[Schoolchildren's visual acuity in the dynamics of learning].

The results of the screening study of the acuity of schoolchildren between 7 and 17 years old living in Rostov Region of the Russian Federation are discussed in the article. The method of computer optometry was used to measure acuity. 93772 pupils, 48621 girls and 45151 boys, from 150 schools participated in this examination.

Reflection of the effectiveness of heterosensory integration in measures of event-linked potentials.

The phenomenon of bimodal event-linked potential mismatch and summation of unimodal responses were used to study the relationship between mismatch amplitude and the effectiveness of visual-auditory integration. The effectiveness of integration was assessed in terms of the extent to which experimental measures approached the parameters of the "ideal observer." The greater the effectiveness of integration, the greater the focus of mismatch shifted from the occipital to the frontal areas of the cortex.

[Representation of heterosensory integration effectiveness in parameters of event-related potentials].

A phenomenon of a mismatch of the bimodal ERP and the sum of unimodal ERPs was used in our research. It was investigated how the mismatch amplitude depends on audio-visual integration effectiveness. The effectiveness was calculated on basis of approximation degree of an experimental performance to parameters of "ideal observer".

[Problem of visual segmentation and spatial-frequency filtration].

The analysis of the visual segmentation problem involved questions concerned with a signal description as a result of linear filtering, nature following nonlinear transformations, and possible role of a spatial attention in pooling. Different approaches to the visual segmentation problem are compared. Our data suggest a model of visual segmentation.

[Size as a parameter for tuning visual attention].

The ability of visual attention to tune to the stimulus size (when this size could not be described by spatial frequencies) was studies. Sinusoidal gratings with frequencies of 1.5, 3, and 6 cycle/degree were used as test stimuli.