Abstract: It was the purpose of this paper to study the role of hippocampusin the formation of conditioned reaction during learning. The hippoca-mpus electro-activity spectrum power array was analyzed with the computer.The results indicate that the hippocampus plays an important role inthe early period of learning. In the later phase, although the appearancerate of conditioned reaction decreased, the hippocampus electro-activitypower increased gradually and significantly. This suggests that hte hippoca-mpus has been active during the whole process of conditioned reaction.

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