Abstract

At the center of both Humean and Kantian experience is a connection between the objectivity of perception and the concept of substantial identity. In the course of examining both systems as responses to structurally similar problems of perceptual objectivity, I argue that Kant's conception of substantial persistence is superior to Hume's account of the idea of identity. ;There are deep tensions in Hume's account of perception that are partially explicable in terms of his complex and naturalistic 'moderate scepticism' and the conflict in the faculties of causal reasoning and imagination upon which it rests. Despite the subtlety of his explanatory scepticism, however, there remains a damaging vacillation in Hume between perceptible phenomena understood as the objects of 'vulgar' direct realism on the one hand, and as the subjective images of the causal-representationalist philosophy on the other. There are also difficulties with Hume's idea of perfect identity, the foundation of both the vulgar and philosophical systems of belief in body. Starting from an assumption of radical perceptual diversity, Hume unsuccessfully attempts to build an idea of substantial identity upon the fiction of a duration without change. ;The tension in Hume concerning the direct objects of perception is paralleled by the subjective/objective ambiguity of Kant's perceptual content terms. In Kant, however, the ambiguity reflects a coherent account of conceptualization, perceptual judgment, and self-conscious temporal experience. I examine Kant's arguments for the persistence and absolute permanence of substance and show that they are largely successful if premises are supplied from the general account of objective judgment and the unity of consciousness. ;Hume's theory of perceptual belief is ingenious but ultimately unsatisfactory according to his own criteria. His failure to construct an idea of identity upon a fictitious duration casts favorable light on Kant's contention that substantial identity is a condition on having any cognition of duration. The two philosophers' dispute concerning identity is conceptually connected to their differing treatments of the 'given' element in perception