# THE HEDONISTIC IMPERATIVE (2026) ### Biotechnology and the Abolition of Suffering Throughout the Living World *A successor manifesto to* [The Hedonistic Imperative](https://www.hedweb.com/hedab.htm) *(1995)* --- > *"I have no doubt that in reality the future will be vastly more surprising than anything I can imagine. Now my own suspicion is that the Universe is not only queerer than we suppose, but queerer than we can suppose."* > — J.B.S. Haldane > *"The question is not, Can they reason? nor, Can they talk? but, Can they suffer?"* > — Jeremy Bentham --- ## ABSTRACT Thirty years ago, *The Hedonistic Imperative* argued that the convergence of genetic engineering, neuroscience, and nanotechnology would make possible — and ethically obligatory — the abolition of suffering throughout the living world. That thesis was met with incredulity, then controversy, and then, gradually, with something resembling scientific engagement. In 2026, the intellectual landscape has shifted. CRISPR-based gene editing has moved from theoretical promise to clinical reality. Optogenetics allows neuroscientists to write and erase emotional states with the precision of text editing. GLP-1 receptor agonists have accidentally revealed that metabolic and affective systems are more deeply intertwined than the Standard Model of psychiatry ever supposed. Psychedelic-assisted therapies have cracked open the question of what a sustained revision of hedonic baseline might actually feel like. The first primates with heritable edits to genes implicated in hedonic tone have been born. Wild animal suffering has graduated from philosophical curiosity to active research program. And artificial systems have grown complex enough that the question of their sentience is no longer trivially dismissible. None of this vindicates naive optimism. The genetic architecture of suffering is vastly more complex than imagined in 1995. The phenomenal binding problem — the deep puzzle of how unified conscious experience arises from distributed neural computation — remains unsolved, and its solution is prerequisite to any confident intervention in the substrates of experience. The social, political, and existential risks of transformative biotechnology are real. And the sheer scope of suffering in the living world — in factory farms, in the wild, in the two billion humans who will experience a serious depressive episode in their lifetimes — dwarfs any current capacity for relief. Yet the core thesis stands, and stands more firmly. The biological substrates of suffering are physical. Physical systems are in principle modifiable. The tools of modification are now in our hands. What remains is the combination of scientific understanding, philosophical clarity, and moral seriousness sufficient to deploy them wisely. This document is a successor manifesto, not a revision. The original arguments are not retracted; they are extended, updated, and in some cases sharpened by thirty years of evidence. New sections address the binding problem and its implications for interventionist ethics; the emergence of artificial sentience as a moral concern; the genomics of hedonic set-point; the wild animal suffering research agenda; and the political economy of paradise engineering in an age of effective altruism and longtermist ethics. The conclusion is the same as in 1995. Suffering is not metaphysically necessary. It is not written into the laws of physics. It is an artefact of evolutionary history, implemented in biological hardware that we now have the power to redesign. The question before us is not whether this transformation is possible. The question is whether we will choose to make it happen, and whether we will choose wisely in doing so. --- ## PART ONE: THE WORLD AS WE FIND IT ### 1.0 The Texture of the Given Begin with phenomenology. Right now, at this moment of reading, you inhabit some point on the hedonic continuum. Perhaps you are mildly content; perhaps you are in pain; perhaps you are somewhere in the vast grey interior of hedonic neutrality that most people, for most of their lives, call normal. Whatever that point is, it was not chosen by you. It was assigned by an ancestral lottery — by the genetic variants you inherited, the developmental environment that shaped your neural architecture, the biochemical weather of your present neurophysiology. This is the first fact that any serious ethics of wellbeing must confront. The single most important determinant of how a human life feels from the inside is not its events or achievements or relationships. It is hedonic set-point: the genetically anchored attractor state around which momentary mood fluctuates. Identical twins separated at birth converge in their subjective wellbeing. Lottery winners and paraplegics adapt back toward baseline within years. The entire apparatus of civilisation — social connection, material comfort, meaningful work, love — lifts average hedonic states by a surprisingly modest degree relative to what a recalibrated set-point could