Skip to main content

Brain Life and the Argument from Potential: Affirming the Ontological Status of Human Embryos and Fetuses

  • Chapter
  • First Online:
Persons, Moral Worth, and Embryos

Part of the book series: Philosophy and Medicine ((CSBE,volume 111))

Abstract

The moral status of human embryos and fetuses is one of the most vexed questions in bioethics and various responses often stand or fall on the answer to the question of the ontological status of such entities: whether they count as “persons,” “potential persons,” or merely “human biological material.” The “argument from potential” is intended to support the claim that embryos and fetuses, while not yet persons, are more than mere biological material insofar as there is a high degree of probability that they will develop into persons. A stronger foundation for contending that embryos and fetuses bear the same basic right to life as persons is to establish that such entities are not potential, but actual persons due to their intrinsic potentiality to develop themselves into beings who can engage in those activities definitive of personhood. In addition to critiquing the argument from potential, those who deny that embryos and early-term fetuses count as persons charge that those who understand “whole-brain death” to be necessary and sufficient for a human person to go out of existence inconsistently deny a symmetrical criterion of “brain life” to mark the beginning of a person’s existence. We respond to this charge of inconsistency while further arguing that embryos and fetuses possess the ontological and moral status of persons due to their intrinsic potentiality to develop a brain supportive of self-conscious rational thought.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 84.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 109.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info
Hardcover Book
USD 109.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  • Ad Hoc Committee of the Harvard Medical School. 1968. A definition of irreversible coma. Journal of the American Medical Association 205: 337–340.

    Article  Google Scholar 

  • Aquinas, Thomas. 1948. Summa theologiae (trans: English Dominican Fathers). New York, NY: Benziger.

    Google Scholar 

  • Aquinas, Thomas. 1984. Quaestio disputata de anima (trans: Robb, J.). Milwaukee, WI: Marquette University Press.

    Google Scholar 

  • Aquinas, Thomas. 1995. Sententia libri metaphysicorum (trans: Rowan, J.). Notre Dame: Dumb Ox Books.

    Google Scholar 

  • Ashley, Benedict. 1976. A critique of the theory of delayed hominization. In An ethical evaluation of fetal experimentation: An interdisciplinary study, eds. D. McCarthy and A. Moraczewski, 115–129. St Louis, MO: Pope John XXIII Center.

    Google Scholar 

  • Ashley, Benedict, and Albert Moraczewski. 2001. Cloning, Aquinas, and the embryonic person. National Catholic Bioethics Quarterly 1: 189–201.

    Google Scholar 

  • Baker, Lynne Rudder. 2005. When does a person begin? Social Philosophy and Policy 22: 25–48.

    Google Scholar 

  • Beddington, R., and E. Robertson. 1999. Axis development and early asymmetry in mammals. Cell 96: 195–209.

    Article  Google Scholar 

  • Bigelow, John, and Robert Pargetter. 1988. Morality, potential persons and abortion. American Philosophical Quarterly 25: 173–181.

    Google Scholar 

  • Boethius. 1918. Contra Eutychen et Nestorium. In Tractates and the consolation of philosophy, trans. H.F. Stewart, E.K. Rand, and S.J. Tester, 72–129. Cambridge, MA: Harvard University Press.

    Google Scholar 

  • Brown, Brandon P. 2008. Ergon and the embryo. MA thesis, Indiana University-Purdue University Indianapolis.

    Google Scholar 

  • Brown, Brandon P., and Jason T. Eberl. 2007. Ethical considerations in defense of embryo adoption. In The ethics of embryo adoption and the Catholic tradition, eds. Sarah-Vaughan Brakman and Darlene Fozard Weaver, 103–118. Dordrecht: Springer.

    Google Scholar 

  • Brown, Mark T. 2007. The potential of the human embryo. Journal of Medicine and Philosophy 32: 585–618.

