Time for a Scientific Update?
When Singapore established its 24-week abortion limit in 1974, bell-bottom jeans were in fashion, and ABBA was topping the charts.
More significantly, medical science understood the fetal brain in a particular way: it was thought that pain could only be perceived after approximately 24 weeks of gestation.
While the main reason for choosing the 24-week cutoff was fetal viability—the point at which a fetus might be able to survive outside the womb—recent scientific discoveries indicate it is perhaps time to take another look at this almost 50-year-old law.
We know now that the fetal brain is more advanced—and complex—than we once thought. If you believe that pain has moral significance regardless of who experiences it, the emerging neuroscience should cause some discomfort with practices we currently have in place.
The Brain Science: Old School vs. New School
The classic view, sometimes called the “cortical necessity” hypothesis, states that an active cerebral cortex—the brain’s outer layer—is required for pain to be experienced. Yet this ongoing theory, which is still endorsed by bodies such as the American College of Obstetricians and Gynecologists (ACOG) and its British counterpart, states that the fetus cannot feel pain until around 24 to 28 weeks into pregnancy.
But naturally, science has advanced, and policy has not kept up. Welcome to the newest “subplate modulation” theory. The new theory suggests that the connections between the thalamus and the cortical subplate—a temporary structure within the developing brain— might be sufficient for a rudimentary but morally significant pain experience. And when do these connections begin to form? Around 12 to 15 weeks’ gestation.
Skeptical? Consider the following: we routinely use direct fetal anesthesia in procedures carried out during the second trimester. Why, you ask? Because fetuses exhibit hormonal, physiological, and behavioral responses to painful stimuli well before 24 weeks. If they were not feeling something akin to pain, those measures would be very puzzling.
As Derbyshire and Bockmann point out—in one of science’s finest “Well, actually” moments—the functional equivalence between subplate-thalamic connection and the ensuing thalamocortical pathways undermines our neat assumptions. If adults with extensive cortical damage can still experience pain (which they can), then on what evidence are we basing our assumption that a fetus with similar subcortical pathways intact could not?
Pain is Pain, No Matter Where It Is
The real question is not “if the fetus experiences pain like one does when one stubs one’s toe.” Instead, it is “if there is any form of pain experience at all”—what the researchers properly call an “immediate and unreflective pain experience.” Think of it as being in pain rather than knowing you’re in pain—a distinction that sounds abstract until you’re in just such a position.
This is the point when we are forced to consider our ethical consistency. We are greatly troubled by the pain experienced by cats, dogs, and laboratory mice, demanding rigorous ethical frameworks and pain management protocols to alleviate it, for example, in research settings or veterinary practices. And yet paradoxically we appear to forget human fetuses, who are just as likely to be able to experience pain.
As philosopher Tom Regan quipped about animal rights: “Pain is pain wherever it occurs. If your neighbor’s causing you pain is wrong because of the pain that is caused, we cannot rationally ignore or dismiss the moral relevance of the pain that your dog feels.” This same logic applies by inference to pain that a fetus might experience.
This bizarre inconsistency in how we apply our knowledge concerning fetal pain has become known as the “fetal pain paradox.” On Monday, a neonatologist might treat a 23-week premature baby as fully capable of pain, administering appropriate pain relief. On Tuesday, an abortion provider might operate under guidelines stating pain perception is “implausible” at the same gestational age. How can it be that merely crossing the Rubicon of the 24-week threshold apparently imparts the ability to feel pain? It’s like a neurological sleight of hand.
The Anesthesia Argument: A Moral Sedative
“Aha!” you might say, “If pain is the issue, we can just administer anesthesia to fetuses when women are having abortions.” Problem solved! But this argument doesn’t hold water.
Look at how we treat animals: we don’t support euthanasia for healthy canines just because we have anesthesia. The fact that an act is not painful does not, in itself, make it ethically uncontroversial. Similarly, if a 12-week fetus is sentient—able to have subjective experiences—then ending its life, even painlessly, raises very critical moral questions.
Sentience is more than just avoiding pain; it confers a broader moral status. As philosopher David DeGrazia argues, sentient beings have interests that matter morally for their own sake. These interests include not just avoiding suffering but also, potentially, continuing to exist.
Jonathan Birch concludes, based on the neuroscientific evidence, that “human fetuses are sentience candidates from the beginning of the second trimester.” If true, anesthesia might reduce suffering during abortion, but it doesn’t make the act itself morally trivial—any more than painlessly ending the life of any other sentient being would be trivial.
Ethical Whiplash and Policy Incoherence
Our current approach gives us a case of ethical whiplash. We acknowledge that the pain felt by cats, dogs, and laboratory mice has moral significance and warrants ethical thoughtfulness. Yet, when presented with human fetuses with very similar neural pathways, we somehow fall prey to an overwhelming bout of moral amnesia.
Singapore’s 24-week threshold now appears as arbitrary as picking a number out of a hat at a carnival. It’s neither aligned with current neuroscience nor ethically consistent with how we treat other vulnerable beings.
Even if you are still on the fence concerning the very point at which pain starts to be felt—and science never provides the neat boundaries policymakers want— the precautionary principle would suggest erring on the side of caution when suffering is at stake. Environmental and clinical decision-making has been guided by this principle for decades: when in doubt about causing potential harm, it is prudent to err on the side of caution and proceed cautiously.
What Now? A Proposal for Singapore
In light of these considerations, Singapore should revisit its 24-week threshold with several guiding principles in mind:
1. Update the science: Incorporate the emerging consensus that thalamic-subplate activity may enable fetal pain perception from as early as 12-15 weeks.
2. Be ethically consistent: If pain evidence in non-human animals is sufficient to mandate humane treatment, apply similar standards to human fetuses.
3. Apply the precautionary principle: In the event of uncertainty, err on the side of preventing potential suffering rather than risking it.
4. Reconsider viability and alternatives: Modern advances in neonatal care have redrawn the limits of viability to earlier points than the 24 weeks defined in 1974. Where delivery outside the uterus is possible, preterm delivery with supporting neonatal treatment and the possibility of adoption need to be considered over against termination.
5. Clarify ethical terminology: It is necessary to distinguish between direct abortion (i.e. intentional termination of fetal life) and medical treatments where fetal death is an unintended but foreseen consequence. When physicians remove a cancerous uterus or induce early labor for preeclampsia to save the mother’s life, the fetal death, while tragic, is not the goal sought – it’s often unavoidable either way. These aren’t “abortions” in the strict ethical sense, and calling them “medically necessary abortions” muddles important moral distinctions.
Hence, a revised threshold that differentiates elective terminations from life-saving maternal treatments would reflect both scientific integrity and moral seriousness.
Moving Forward
Science advances, and the policies that are founded upon it must evolve to accommodate our latest knowledge. As our understanding deepens regarding fetal neurodevelopment, we have a responsibility to ensure our laws reflect our best knowledge and ethical reasoning.
The possibility that the fetus can suffer pain at 12 weeks should give us pause. Just as we would not dismiss evidence of pain in other vulnerable beings, we should not wave away this possibility with a casual hand. At stake is not just medical practice but our moral consistency as a society.
After all, if we’re going to pick arbitrary lines in the arena of human development, we might as well base them on the best science available rather than what was cutting-edge when platform shoes were all the rage.