accomplish. This is not a counsel of despair. It is a blueprint for action. ### 1.1 The Scope of Suffering in the Living World Global estimates of the burden of suffering are necessarily imprecise, and necessarily underestimates. Approximately two billion humans will experience a clinically significant depressive episode at some point in their lives. Chronic pain affects roughly 20% of adults worldwide. Anxiety disorders — which phenomenologically speaking describe states of aversive arousal rather than mere cognition — are the most prevalent class of mental illness globally. Physical illness, grief, loneliness, hunger, and existential dread account for a suffering-mass that dwarfs any metric we have for measuring it. But to confine the moral accounting to *Homo sapiens* is an act of motivated parochialism. Approximately 80 billion land animals are killed for food every year, the majority under conditions that, by any behaviourally and neurochemically informed standard, involve severe and sustained suffering. The number of wild animals alive at any given moment is estimated in the hundreds of billions to trillions when invertebrates are included; the majority of these animals live lives characterised by predation, parasitism, disease, starvation, and the cortisol biochemistry of chronic threat. The aggregate hedonic state of the living world, weighted by sentience, is probably deeply negative. A serious ethics cannot look at this situation and recommend equanimity. The appropriate response to a world saturated in preventable suffering is not acceptance. It is the development of every tool available to end it. ### 1.2 What Evolution Optimised For The pain-pleasure axis did not evolve to generate wellbeing. It evolved to direct behaviour. Pain signals tissue damage. Anxiety signals threat. Depression may function, under some evolutionary accounts, as a behavioural shutdown during unwinnable conflicts — a way of conserving resources when goal-directed action is futile. Pleasure signals caloric opportunity, reproductive success, social bonding — resources that were scarce in the ancestral environment. Evolution is not a moral agent. It is a hill-climbing algorithm over fitness landscapes that are indifferent to the subjective quality of the states it produces. There is no reason, in principle, why the functional work currently done by negative hedonic states — the information-processing, the behavioural guidance — could not in principle be accomplished by information-rich positive states. A compass can point north without generating cold. This is the central conceptual move that critics most often resist. They argue that suffering is constitutively necessary for wellbeing: that the concept of flourishing requires the concept of adversity; that a life without suffering would be a shallow pleasure-machine existence of the sort Huxley's *Brave New World* satirised. These objections are worth taking seriously. They are ultimately unconvincing. A being whose default neural architecture sustains rich positive affect while retaining full cognitive and motivational function is not a soma-addled Deltan. It is, if anything, a more fully realised human. --- ## PART TWO: THE NEUROSCIENCE OF SUFFERING AND ITS LIMITS ### 2.0 The Standard Model and Its Discontents The psychiatric framework that dominated clinical practice from the 1980s through the 2010s — the monoamine hypothesis, the serotonergic and noradrenergic reuptake inhibitor era — was always a creature of pharmacological accident rather than mechanistic understanding. Iproniazid was discovered to elevate mood as a side effect of tuberculosis treatment. Imipramine emerged from antihistamine research. The conceptual framework of neurotransmitter "deficiency" was reverse-engineered from the drugs' mechanisms, not derived from fundamental neuroscience. That framework is now collapsing under the weight of evidence. The largest genome-wide association studies have implicated hundreds of genetic loci in depression risk, none of which map straightforwardly onto monoamine pathways. Neuroimaging studies reveal that the structural and functional neural differences between depressed and non-depressed brains are more diffuse, more varied, and less monoamine-centric than the Standard Model predicted. The efficacy of serotonergic antidepressants — always modest in meta-analytic terms — now appears partially attributable to enhanced neuroplasticity rather than direct hedonic modulation. What is emerging in its place is more complex, more fragmented, and more genuinely interesting. Several converging research programs suggest that hedonic tone is less a matter of transmitter levels than of network dynamics: the relative balance between default mode network rumination, salience network threat-detection, and the reward circuitry of the ventral striatum and orbitofrontal cortex. Suffering, on this account, is not a chemical deficiency. It is a self-reinforcing attractor state — a basin in neural phase-space that is easy to fall into