Abstract
SummaryThe general activity and emotional responses to various stimuli of the rats with olfactory bulb ablations (O.B. rat) were investigated in comparison with those of the rats with either septal or amygdaloid lesions. The results are summarized as follows:1. The rat gradually became to exert hyperemotional responses to various stimuli, following bilateral removal of the olfactory bulb. This hyperemotionality remained unchanged for a long period of time. The rat with septal lesions, on the contrary, exhibited hyperemotionality immediately after lesioning, but the hyperemotionality disappeared within 2 weeks. Amygdaloid lesions caused no change in the emotional responses to stimuli of intact rats but abolished the hyperemotionality of the O.B. rats.2. In the O.B. rats, muricidal behavior and attack response to a rod were more prominent tiian the other responses, whereas in the septal rat, the hyperemotional responses such as startle, flight, jump and squeak were more marked, and muricidal behavior was scarcely observed.Hyperemotionality of the O.B. rat is regarded as active aggressiveness in nature and that of the septal rat would be better expressed as hyperreactivity or hyperirrit‐ability.3. Exploratory behavior such as ambulation and rearing of the O.B. rat in an open‐field situation markedly increased, while that of the septal rat decreased instead even after the hyperemotionality disappeared. Amygdaloid lesions increased exploratory behavior in intact as well as in the O.B. rats, despite of reducing hyperemotionality of the latter.(This study was supported in part by the grant for the research of science from the Department of Education of the Government of Japan.)
Published Version
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