When a subject introspectively reflects on her perceptual experience, she recognizes it as her own only because she has been pre-reflectively aware of it while living through it.
It seems clear that the objects of my visual perception are intersubjectively accessible in the sense that they can in principle be the objects of another’s perception. A subject’s perceptual experience itself, however, is given in a unique way to the subject herself. Although two people, A and B, can perceive a numerically identical object, they each have their own distinct perceptual experience of it; just as they cannot share each other’s pain, they cannot literally share these perceptual exp