Potegal M, Einon D
Department of Developmental Psychobiology, New York State Psychiatric Institute, NY 10032.
Dev Psychobiol. 1989 Mar;22(2):159-72. doi: 10.1002/dev.420220206.
Matched litter mates were reared in one of three conditions: in pairs or in isolation with or without one hour of daily playfighting experience from 20 to 50 days of age. The rats were then regrouped within condition so that they lived with identically reared cagemates for a month. This regrouping eliminated the transient effects of isolation such as increased fearfulness. When tested as adults, there was no effect of early rearing condition on the probability of intraspecific aggression or muricide, although isolation-reared rats were less likely to retrieve the mice. However, isolation rearing reduced the latency to initiate shock-induced defensive aggression and increased both its frequency and intensity. Isolated animals which had been given daily playfighting during development did not show the effects of early social deprivation. The mechanisms through which playfighting experience shapes later defensive behavior remain to be determined.
成对饲养，或在20至50日龄时单独饲养，有无每天1小时的打斗玩耍经历。然后在每种条件下将大鼠重新分组，使它们与饲养条件相同的同笼伙伴一起生活一个月。这种重新分组消除了隔离的短暂影响，如恐惧增加。成年后进行测试时，早期饲养条件对种内攻击或杀鼠概率没有影响，尽管单独饲养的大鼠找回小鼠的可能性较小。然而，单独饲养会缩短引发电击诱导防御性攻击的潜伏期，并增加其频率和强度。在发育过程中每天有打斗玩耍经历的单独饲养动物没有表现出早期社会剥夺的影响。打斗玩耍经历塑造后期防御行为的机制仍有待确定。
