Abstract: In this paper the effects of hippocampus damage on the different stagesof the establishment of dark avoidence conditioned reflex (DAR) and theinfluences of different parts of hippocampus on DAR were reported. The Dataof our experiments were as follows: 1. The extensive damage of thehippocampus results in difficulty to consolidate The DAR, and the more theconditioned reflex is consolidated, the less it is interfered by the extension; 2.The influence of hippocampus on the DAR depends on the region and theextension of damage, and the effect of ventral hippocampus damage on theDAR is more prominent than that of the dorsal one. The results demonstratedthat the hippocampus takes part in the different stages of memory, especiallythe early stage, and the effects of different parts of the hippocampus aredifferent.

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