ИСТИНА

The statistics of spatial distributions of eye movements during the fixation plays an important role in the processes of visual search. The aim of our study was to investigate the statistical parameters of microsaccades and to verify the conformity of their spatial distributions to the normal Gaussian process. The images with different spatial structure were used as stimuli: drawings consisting of horizontal-vertical lines or graphic fractals. The study was carried out with the help of iView X Hi-Speed 1250 technique. The obtained data were processed to get microsaccade amplitude distributions and distributions of radial densities of start/end microsaccade landing points within the spatial structure of the fixation. The comparison of experimental characteristics with model characteristics obtained for random Gaussian process was done. It was shown that amplitude distributions of microsaccades differed from the normal and could be approximated by power functions, i.e., considered as fractal distributions. The fractal dimensions of eye movement patterns were calculated. It was revealed that the fractal dimension was a strictly individual factor for each observer. This result could allow using this parameter as a marker of visual search individual strategy.