    Article  Google Scholar 

  • Buckle, Stephen. 1988. Arguing from potential. Bioethics 2: 227–253.

    Article  Google Scholar 

  • Burke, Michael B. 1996. Sortal essentialism and the potentiality principle. Review of Metaphysics 49: 491–514.

    Google Scholar 

  • Charo, R. Alta. 2001. Every cell is sacred: Logical consequences of the argument from potential in the age of cloning. In Cloning and the future of human embryo research, ed. Paul Lauritzen, 82–89. New York, NY: Oxford University Press.

    Google Scholar 

  • Covey, Edward. 1991. Physical possibility and potentiality in ethics. American Philosophical Quarterly 28: 237–244.

    Google Scholar 

  • Davis, Dena. 2010. Genetic dilemmas, 2nd ed. New York, NY: Oxford University Press.

    Google Scholar 

  • DeGrazia, David. 2008. Must we have full moral status throughout our existence? A reply to Alfonso Gómez-Lobo. Kennedy Institute of Ethics Journal 17: 297–310.

    Article  Google Scholar 

  • DiSilvestro, Russell. 2006. Not every cell is sacred: A reply to Charo. Bioethics 20: 146–157.

    Article  Google Scholar 

  • Eberl, Jason T. 2004. Aquinas on the nature of human beings. Review of Metaphysics 58: 333–365.

    Google Scholar 

  • Eberl, Jason T. 2005a. Aquinas’s account of human embryogenesis and recent interpretations. Journal of Medicine and Philosophy 30: 379–394.

    Article  Google Scholar 

  • Eberl, Jason T. 2005b. A Thomistic understanding of human death. Bioethics 19: 29–48.

    Article  Google Scholar 

  • Eberl, Jason T. 2006. Thomistic principles and bioethics. New York, NY: Routledge.

    Google Scholar 

  • Eberl, Jason T. 2008. Potentiality, possibility, and the irreversibility of death. Review of Metaphysics 62: 61–77.

    Google Scholar 

  • Eberl, Jason T. 2009. Thomism and the beginning of personhood. In Defining the beginning and end of life: Readings on personal identity and bioethics, ed. John P. Lizza, 317–338. Baltimore, MD: Johns Hopkins University Press.

    Google Scholar 

  • Eberl, Jason T. 2011. Ontological status of whole-brain dead individuals. In The ethics of organ transplantation, ed. Steven Jensen, 43–71. Washington, DC: Catholic University of America Press.

    Google Scholar 

  • Feinberg, Joel. 1986. Abortion. In Matters of life and death: New introductory essays in moral philosophy, ed. Tom Regan, 2nd ed, 256–293. New York, NY: Random House.

    Google Scholar 

  • Finnis, John. 2006. Abortion and health care ethics. In Bioethics: An anthology, eds. Helga Kuhse and Peter Singer, 2nd ed, 17–24. Oxford: Blackwell.

    Google Scholar 

  • Ford, Norman M. 1988. When did I begin? Conception of the human individual in history, philosophy and science. New York, NY: Cambridge University Press.

    Book  Google Scholar 

  • Gardner, R.L. 1997. The early blastocyst is bilaterally symmetrical and its axis of symmetry is aligned with the animal-vegetal axis of the zygote in the mouse. Development 124: 289–301.

    Google Scholar 

  • Gardner, R.L. 2001. Specification of embryonic axes begins before cleavage in normal mouse development. Development 128: 839–847.

    Google Scholar 

  • Gardner, R.L. 2002. Thoughts and observations on patterning in early mammalian development. Reproductive Biomedicine Online 4: 46–51.

    Google Scholar 

  • George, Robert P., and Christopher Tollefsen. 2008. Embryo: A defense of human life. New York, NY: Doubleday.

    Google Scholar 

  • Gertler, Gary B. 1986. Brain birth: A proposal for defining when a fetus is entitled to human life. Southern California Law Review 59: 1061–1078.

