情動反応性の異なるラットの社会的認知行動の特徴 : ストレンジャーラットに対する反応行動による解析
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概要
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The present study examined the characteristics of the social cognitive behaviors, that is, variousactive or passive behaviors towards stranger rat (Long-Evans strain rat: L-E), in Tsukuba high(H)and low(L) emotional strain rat. As forms of active behavior, the approaching, sniffi ng, followupbehavior and attack behavior towards L-E rats were observed for ten minutes in an adaptedsquare open-fi eld device (80×80×30cm), in which an H or L rat was placed on a diagonal linewith respect to an L-E rat. Observations were divided between the fi rst fi ve minute and the secondfi ve minutes. Escape and defense behaviors as forms of passive behavior were also observed inthe same way. As a result, H rats showed a variety of defense behaviors, as expected. However, agreater number of approaching and attack behaviors was recognized in H rats than in L rats. Thistendency was particularly remarkable in H female rats. In contrast, L rats demonstrated manyfollow-up behaviors, but exhibited only little attack behavior. Therefore, it was suggested that thesocial cognitive behaviors of the Tsukuba emotional strain rat in a nonresident one to one situationwere different from those seen in a resident or group colony.
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