Changes in EEG fine structure in the occipital areas, heart rate, and breath pattern were recorded in 10 male volunteers under photic stimulation with slowly varying frequency in the range of lower or higher EEG alpha-subbands. Self-ratings (on the scale SAN-self-assessment of state of health, activity, and mood) of the functional state, general activity, and mood were obtained before and after stimulation. EEG effects of such photostimulation were represented by the resonance EEG responses of discrete spectral EEG components, frequencies of which periodically coincided with varying rate of flashes. Resonance alpha-enhancement levels depended on the initial individual EEG alpha-voltage and stimulation frequency. Average changes in objective and subjective parameters did not differ between the conditions of lower and higher frequencies of stimulation but were significantly different and of opposite signs when the subjects gave higher and lower self-ratings of positive stimulation effect regardless of the stimulation frequency.

Adult↗

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[The nonspecific mechanisms of CNS adaptation to intermittent stimuli, EEG spectral structure and the optimal parameters of rhythmic sensory actions].

Presented paper reviews recent literature data about the role of non-specific mechanisms of central nervous system adaptation and intrinsic properties of organism functional systems in the effects of rhythmical sensory influences. Among the reviewed factors which determine particular effectiveness of relatively weak, but rhythmically organized external signals, there are such as an increased sensitivity of living things to different oscillatory actions, the mechanisms of adaptive reactions, resonance central nervous system phenomena and an interaction of rhythmical sensory stimulation with organism endogenous rhythms. Special attention is paid to endogenous rhythms in the electrical activity of the brain, or to the EEG rhythms. Modern state of art in the field of spectral EEG structure analysis is discussed, and some new approaches to rhythmical sensory stimulation efficacy enhancement based on individual high resolution EEG structure features are delineated.

Adaptation, Physiological↗