The Effect of Rhythmic Optical Stimulation on Temporal Parameters of Human Sensorimotor Response and Their Relation to the Spectral Characteristics of the Initial EEG

The effect of optical stimulation at a frequency of 10 Hz (OS_10Hz) on temporal parameters of sensorimotor activity in healthy subjects (n=32) was studied. The expression of the activation response was determined by the ratio of spectral power values (SPα2, μV²) of the high frequency (10-13 Hz) subrange of the α-rhythm of the initial EEG with closed and opened eyes and the frequency of the maximum α-peak (IAPF). A test for simple motor reaction time was performed under normal and OS_10Hz conditions. According to the change in the variability of simple motor reaction time (SD_SMRT) under OS_10Hz compared to the normal conditions, the subjects were classified into two groups: those who showed a decrease (group 1) and those who showed an increase (group 2) in SD_SMRT. The subjects of group 1 had significantly higher IAPF (in the O1 lead with eyes closed) and activation reaction intensity (in the O2, O1, P4, P3, and F3 leads) compared to the subjects of group 2. The obtained data suggest that OS_10Hz changes the parameters of psychomotor reactions of an individual, and the direction of changes is mediated by individual features of the initial EEG.