ЭЭГ-характеристики восприятия иллюзорного движения
Dynamics of EEG indicators of women in preovulation (the I stage) and pastovulation periods (theII stage)OMC is researched. Higher values of sizes of amplitude and average power rhythms EEG in Ist phase OMC in comparison with IInd stage are established, recorded, in right hemisphere
This research was focused on postdictive properties of apparent motion — an illusion of movement resulting from successive presentation of two dots. Obviously, the mechanisms of integration of two dots’ representations can take place only after the second dot is presented. There are two alternatives of what exactly happens. Firstly, a person becomes aware of the first dot, then the second dot, and then reconstructs his or her memories of what he or she just saw. Secondly, the person becomes aware of the first dot, and unconscious integration occurs before he/she becomes aware of the second dot, so that the person becomes aware of the sum “sense of motion + second dot”. Our research revealed evidence in favor of the latter— unconscious integration. During the experiment, participants observed stimuli corresponding to different levels of illusory strength or lack of illusion. Significant differences in amplitudes of ERP components P100 and N200 can be related to qualitative differences in awareness of the second dot, depending on the strength of illusion. This means that these differences are determined by unconscious integration that happened prior to awareness. Significant differences of alpha-band power up to 300 ms after the second dot’s onset demonstrate that unconscious integration can be performed at the expense of suppression of the alpha-band. Thus, the contents of perception which a person apprehends can be described as unconscious integration of stimuli, captured in a small time interval prior to the moment of awareness. Going forward, we can seek to determine more
The dynamics of EEG indicators in the estrogen (EF) (1-14 day) and progesterone phase (PF) (15-28 day) of the ovarian-menstrual cycle (OMC) in 49 healthy women was studied. A 21-channel electroencephalic graph "Neuron-Spectrum-4/VP"was used. The greatest changes during OMC are registered for "fast" EEG rhythms. In EF using correlation analysis revealed a linear decrease in the values of power and amplitude parameters of beta-rhythm of EEG from 1 to 14 days OMC mainly in the right hemisphere. In PF, there was a linear increase in the dominant frequency of the alpha rhythm of the EEG in the anterior part of the scalp from 15 to 28 days of the cycle, which is also characteristic of the full amplitude and the index of the main rhythm of the EEG. When comparing the averaged values in the two phases of the cycle, large values of the average power of alpha and beta rhythms are set in PF compared to EEG EEG. Thus, the values of bioelectric characteristics of the brain of women decrease during the EF due to beta rhythm and rise in the PF phase of the cycle due to alpha rhythm. It is discussed the connection of this dynamics with EEG psycho-physiological characteristics of females on the generations of the UMC.