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Role of the amygdala in the inhibitory control of interspecies aggression in the rat
192 It is concluded that the VMH. in addition to its specific sanely Junction h-~ feeding, plays a broader role in behaviour in that it subserves the processes deciding" which mode of behaviour will receive priority.
Role of the amygdala in the inhibitory control of interspecies aggression in the rat F. ECLANCHER. M. VERGNES, P. SCHMITT AND P. KARLI Laboratoire de Neurophysiologie. Centre de Neurochimie du C.N.R.S., 67000 Strasbourg (France) The amygdala has previously been shown to exert a facilitatory influence upon the release of mouse-killing behaviour in the experienced kilter-rat. Recent data lead to the conclusion that the amygdala also performs an essential roJe in the inhibitory control of the rat's interspecific aggressiveness, both during ontogenesis and in the adult animal. Amygdaloid lesions made at an early age greatly interfere with the inhibition of the killing-behaviour during ontogenesis, (1) When the amygdala is bilaterally lesioned in 8-day-old rat pups, about 90~.~ of the lesioned animals kill mice when adult, as compared with 15 ~o killer-rats in the control group. (2) Early social contacts with mice no longer prevent the development of mouse-killing behaviour in most amygdaloid-lesion ed rats, as 70 ~o of these animals brought up from weaning together with a mouse turn out to be killer-rats. (3) The amygdala also has an essential role in the vicarious behavioural adaptations which normally occur in rats following olfactory bulb removal. In about 75 ~o of the rats kept in a grouped condition after amygdatoid lesions and olfactory bulb removal at the age o f 25 days, postoperative social interactions no longer prevent the development of mouse-killing behavlour. In adult non-killer rats, amygdaloid lesions entail initiation of mouse-killing behaviour 30-120 days following the lesion in about 90 ~ of the animals, provided that their reactivity is increased through food deprivation for 2-3 days before they are presented with a mouse.
Interhemispheric relations and self-stimulation in normal and split-brain monkeys D. A. HOPKINS AND H. G. J. M KUYPERS University, Rotterdam [The Netherlands)
Department of Anatomy, Erasmus
In situations requiring higher cortical functions it is well known that the disconnected hemispheres can perform independently of one another. Whether the same is true for motivation and emotion, which depend to a greater degree on limbic and subcortical structures, has not yet been established. In the present study the relationship between rewarding brain stimulation and lateralisation of motivation.
Role of the amygdala in the inhibitory control of interspecies aggression in the rat F. ECLANCHER. M. VERGNES, P. SCHMITT AND P. KARLI Laboratoire de Neurophysiologie. Centre de Neurochimie du C.N.R.S., 67000 Strasbourg (France) The amygdala has previously been shown to exert a facilitatory influence upon the release of mouse-killing behaviour in the experienced kilter-rat. Recent data lead to the conclusion that the amygdala also performs an essential roJe in the inhibitory control of the rat's interspecific aggressiveness, both during ontogenesis and in the adult animal. Amygdaloid lesions made at an early age greatly interfere with the inhibition of the killing-behaviour during ontogenesis, (1) When the amygdala is bilaterally lesioned in 8-day-old rat pups, about 90~.~ of the lesioned animals kill mice when adult, as compared with 15 ~o killer-rats in the control group. (2) Early social contacts with mice no longer prevent the development of mouse-killing behaviour in most amygdaloid-lesion ed rats, as 70 ~o of these animals brought up from weaning together with a mouse turn out to be killer-rats. (3) The amygdala also has an essential role in the vicarious behavioural adaptations which normally occur in rats following olfactory bulb removal. In about 75 ~o of the rats kept in a grouped condition after amygdatoid lesions and olfactory bulb removal at the age o f 25 days, postoperative social interactions no longer prevent the development of mouse-killing behavlour. In adult non-killer rats, amygdaloid lesions entail initiation of mouse-killing behaviour 30-120 days following the lesion in about 90 ~ of the animals, provided that their reactivity is increased through food deprivation for 2-3 days before they are presented with a mouse.
Interhemispheric relations and self-stimulation in normal and split-brain monkeys D. A. HOPKINS AND H. G. J. M KUYPERS University, Rotterdam [The Netherlands)
Department of Anatomy, Erasmus
In situations requiring higher cortical functions it is well known that the disconnected hemispheres can perform independently of one another. Whether the same is true for motivation and emotion, which depend to a greater degree on limbic and subcortical structures, has not yet been established. In the present study the relationship between rewarding brain stimulation and lateralisation of motivation.