Matt H. answered 05/27/25
A teacher of Systematic Theology and Church History
I think several things should be taken note of here:
(1) Warren's criteria for personhood are at least implicitly influenced by Post-Modern and Enlightenment theories of ethics and the constant emphasis on minds as being equivalent to human personhood per se. Hence, Descartes emphasized that the mind is the "I" of the Cogito!
(2) A better definition of "person" is what is given by medieval philosophy: "an individual substance of a rational nature." Or even more precise, "personhood" in humans is a combination of the human nature (rationality + animality) with subsistence. Subsistence is simply that which is the terminus or "end" of nature, much in the same way that a point terminates a line (this is the way it was explained by the philosopher Peter Auriol).
(3) Much like the excellent answer given above, we can question Warren's argument by showing that the criteria she gives are not necessary for personhood. For example, a person in a coma may not have consciousness the way other humans possess it, but presumably this would not lead us to deny his/her personhood. Similarly, viability would not solve the issue or fill in the "gap".
(4) In terms of personality being required for the pro-life argument, I would note that the problem of the Imago Dei theology is practically unavoidable here. One must first substantiate some objective standard of morals first before delving into particular cases of ethics. Just as you have to know "All men are mortal", and that "Socrates is a man" before one can deduce that Socrates is mortal.