[Initiation potential of the brain cortex before memory-guided saccades].

Longer latency and duration of memory-guided saccades and their lower amplitude compared with visually-guided saccades testify to the slower programming of the former. Lateral distinctions in the latencies and durations of memory-guided and visually-guided saccades can reflect leading role of the right hemisphere in programming memory-guided saccades and leading role of the left hemisphere in programming visually-guided saccades. Topography and spatiotemporal dynamics of presaccadic potentials P-1 and N-1 within the last 100 ms of latent period suggest that the mechanisms of final stage of the programming of memory-guided and visually-guided saccades are different.

[The characteristics of the reproduction of time intervals and the individual structure of the EEG in man].

The perception of time by humans was studied by the method of time reproduction. The EEG was recorded in Os, Od, Cs, Cd, Fs and Fd derivations. The relative EEG spectral power was determined in the delta-1, delta-2, theta, alpha, beta-1, and beta-2 ranges.

[The dynamics of the dominant alpha-rhythm frequency in the perception and reproduction of time intervals].

Dependence of the dominant alpha frequency on the processes of perception and subsequent reproduction of time intervals by rhythmic hand pressing was analysed. Two groups of subjects were separated, which demonstrated either an increase (I) or a decrease (II) in the dominant alpha frequency after the transition from perception to reproduction. In the I group 83% of the subjects reproduced time intervals with a delay.

[THe characteristics of the autonomic reactions of healthy adolescents and of those with lowered intellectual productivity].

Present research is devoted to psychophysiological study of the mechanisms of functional state control in normal and educationally disabled children using EEG, neuropsychological, and heart rate data obtained during different types of mental activity, including performance of arithmetic, verbal, spatial, and time-perception tests. Attention index and one-minute time interval production in the group of educationally disabled patients were found to be statistically lower than in the normal children. Heart rate level in this group was also lower than in the normal children of the same age.

[The lability of the human background alpha rhythm under functional loads].

Some characteristics of electroencephalographic reaction (alpha frequency, whole alpha range power spectrum and alpha index) have been studied. In the first series the indifferent single, rhythmic and complex stimuli were presented to the test subjects, in another series a conditioned motor reflex was elaborated, in the third series the test subjects rhythmically reproduced fixed temporal interval. It has been shown that the functional loads lead to higher alpha frequency.