Turpin B, Johnston T D, Fulk K R
Department of Psychology, University of North Carolina, Greensboro 27412.
Dev Psychobiol. 1988 Jul;21(5):467-76. doi: 10.1002/dev.420210506.
If hamster pups are placed in individual cages at weaning (21 days of age) they begin to hoard food immediately; within 2-6 days, they hoard 90% of the food they take from their food dish in the course of a 1-hr test, consuming only 10% of it. Pups that remain with their littermates after weaning in large group cages do not hoard food until they are placed in individual cages, when hoarding starts immediately. The inhibitory effect of littermates is just as pronounced in hamsters that have been allowed to hoard food in individual cages for 14 days after weaning and are then regrouped into litters. If litters are housed in divided cages that prevent physical interactions among littermates, but allow the interchange of olfactory, auditory, and some visual cues, hoarding is suppressed to an intermediate level. These results show that the presence of siblings inhibits the expression of hoarding, partly as a result of direct physical interactions and partly through the agency of sensory cues. The onset of hoarding following the dispersal of young from the nest cannot be explained as a motivational consequence of the young no longer having access to the mother's food hoard.
如果仓鼠幼崽在断奶时（21日龄）被放置在单独的笼子里，它们会立即开始囤积食物；在2至6天内，在1小时的测试过程中，它们会囤积从食盘中获取的90%的食物，只吃掉其中的10%。断奶后在大群笼子里与同窝幼崽待在一起的幼崽，直到被放入单独的笼子里才会开始囤积食物，此时囤积行为会立即开始。同窝幼崽的抑制作用在断奶后在单独笼子里囤积食物14天、然后再重新组合成窝的仓鼠中同样明显。如果将一窝幼崽安置在分隔的笼子里，以防止同窝幼崽之间的身体互动，但允许嗅觉、听觉和一些视觉线索的交换，囤积行为会被抑制到中等水平。这些结果表明，兄弟姐妹的存在会抑制囤积行为的表现，部分原因是直接的身体互动，部分原因是通过感官线索的作用。幼崽离开巢穴后开始囤积食物，不能解释为幼崽不再能够获取母亲的食物储备所导致的动机结果。
