic configuration. A class of physically meaningful reward functions enabling the suppression of collective oscillatory mode is proposed. The synchrony suppression is demonstrated for two models of neuronal populations-for the ensembles of globally coupled limit-cycle Bonhoeffer-van der Pol oscillators and for the bursting Hindmarsh-Rose neurons using rectangular and charge-balanced stimuli.
Y1  - 2020
U6  - https://doi.org/10.1063/1.5128909
SN  - 1054-1500
SN  - 1089-7682
VL  - 30
IS  - 3
PB  - American Institute of Physics
CY  - Melville
ER  -