The goal of this work was to describe the principle of operation and construction of KID apparatus for objective quantitative assessment of the state of brain structures responsible for programming, initiation, implementation, and sensory control of human motor activity. The apparatus provides automatic assessment of parameters of visual and motor coordination, adaptability, motion accuracy, and reactivity in subjects performing simple motor tests. The testing procedure based on multidimensional analysis of motor activity is theoretically substantiated. Multidimensional analysis makes it possible to separate contributions of various psychophysiological processes to motor activity. The psychomotor tests constituting the testing procedure are described in their sequence order.