I will present empirical data using behavioral and/or neuroimaging studies in human adults and infants. My talk will mainly focuses on topics. First, I will talk about the extent and limits of subliminal perception, in terms of both behavioral and neural influences; Secondly, I will present new approaches to perception without awareness through emotional information induced by crowded videos. Third, I will present some methods for measuring perceptual awareness in infants; Finally, I will focus on the existence of consciousness without attention/access, and discuss the alternative partial awareness hypothesis.