Semax effects on formation of active avoidance reaction in rats in different experimental models have been studied. It was shown that intraperitoneal Semax administration at a dose of 0.05 mg/kg accelerated acquisition of one-way active avoidance response when rats were trained to avoid electric foot-shock by jumping on the shelf. When rats were trained in shuttle-box the peptide increased the electroshock threshold value required to provocation of rat moving in experimental box and delayed acquisition of two-way active avoidance response. At the same time Semax stimulated avoidance response restoration in shuttle-box after functional disturbances induced by acute modification of cause-effect and spatial relationships in experimental environment. Data obtained support nootropic properties of Semax.
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