    Google Scholar 

  • Gogtay, N., J.N. Giedd, et al. 2004. Dynamic mapping of human cortical development during childhood through early adulthood. Proceedings of the National Academy of Sciences 101: 8174–8179.

    Article  Google Scholar 

  • Goldenring, John M. 1985. The brain-life theory: Towards a consistent biological definition of humanness. Journal of Medical Ethics 11: 198–204.

    Article  Google Scholar 

  • Gómez-Lobo, Alfonso. 2004. Does respect for embryos entail respect for gametes? Theoretical Medicine and Bioethics 25: 199–208.

    Article  Google Scholar 

  • Gómez-Lobo, Alfonso. 2005. On potentiality and respect for embryos: A reply to Mary Mahowald. Theoretical Medicine and Bioethics 26: 105–110.

    Article  Google Scholar 

  • Gómez-Lobo, Alfonso. 2009. The morality of embryo use by Louis M. Guenin. Notre Dame Philosophical Reviews. http://ndpr.nd.edu/review.cfm?id=15485/. Accessed 1 May 2010.

  • Guenin, Louis M. 2008. The morality of embryo use. New York, NY: Cambridge University Press.

    Google Scholar 

  • Hanson, Stephen S. 2006. More on respect for embryos and potentiality: Does respect for embryos entail respect for in vitro embryos? Theoretical Medicine and Bioethics 27: 215–226.

    Article  Google Scholar 

  • Hershenov, David B. 1999. The problem of potentiality. Public Affairs Quarterly 13: 255–271.

    Google Scholar 

  • Hudson, Hud. 2001. A materialist metaphysics of the human person. Ithaca, NY: Cornell University Press.

    Google Scholar 

  • John Paul II. 2001. Address to the international congress on transplants. National Catholic Bioethics Quarterly 1: 89–92.

    Google Scholar 

  • Jones, D. Gareth. 1989. Brain birth and personal identity. Journal of Medical Ethics 15: 173–178.

    Article  Google Scholar 

  • Jones, D. Gareth. 1998. The problematic symmetry between brain birth and brain death. Journal of Medical Ethics 24: 237–242.

    Article  Google Scholar 

  • Joyce, Robert E. 1978. Personhood and the conception event. The New Scholasticism 52: 97–109.

    Google Scholar 

  • Kretzmann, Norman. 1999. The metaphysics of creation: Aquinas’s natural theology in Summa contra gentiles II. Oxford: Clarendon Press.

    Google Scholar 

  • Larmer, Robert. 1995. Abortion, personhood and the potential for consciousness. Journal of Applied Philosophy 12: 241–251.

    Article  Google Scholar 

  • Lee, Patrick. 1996. Abortion and unborn human life. Washington, DC: Catholic University of America Press.

    Google Scholar 

  • Lee, Patrick. 2004. The pro-life argument from substantial identity: A defence. Bioethics 18: 249–263.

    Article  Google Scholar 

  • Lee, Patrick, and Robert P. George. 2008. Body-self dualism in contemporary ethics and politics. New York, NY: Cambridge University Press.

    Google Scholar 

  • Liao, S. Matthew. 2007. Time-relative interests and abortion. Journal of Medicine and Philosophy 4: 242–256.

    Google Scholar 

  • Lizza, John P. 2007. Potentiality and human embryos. Bioethics 21: 379–385.

    Article  Google Scholar 

  • Locke, John. 1975. An essay concerning human understanding, ed. P.H. Nidditch. New York, NY: Oxford University Press.

    Google Scholar 

  • Lockwood, Michael. 1988. Warnock versus Powell (and Harradine): When does potentiality count? Bioethics 2: 187–213.

    Article  Google Scholar 

  • Mahowald, Mary B. 2004. Respect for embryos and the potentiality argument. Theoretical Medicine and Bioethics 25: 209–214.

