Warren's arguments face two main objections. The comatose patient objection claims that as patients in a reversible coma do not satisfy Warren's (or some other) criteria—they are not conscious, do not communicate, and so on—therefore they would lack a right to life on her view. One response is that "although the reversibly comatose lack any "conscious" mental states, they do retain all their "unconscious" "dispositional" mental states, since the appropriate neurological configurations are preserved in the brain." This may allow them to satisfy some of Warren's criteria. The comatose also still possess brain activity (brain waves), so this objection does not apply to "brain birth" theories. Finally, there are some post-natal humans who are unable to feel pain due to genetic disorders and thus do not satisfy all of Warren's criteria.