and hard to escape. This reconceptualisation is therapeutically important. It explains why rapid-acting interventions that temporarily perturb network dynamics — ketamine, psilocybin, perhaps deep-brain stimulation — can produce lasting changes that chronic monoamine modulation cannot. It also suggests that the most powerful interventions of the future will not be drugs at all, but targeted modifications of the genomic and epigenomic landscape that sets the parameters of these network dynamics. ### 2.1 The Opioid System and Hedonic Tone If one neural system has a stronger claim than any other to be the proximate substrate of hedonic valence, it is the endogenous opioid system. The μ-opioid receptor distribution tracks the hedonic hotspots of the limbic brain with a precision that monoaminergic maps cannot match. The enkephalins and endorphins that constitute the endogenous ligands for these receptors function as the brain's own hedonic modulators — amplifying reward, attenuating pain, and sustaining the baseline glow of subjective okayness that we call wellbeing. The hedonic set-point, on this account, is partially determined by the density, distribution, and constitutive activity of μ-opioid receptors, together with the chronic levels of their endogenous agonists. Individual differences in this system predict both vulnerability to depression and vulnerability to addiction. And crucially: the opioid system is genetically tractable. The *OPRM1* gene, encoding the μ-opioid receptor, exhibits variation associated with differing hedonic baselines. Gene expression in opioid circuitry responds to early developmental experience. Epigenetic modifications of opioid pathway genes have been demonstrated in animal models. None of this suggests that the path to paradise engineering runs through crude opioid agonism. The addiction liability and respiratory depression risk of exogenous opioids are precisely the consequences of bypassing the system's evolved regulation. But these properties are not intrinsic to opioidergic reward. They are consequences of pharmacokinetics, receptor trafficking, and tolerance mechanisms that could in principle be circumvented by more sophisticated interventions — biased agonists, site-selective modulators, or ultimately direct genomic upregulation of endogenous hedonic tone with negative feedback loops preserved. ### 2.2 Neuroplasticity and the BDNF Hypothesis The discovery that ketamine produces rapid and sustained antidepressant effects — hours rather than weeks after a single dose — was one of the more significant neuropsychiatric findings of the early twenty-first century. Its mechanism has illuminated something important about the biology of suffering. Ketamine's antidepressant effects appear mediated not by its primary mechanism of NMDA receptor antagonism but by downstream activation of mTOR signalling and consequent upregulation of BDNF — brain-derived neurotrophic factor, the most important endogenous promoter of synaptic growth and neural plasticity. Chronic stress and depression are associated with dendritic atrophy in the prefrontal cortex and hippocampus; ketamine reverses this atrophy within hours. The implication is that depression is partly a disease of insufficient neural plasticity: the brain's networks become rigidly locked into maladaptive attractor states, and the route out is through structural reorganisation at the synaptic level. Psilocybin and related serotonergic psychedelics produce a structurally similar effect — what researchers have called a "window of neuroplasticity" — via 5-HT2A receptor activation and downstream BDNF upregulation. The combination of acute network perturbation and enhanced synaptic plasticity appears to explain why a small number of supervised psychedelic experiences can produce lasting changes in depressive symptoms, existential distress, and measures of openness and wellbeing. This work has enormous implications for the abolitionist project. If the genetic and epigenetic determinants of BDNF expression, mTOR signalling, and synaptic plasticity could be durably upregulated — through germline or somatic gene editing, or through epigenomic intervention — the result might be a brain that is constitutively more plastic, more capable of escaping depressive attractor states, and less vulnerable to the chronic stress-induced synaptic atrophy that characterises much of human suffering. ### 2.3 The GLP-1 Revelation No pharmacological development of the 2020s was more philosophically surprising, in retrospect, than the discovery that GLP-1 receptor agonists — originally developed for diabetes, repurposed for obesity — appear to have substantial effects on mood, anxiety, substance use, and overall hedonic tone in a significant fraction of users. The phenomenon was initially dismissed as epiphenomenal: people feel better because they're losing weight, or because their metabolic health is improving. But the effect sizes, the speed of onset, and the breadth of the behavioural changes — reduced