This chapter considers three distinct but related classes of evidence: behavioral studies, neuroimaging, and brain-damaged patient case studies. It discusses recent advances in the study of implicit perception, considering the ways in which they do and do not improve on earlier approaches. The chapter highlights claims for implicit perceptual or semantic processing of discrete stimuli, largely overlooking implicit skill learning, artificial grammar learning, or other forms of procedural knowledge that might well be acquired without awareness. It also considers recent arguments about how best to study implicit perception. Claims for and against implicit perception received extensive empirical attention starting in the late 1950s, with sentiment in the field vacillating between acceptance and skepticism. Finally, the chapter discusses how qualitative differences in the nature of perceptual processing may be of theoretical significance even without a clear demonstration that processing occurs entirely outside of awareness.