The new computer technique "Paritet" for studying the function of attention and visual perception was developed by the author in 1995. This technique has been tested in the combined experiment "ECOPSI-95". The study results reveal the differences in the visual perception of symmetric and nonsymmetric images, combined and separate elements of the image. For solution of the problem of developing the methodology of designing the computer tests it is suggested to develop the system of ranging the visual images to suit the complexity of perception.
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