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Real-Time Excitation of Slow Oscillations during Deep Sleep Using Acoustic Stimulation

M. Piorecky, V. Koudelka, V. Piorecka, J. Strobl, D. Dudysova, J. Koprivova

. 2021 ; 21 (15) : . [pub] 20210730

Language English Country Switzerland

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc21025289

Grant support
NV18-07-00272 Ministerstvo Zdravotnictví Ceské Republiky
SGS21/140/OHK4/2T/17 České Vysoké Učení Technické v Praze
LO1611 NIMH NIH HHS - United States

Slow-wave synchronous acoustic stimulation is a promising research and therapeutic tool. It is essential to clearly understand the principles of the synchronization methods, to know their performances and limitations, and, most importantly, to have a clear picture of the effect of stimulation on slow-wave activity (SWA). This paper covers the mentioned and currently missing parts of knowledge that are essential for the appropriate development of the method itself and future applications. Artificially streamed real sleep EEG data were used to quantitatively compare the two currently used real-time methods: the phase-locking loop (PLL) and the fixed-step stimulus in our own implementation. The fixed-step stimulation method was concluded to be more reliable and practically applicable compared to the PLL method. The sleep experiment with chronic insomnia patients in our sleep laboratory was analyzed in order to precisely characterize the effect of sound stimulation during deep sleep. We found that there is a significant phase synchronization of delta waves, which were shown to be the most sensitive metric of the effect of acoustic stimulation compared to commonly used averaged signal and power analyses. This finding may change the understanding of the effect and function of the SWA stimulation described in the literature.

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