The effects of environmental restriction upon the chimpanzee's responsiveness to objects

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In sharp contrast to 2-yr.-old wild-born chimpanzees, similarly aged Ss raised in restricted environments were timid of objects, contacted them rarely, and spent most of their time in stereotyped self-directed activities. Restricted Ss raised in pairs were the most timid of all and dependent upon each other for adaptation to stimuli. A restricted group that had had special manipulatory experience surpassed other isolates in object-contact, but only in situations similar to rearing. A restricted group with special visual experience did not differ from maximally restricted Ss who had been reared for 21 mo. in bare gray cubicles. It was argued that restricted chimpanzees are retarded but potentially typical in their responsiveness to objects. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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