Effects of Audio–Visual Stimulation Automatically Controlled by the Bioelectric Potentials from Human Brain and Heart
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We have compared the effects of open-loop and closed-loop audio–visual stimulation (AVS) generated on-line on the basis of subjects’ bioelectrical activity. In the first experiment, volunteers were presented with closed-loop AVS consisting of photic- and music-like stimuli generated by transformation of the current parameters of subjects’ electroencephalogram (EEG) and heart rhythm. In the second experiment, prearranged composition of photic and musical stimuli was used without feedback from the current bioelectric activity of the subjects. It has been found that the most pronounced shifts in objective and subjective indicators, such as the maximum increase in the EEG α rhythm power relative to the background, positive emotional reactions, and shifts in the functional state of the body, are recorded when AVS is controlled by the current electrophysiological characteristics of the subjects. These effects result from the involvement of interoceptive mechanisms in the system of mechanisms responsible for normalization of human functional state under AVS, i.e., the mechanisms of multisensory integration and neuroplasticity and the resonance mechanisms of the brain.
Keywords:audio–visual stimulation (AVS) closed-loop open-loop feedback electroencephalogram (EEG) heart rhythm interoception correction of stress-induced states
We are grateful to Vitaliy Semenovich Semenov, Chief Expert of the Institute of Cell Biophysics (Russian Academy of Sciences, Pushchino), for his assistance in software development.
This study was supported by the Russian Foundation for Basic Research, project nos. 18-013-01225, 18-413-520 006, and 19-013-00095.
COMPLIANCE WITH ETHICAL STANDARDS
Conflict of interests. The authors declare that they have no conflict of interest.
Statement of compliance with standards of research involving humans as subjects. All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards and with the ethical standards of the Bioethics Committee of the Institute of Cell Biophysics, Russian Academy of Sciences (Pushchino). Informed consent was obtained from all individual participants involved in the study.
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