Criteria for personhood
The above points seem to indicate that there may be persons that are not human, and there may be humans that are not persons. For these reasons, many philosophers have tried to give a more precise definition, focusing on some trait or traits that all persons, real and hypothetical, must possess.
The most obvious such trait that persons typically possess is a conscious mind, typically (but not necessarily) with plans, goals, desires, hopes, fears, and so on. Yet the claim that such a mind is necessary for personhood is also problematic, as most would consider human babies as persons, yet their minds do not seem sufficiently advanced to satisfy this condition. A few philosophers have simply accepted that babies are not persons. However, most have not. Instead, some have suggested that the potential for such a mind is the correct trait.
Yet another view is that personhood is not all-or-nothing: there can be degrees of personhood, based on how close to a fully working mind the object in question has. Thus, a typical adult is entirely a person, while a human permanently in a coma is not a person at all. This view also seems to have some unpleasant consequences, for example, that a young child or someone with a moderate mental handicap might be, say, only half a person (and perhaps therefore have only half the rights, or be regarded as half as important).
It is probably true to say that other views also exist, and that the debate is not close to being resolved.
Moral rights and responsibility
Closely related to the debate on the definition of personhood is the relationship between persons, moral rights, and moral responsibility. Many philosophers would agree that all and only persons are expected to be morally responsible, and that persons deserve maximal moral rights. There is less consensus on whether only persons deserve moral rights and whether persons deserve greater moral rights than non-persons. The rights of non-person animals is an example of contention on this issue (see animal rights).
Corporations as persons
Largely separate from the discussion of "real" persons are considerations regarding corporations. Under the Law of the United States, a corporation is considered a person for many legal purposes. Many question the wisdom of this legal fiction; the philosopher John Ralston Saul said, "If you are a person before the law and Exxon or Ford is also a person, it is clear that the concept of democratic legitimacy lying with the individual has been mortally wounded."
See also: natural person, legal person