Evelyn Vargas focuses on the epistemological problems involved in Leibniz's successive definitions of perception in the context of the development of a theory of the actions and the passions of created substances. Although his first characterization of perceptual experience involves "cogitation" or thought that is related to an object as its requisite his newly developed science of dynamics makes it possible to introduce a teleological approach to perception by which sentience can be extended to animals or even living machines more generally. Insofar as perception can be regarded as an organic function it can be treated within the dynamical framework of the exercise of forces. Despite the advantages of this innovating view of perceptual rep...