Abstract
Male hooded rats with aspiration lesions of the olfactory bulb or electrolytic lesions of the anterior olfactory nucleus or of the region ventral to the anterior septum were tested for reactivity to the experimenter and mouse killing. Increased mouse killing in the home cage occurred at the first test session postoperatively in animals with lesions ventral to the anterior septum but not until 14 days postoperatively in animals with lesions in the anterior olfactory nucleus. Mouse killing in a novel environment occurred only in rats with lesions ventral to the anterior septum. Only rats with lesions ventral to the anterior septum showed a reactivity level greater than that of sham lesioned rats. It is suggested that the increase in reactivity which sometimes occurs following aspiration lesions of the olfactory bulb is the result of incidental damage to the region ventral to the anterior septum while the increase in mouse killing is the result of incidental damage to the anterior olfactory nucleus or the region ventral to the anterior septum or both.
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