Abstract: The purpose of this experiment is to observe the effect of electrostimulationof dorsal hippocampus after avoidance response on the establishment of spatialavoidance discrimination conditioned reflex. The results are as follows. The stimulation of hippocampus had greater interference in the estalishmentof conditioned reflex during the initial stage The reaction rate(5％) in theexperimental group was significantly lower (p<0.001)than that in the controlgroups. On the other hand, on the second day of training the reactive rateraised to 51％. There were no significant differences between the experimentalgroup and the control group Hence, the influence of stimulating hippoc-ampus on establishing conditioned re?lex was diminished, when the conditionedreflex became established. Our present data suggest that the maintenance ofnormal function of hippocampus in the initial stage of establishing conditionedreflex is important.

Key words: NULL