In a previous study, differential behavioral effects between medial and lateral fimbrial lesions were seen. However, since the lateral fimbrial lesions comprised the stria terminalis and the medial fimbrial lesions did not, it seemed important to know the effects of selective division of the stria in the same behavioral tests. The present results show that section of the stria in rats improved two-way active avoidance performance, whereas the behavior in open field, passive avoidance, and spontaneous alternation tests was not significantly changed. Thus, a reservation must be taken into account with regard to the finding that lateral fimbrial lesions improve two-way active avoidance behavior. The results of stria terminalis sections are discussed in terms of a functional differentiation within the amygdaloid complex.