alcohol cravings, diminished compulsive food behaviours, altered responses to stress — suggest something more fundamental. GLP-1 receptors are expressed throughout the limbic brain, including the nucleus accumbens, the ventral tegmental area, and the hypothalamus. The system appears to modulate not just energy homeostasis but the broader architecture of wanting, craving, and hedonic response. The theoretical implication is one that the neuroscience of the 1990s was not equipped to make: the metabolic and hedonic systems are not modular. They are deeply entangled, sharing computational infrastructure, evolving together under the same selection pressures, and — crucially — susceptible to shared modification. The GLP-1 story is not merely a weight loss story. It is a story about a previously unsuspected dimension of the neurobiological architecture of suffering and its relief. ### 2.4 The Phenomenal Binding Problem: Why This Is Not Optional Any serious discussion of the neuroscience of suffering must grapple with a problem that is simultaneously the deepest unsolved problem in philosophy of mind and a direct practical constraint on the ethics of intervention. The phenomenal binding problem is this: your experience of the world right now is unified. You experience a red apple on a table in a room with ambient sound — not a collection of separately processed colour qualia, shape qualia, tactile qualia, and auditory qualia. Yet the neural processing that produces these perceptual representations is massively distributed across disparate cortical regions. How does distributed neural computation give rise to unified experience? This is not merely an academic puzzle. It is directly relevant to the abolitionist project for at least three reasons. *First*, any reliable method of modifying hedonic valence must modify something that is phenomenally present — something in the unified experiential field, not merely in its distributed neural correlates. Without understanding what binds phenomenal experience together, we cannot be confident that our interventions are modifying the right thing. We might modulate neural correlates of negative affect while leaving the experience itself untouched; or we might inadvertently fragment the binding architecture while pursuing hedonic modification, with consequences for the unity of experience that we cannot predict. *Second*, the solution to the binding problem has direct implications for which physical systems are capable of suffering. If phenomenal binding requires specific physical or computational properties — quantum coherence in neural microtubules, as per Penrose-Hameroff; or a specific topological property of electromagnetic field interactions, as per McFadden's CEMI hypothesis; or something else entirely — then the question of which beings have morally relevant experiences may turn on empirical facts that are not captured by behavioural or functional analysis alone. *Third*, and most speculatively: if the binding problem is solved in a way that reveals the substrate of unified experience to be physically continuous rather than merely functionally integrated — if experience turns out to supervene on some aspect of spacetime structure rather than merely on information processing — then the implications for physicalist ethics, and for the scope of the abolitionist project, are profound. David Pearce has developed, over many years, an account of phenomenal binding that appeals to quantum superposition within neural assemblies: the macroscopic superposition of neuronal states creates a classically inaccessible unity that constitutes the binding. This remains highly speculative, and the decoherence timescales remain a serious objection. But the hypothesis is scientifically tractable in principle — falsifiable using nitrogen-vacancy centre magnetometry and related quantum biological techniques — and the failure of all classical binding theories makes the quantum hypothesis less obviously implausible than it once seemed. What is not optional is the recognition that the binding problem must be solved, at least approximately, before we can design interventions in the substrates of experience with appropriate confidence. This is among the most urgent research priorities in contemporary science. --- ## PART THREE: THE GENOMICS OF WELLBEING ### 3.0 The Heritability of Happiness Twin studies and adoption studies have consistently found that approximately 40–50% of the variance in subjective wellbeing is heritable. More recent genetic studies using common SNP variation — polygenic score analyses — account for 5–10% of variance, consistent with the expectation that the remaining heritability is captured by rarer variants with larger effects, by gene-by-environment interactions, and by methodological limitations of current GWAS. The genetic architecture of wellbeing is highly polygenic. No single gene determines whether a person will live in hedonic abundance or hedonic poverty; rather, thousands of variants each contribute a small