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Each behavior is a product of heredity and experience

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In "Phylogeny" Skinner makes two points quite effectively. First, he argues that it is not possible to know either the phylogenetic or the ontogenetic origin of a behavior from knowledge of its apparent purposiveness or adaptiveness, Second, he maintains that ontogenetic contingencies can be well investigated and understood without analyzing the phylogenetic contingencies that may have contributed to the evolution of the behavioral processes. By this he does not mean that species or strain differences should be ignored or that exhaustive knowledge of one mammalian species can substitute for in-depth study of other mammals. Although his earlier writings did imply these erroneous views, this 1966 article does not.

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