Over the course of the 18th century, scholarly examinations of animal nature and behavior rejected 'mechanical', overly deterministic hypotheses, suggesting instead that animal action proceeded from a psycho-physiological sentient capacity. Though the ultimate causes of this capacity appeared to elude explanation, they expressed themselves in behaviors that scholars described and analyzed. Interpretations of sentient, animal nature also bore on the contemporary understanding of human nature: like animals, human beings were also considered to possess a psycho-physiological nature that motivated them to act in order to satisfy their vital needs. Adopting this vision of human nature, early German political economists sought to construct a 'human' science, one that emphasized and explored the human interrelationship with the operations of the physical world, yet did not abandon the long-cherished belief in human distinctiveness within nature.
