Abstract
Seven tree shrews ( Tupaia glis), 10 squirrel monkeys ( Saimiri sciurea), and 12 college students ( Homo sapiens) were tested on a series of extradimensional shifts involving the position and brightness dimensions. While the number of errors each species made per problem differed and conformed to an index of central nervous system development, there were no consistent differences between species in terms of the percentage of total errors per problem. The results were interpreted as indicating the lack of functional differences between those species tested.
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