Obtained data witness to the fact that increased proprioceptive afferentation influenced by rat running in tretbun during 3-6 months beginning from 1 month age arouses statistically true decrease of latencies, as well as excitation reduction cycles of initial responses of visual cortex on light-flash pairings. Increase of functional activity is registrated better on indices of excitation-reduction cycles, than on latencies of initial responses. Functional reorganization of rat visual cortex correlates with density changes of impregnated dendritic spines. It has been morphologically established that already 3 month-motor training results in statistically true density increase of dendritic spines on neurons of layers II+III and layer V complex. This can be interpreted as indication of increase of afferent flow to neurons of superior and inferior layers of visual cortex.