Here we present the analysis of age-specific and individual characteristics of sensory systems of the right and left hemispheres in preschool children. We studied the role of visual, auditory, and cutaneous sensory zones of the right and left hemispheres in 3.5-5-year-old children in the structure of functional systems realizing attention processes with different efficiency. Sensorimotor parameters reflecting the structure of functional systems at the perceptive level were identified. These data are helpful for diagnostics of the causes of low efficiency of cognition abilities.