Abstract
Some rats will consistently kill a mouse placed in their cage, others will simply carry the mouse around the cage (without killing), while about 50% of the rats show neither behavior. This experiment investigated the effect of chemical brain stimulation with a cholinergic or anticholinergic drug on mouse killing and mouse carrying by rats. Carbachol significanly inhibited both killing and carrying, while atropine had no effect on the behaviors. These data are inconsistent with previous studies implicating cholinergic mechanisms in the facilitation of mouse killing. The implications of this study are discussed.
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