Abstract: This work used 36 adult female albino rats which were divided randomlyinto three groups. The eleven rats of the first group suffered bilateral entorh-inal area lesions. The eleven rats of the second group were operated as control.The third one which was made up of 14 rats was normal control group. This work was consisted of two experiments which were performed simu-ltaneously. (1)Observing the rats on the aggressive and defensive bebaviorsagainst a training stick, and at last calculating the percentages of strongerreactions of each rat in pre-and postoperative periods.(2)Placing rat in anopen-field, and recording its walked quodrate numbers in 10min. and observingits performance. The results have indicated, after lesions, the percentagesof stronger reactions in two behaviors and the quodrate numbers were all highersignificantly than that before lesions(P<.001;<0.01;<.001).The lesioned ratsshowed few "Jreezing", crouching, grooming, and washing face in both exper-iments. In the first experiment, we also found that the lesioned rats displayeda phenomenon in which they were attracted intensely by a novel visual stim-ulation, i. e., the presentation of the stick. These results were analysed, then we may suggest that one of the chieffunctions of the entorhinal area in the albino rat is probably related to formingemotional factor of fear, and the?efore promoting the immobility in the actionof the rats. In performing these functions, presumably, visual factor may af--fect this process feebly.

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