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In this second of three essays, I describe how the early modern psychologists adopted the strategy of further transforming rats and other species into models of human thought, feeling, and behavior, and, particularly, of disorders of these - in effect taking "a rodent for your thoughts." In the third essay I will provide a critique and empirically-based evaluation of animal model research. Here I indicate what the model strategy in the biomedical sciences, properly understand, is intended to achieve and how, by contrast, particular models are presented to the public and funding agencies. Finally, I describe how they are utilized in psychology.


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