[The frequency characteristics of the reaction to the intravenous self-administration of narcotics]

Rat experiments have shown that the histograms of intervals between the self-injections of narcotic analgesics (morphine, promedol, buprenorphine) and psychomotor stimulants (cocaine, amphetamine) were essentially different. The quantitative measures of these differences are presented as discrepancy coefficients in the interval distribution between self-injections. The computerized "real time" system for collecting and analyzing the experimental findings of intravenous self-injection was used in rats.