University of Wisconsin–Madison Animal testing on non-human primates

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the so-called pit of despair used in experiments conducted on rhesus macaque monkeys during 1970s american comparative psychologist harry harlow @ university of wisconsin–madison. aim of research produce clinical depression. vertical chamber stainless-steel bin slippery sides sloped rounded bottom. 3/8 in. wire mesh floor 1 in. above bottom of chamber allowed waste material drop out of holes. chamber had food box , water-bottle holder, , covered pyramid top monkeys unable escape. harlow placed baby monkeys in chamber alone 6 weeks. within few days, stopped moving , remained huddled in corner. monkeys exhibited marked social impairment , peer hostility when removed chamber; did not recover.








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