[Analysis of the forms of cross correlation functions of cortical neuron spike activity].

The study concerns the distribution of significant extremums on the graphs of crosscorrelation functions of unit activity in the visual and sensorimotor cortical areas of alert, non-immobilized and unanaesthetized rabbits. It is assumed that the major factor determining a relatively high level of concordance between the discharges of the neurones in the same cortical microvolume is the parallel influence they receive from a common source. At the same time, for units which are far apart, such influence may be only one of the conditions determining the degree of efficiency of their functional interaction.