    Article  Google Scholar 

  • Marquis, Don. 1989. Why abortion is immoral. Journal of Philosophy 86: 183–202.

    Article  Google Scholar 

  • McHugh, Paul R. 2004. Zygote and ‘clonote’: The ethical use of embryonic stem cells. New England Journal of Medicine 351: 209–211.

    Article  Google Scholar 

  • McMahan, Jeff. 2002. The ethics of killing: Problems at the margins of life. New York, NY: Oxford University Press.

    Book  Google Scholar 

  • Moody, H.R. 2009. Aging: Concepts and controversies, 5th ed. Thousand Oaks, CA: Pine Forge Press.

    Google Scholar 

  • Moussa, Mario, and Thomas A. Shannon. 1992. The search for the new pineal gland: Brain life and personhood. Hastings Center Report 22: 30–37.

    Google Scholar 

  • Oderberg, David S. 1997. Modal properties, moral status, and identity. Philosophy and Public Affairs 26: 259–276.

    Article  Google Scholar 

  • Olson, Eric. 1997. The human animal: Personal identity without psychology. New York, NY: Oxford University Press.

    Google Scholar 

  • Pasnau, Robert. 2002. Thomas Aquinas on human nature. New York, NY: Cambridge University Press.

    Google Scholar 

  • Perrett, Roy W. 2000. Taking life and the argument from potentiality. Midwest Studies in Philosophy 24: 186–197.

    Article  Google Scholar 

  • Persson, Ingmar. 2002. Human death: A view from the beginning of life. Bioethics 16: 20–32.

    Article  Google Scholar 

  • Piotrowska, K., and M. Zernicka-Goetz. 2001. Role for sperm in spatial patterning of the early mouse embryo. Nature 409: 517–521.

    Article  Google Scholar 

  • Piotrowska, K., F. Wianny, R.A. Pedersen, and M. Zernicka-Goetz. 2001. Blastomeres arising from the first cleavage division have distinguishable fates in normal mouse development. Development 128: 3739–3748.

    Google Scholar 

  • Plantinga, Alvin. 1993. Warrant and proper function. New York, NY: Oxford University Press.

    Book  Google Scholar 

  • Potts, Michael. 2000. Pro-life support of the whole brain death criteria: A problem of consistency. In Beyond brain death, eds. Michael Potts, Paul A. Bryne, and Richard G. Nilges, 121–138. Boston, MA: Kluwer.

    Google Scholar 

  • President’s Commission for the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research. 1981. Defining death: Medical, legal, and ethical issues in the definition of death. Washington, DC: U.S. Government Printing Office.

    Google Scholar 

  • President’s Council on Bioethics. 2002. Human cloning and human dignity: An ethical inquiry. http://bioethics.georgetown.edu/pcbe/reports/cloningreport/. Accessed 1 May 2010.

  • Reichlin, Massimo. 1997. The argument from potential: A reappraisal. Bioethics 11: 1–23.

    Article  Google Scholar 

  • Repertinger, Susan, William P. Fitzgibbons, Matthew F. Omojola, and Roger A. Brumback. 2006. Long survival following bacterial meningitis-associated brain destruction. Journal of Child Neurology 21: 591–595.

    Article  Google Scholar 

  • Rogers, Katherin A. 1992. Personhood, potentiality, and the temporarily comatose patient. Public Affairs Quarterly 6: 245–254.

    Google Scholar 

  • Sass, Hans-Martin. 1989. Brain life and brain death: A proposal for normative agreement. Journal of Medicine and Philosophy 14: 45–59.

    Google Scholar 

  • Savulescu, Julian. 2001. Should we clone human beings? Cloning as a source of tissue transplantation. In Cloning: Responsible science or technomadness?, eds. M. Ruse and A. Sheppard, 212–230. Amherst, NY: Prometheus Books.

