 That is, S is prima facie justified whether or not perception is reliable for S and whether or not S has any evidence in favor of the claim that perception is reliable. Perceptual beliefs are justified by the experience alone, in virtue of some intrinsic feature of that experience (its content, or phenomenal character, or assertive force, etc.). Of course, because the justification here is only prima facie justification, this justification could be defeated if, say, S has good enough reason to think that perception is unreliable, or has independent evidence that p is false.