[Types of spike activity and nature of neuronal interrelations in the rat neostriatum].

Statistical methods were used to study types of background activity (BA) of neostriatum neurons. Dependence of the crosscorrelation function on the BA type and on a distance between the neurons was examined in acute experiments on rats (one group was immobilized with d-tubocurarin, the other was under nembutal anesthesia). It is shown that BA according to the shape of the autocorrelation and crosscorrelation functions can be classified into five types (I.1, I.2, I.3, II.1, II.2). Pronounced differences in the crosscorrelation function were found between the neurons with grouped BA (I.1, I.2) and the neurons with unitary BA (II.1, II.2). Differences in the crosscorrelation function between close and distant (300-500) microns) neurons were also found.