    Google Scholar 

  • Schwarz, Stephen. 1998. Personhood begins at conception. In The abortion controversy 25 years after Roe v. Wade: A Reader, eds. Louis P. Pojman and Francis J. Beckwith, 257–273. Belmont, CA: Wadsworth.

    Google Scholar 

  • Shewmon, D. Alan. 1997. Recovery from brain death: A neurologist’s Apologia. Linacre Quarterly 64: 30–96.

    Google Scholar 

  • Shewmon, D. Alan. 1998. ‘Brainstem death,’ ‘brain death’ and death: A critical re-evaluation of the purported equivalence. Issues in Law and Medicine 14: 125–145.

    Google Scholar 

  • Shewmon, D. Alan. 2001. The brain and somatic integration: Insights into the standard biological rationale for equating ‘brain death’ with death. Journal of Medicine and Philosophy 26: 457–478.

    Article  Google Scholar 

  • Singer, Peter. 1975. Animal liberation. New York, NY: Random House.

    Google Scholar 

  • Singer, Peter. 1992. Embryo experimentation and the moral status of the embryo. In Philosophy and health care, eds. Eric Matthews and Michael Menlowe, 81–91. Brookfield: Avebury.

    Google Scholar 

  • Singer, Peter, and Karen Dawson. 1990. IVF technology and the argument from potential. In Embryo experimentation: Ethical, legal and social issues, eds. Peter Singer, Helga Kuhse, Stephen Buckle, Karen Dawson, and Pascal Kasimba, 76–89. New York, NY: Cambridge University Press.

    Google Scholar 

  • Stone, Jim. 1987. Why potentiality matters. Canadian Journal of Philosophy 17: 815–830.

    Google Scholar 

  • Stump, Eleonore. 2003. Aquinas. New York, NY: Routledge.

    Google Scholar 

  • Tooley, Michael. 1983. Abortion and infanticide. New York, NY: Oxford University Press.

    Google Scholar 

  • van Inwagen, Peter. 1990. Material beings. Ithaca, NY: Cornell University Press.

    Google Scholar 

  • Wade, Francis C. 1975. Potentiality in the abortion discussion. Review of Metaphysics 29: 239–255.

    Google Scholar 

  • Warren, Mary Anne. 1994. On the moral and legal status of abortion. In Contemporary issues in bioethics, eds. Tom L. Beauchamp and LeRoy Walters, 4th ed, 302–311. Belmont, CA: Wadsworth.

    Google Scholar 

  • Warren, Mary Anne. 1997. Moral status: Obligations to persons and other living things. New York, NY: Oxford University Press.

    Google Scholar 

  • White, R., H. Angstwurm, and I. Carrasco de Paula. 1992. Working group on the determination of brain death and its relationship to human death. Vatican City: Pontificia Academia Scientiarum.

    Google Scholar 

  • Witt, Charlotte. 1995. Powers and possibilities: Aristotle vs. the Megarians. Proceedings of the Boston Area Colloquium in Ancient Philosophy 11: 249–266.

    Google Scholar 

Download references

Acknowledgements

We wish to thank Michael Burke, Russell DiSilvestro, David Hershenov, Al Howsepian, Christopher Kaczor, Christopher Tollefsen, and an anonymous reviewer for helpful comments on an earlier draft of this paper. A version of this paper was delivered at the 20th University Faculty for Life Conference at the Catholic University of America in Washington, D.C., June 2010.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Jason T. Eberl .

Editor information

Editors and Affiliations

Rights and permissions

Reprints and permissions

Copyright information

© 2011 Springer Science+Business Media B.V.

About this chapter

Cite this chapter

Eberl, J.T., Brown, B.P. (2011). Brain Life and the Argument from Potential: Affirming the Ontological Status of Human Embryos and Fetuses. In: Napier, S. (eds) Persons, Moral Worth, and Embryos. Philosophy and Medicine(), vol 111. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1602-5_3

Download citation

Publish with us

Policies and ethics