Abstract
Differential effects of isolated housing (social deprivation), aggregated housing as well as olfactory bulbectomy were inverstigated from the standpoint of behavioral observation in rats and mice. A marked decrease was observed both in preening and grooming of general behaviors in rats by the treament of isolated housing for 4 weeks, but not in ambulation and reaing behaviors. Rats with olfactory bulbectomy (O. B. rats) which have increased locomotor activity, showed more higher elevation of ambulation and completely abolished preening or grooming behaviors when they were subjected to isolated housing. With the rats treated in this manner, the beginning of a higher increase in emotional response to stimuli was 2 weeks after the treatment of isolated housing, furthermore, such an increase was facilitated evidently by the additional treatment of olfactory removal. The active or passive conditioned avoidance responce of rats was inhibited by the treatment of isolated housing. From these results; distortions of emotionality such as disappearance of emotional stability, inhibition of conditioning behavior and hyperreactivity were observed by longterm isolation; furthermore, they were exaggerated by olfactory bulbectomy.
