[Saccade latency and pattern of saccade response in the experimental scheme "double step"].

To investigate the decision-making process at the saccade programming we used modification of the "double step" experimental scheme, in which two short stimuli are presented successively in the opposite semifields (puls overshoot--scheme). The dependence of saccades to visual stimuli number, responses pattern (two saccades, or a single saccade to the second stimulus) and the value of saccade latency from the first stimulus duration (150 or 50 ms), the spatial stimuli arrangement and the individual characteristics of the subjects was shown. The findings suggest the relationship of attention and decision making processes at saccade programming and indicate to the possible influence of prognostic processes on the saccadic response "pattern" at the expectation period in the experimental "double step" scheme.

[Cortical potentials evoked to response to a signal to make a memory-guided saccade].

The difference in parameters of visually guided and memory-guided saccades was shown. Increase in the memory-guided saccade latency as compared to that of the visually guided saccades may indicate the deceleration of saccadic programming on the basis of information extraction from the memory. The comparison of parameters and topography of evoked components N1 and P1 of the evoked potential on the signal to make a memory- or visually guided saccade suggests that the early stage of the saccade programming associated with the space information processing is performed predominantly with top-down attention mechanism before the memory-guided saccade and bottom-up mechanism before the visually guided saccade.

[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.

[Saccadic latency in human with different profiles of functional asymmetry depending on visual space complicity].

The latencies of visually-guided saccades of 47 right-handed subjects (32 with right leading and 15 with left leading eyes) were studied. Stimulation paradigm was spatially bidimentional, and stimuli were presented along horizontal, vertical and oblique axes. Three levels of visual space complicity and two traditional single-step GAP and OVERLAP temporal paradigms were used.

[Attention and eyes movement. Structure of oculomotor system, phenomenology and saccade programming].

In the review modern conceptions of the brain organization of visiomotor system are given. They based on neurophysiological and clinical researches which show reflection of attention processes at various levels of this system. Phenomenological data of saccadic eyes movements and existing models of saccade programming, which expressed on the basis of studying of saccades latent periods variation in different conditions of visual stimulation, are presented.