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In this paper, we present a study on the influence of different social behavior on preschool children's perception of stories narrated either by a humanoid robot or by a human teacher. Four conditions were considered: static human, static robot, expressive human and expressive robot. Two stories, with knowledge and emotional content, were narrated in two different encounters. After each story, children draw what they remember of the story. We examined drawings of 81 children to study whether the sociability of the teacher (robot or human) could influence elements and details recorded. Results suggest a positive effect of the expressive behavior in robot storytelling, whose efficacy is comparable to the human with the same behavior or better if the expressive robot is compared with a static inexpressive human.