The introspectionism of Titchener
Unquestionably the most significant introspectionist program in the United States was the "structuralism" of E. B. Titchener. Titchener was concerned to establish the claim that the "new psychology" imported from Germany had made psychology a rigorous empirical science. Lacking a nontrivial account of science, Titchener supported his claim by emphasizing the analogies between psychology as he saw it and an established experimental science—viz. physical chemistry. To understand Titchener's vision of psychology, therefore, we do well to examine his model briefly.
Cummins, R. (1991)., The introspectionism of Titchener, in J. Smith (ed.), Historical foundations of cognitive science, Dordrecht, Springer, pp. 235-242.
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