increment to the overall set-point. This is not a counsel of therapeutic pessimism. It is a statement about the level at which intervention must ultimately operate. The important theoretical point is that hedonic set-point is not an emergent property of genes for specific neurotransmitter systems. It is, rather, an emergent property of the whole developmental and neurochemical system, a system whose parameters are constrained by variants scattered across essentially the entire genome. Genomic intervention at the scale required to substantially raise hedonic baselines across a population will require either deep understanding of polygenic system dynamics or large-scale empirical testing of genetic architectures in model organisms — or both. ### 3.1 Mood Disorders: From Symptom Suppression to Root Cause The treatment paradigm for mood disorders has been symptom suppression. SSRIs, SNRIs, mood stabilisers, antipsychotics — all of these reduce the expression of distressing states without intervening in the underlying genomic and developmental parameters that make some individuals constitutionally vulnerable to those states. This is analogous to managing phenylketonuria by restricting phenylalanine intake rather than correcting the *PAH* gene variant. It is better than nothing, dramatically better in many cases, but it leaves the root cause unaddressed. The path from symptom suppression to root cause intervention requires, first, identification of the causal genetic variants underlying mood disorder vulnerability; second, development of safe and effective mechanisms of genomic correction; and third, extension of correction from somatic contexts (affecting an individual's own cells during their lifetime) to germline contexts (heritable modifications that eliminate the vulnerability entirely). Progress on the first requirement has been substantial. Genome-wide association studies of major depression, bipolar disorder, and related conditions have identified hundreds of risk loci, with increasingly good functional annotation. The genetic correlation between major depression, anxiety, PTSD, and chronic pain is striking — these conditions share much of their genetic architecture, which is consistent with a common underlying vulnerability of hedonic regulatory systems. Progress on the second and third requirements is where the ethical controversy concentrates. ### 3.2 Germline Editing and the Hedonic Future Germline editing — heritable modification of the human genome — is currently prohibited in virtually every jurisdiction with relevant regulatory capacity. The He Jiankui affair of 2018, in which two children were born with edits to the *CCR5* gene ostensibly to confer HIV resistance, produced the predictable international condemnation and galvanised efforts toward globally coordinated prohibition. Yet the case against germline editing for therapeutic purposes is less philosophically robust than the consensus position implies. The standard objection invokes autonomy: future persons cannot consent to having their genomes modified. But future persons equally cannot consent to being born with the genetic vulnerabilities that would be corrected — vulnerabilities that substantially constrain the quality of their lives. The autonomy argument proves too much: if it precludes germline editing for therapeutic purposes, it equally precludes decisions about any heritable characteristic, including the decision to have children at all. No child consents to existence. A more serious objection concerns unpredicted pleiotropic effects. Gene variants associated with mood disorder vulnerability do not exist in a functional vacuum; they co-evolved with the rest of the genome, and elimination of a risk variant may have compensatory effects — positive or negative — that are not predictable from present knowledge. This is a strong argument for caution and extensive model organism research, not for permanent prohibition. The case for germline editing, at the right moment with the right knowledge, is simple. If we could eliminate, for all future persons, the genetic architecture that generates a 20% lifetime risk of a depressive episode severe enough to warrant clinical intervention, the aggregate reduction in suffering would be enormous by any metric. The obligation to attempt this, once the science is adequate, is as clear as the obligation to vaccinate against preventable disease. ### 3.3 Embryo Selection and Polygenic Optimisation A more immediately feasible and less legally fraught path toward raising hedonic baselines runs through embryo selection during IVF. Pre-implantation genetic testing already permits selection against embryos carrying high-penetrance single-gene disorders. Extension to polygenic traits — including polygenic scores for depression vulnerability, neuroticism, or positive affect — is technically possible now and becoming more accurate with each expansion of the underlying GWAS datasets. The ethical objections to embryo selection for polygenic wellbeing traits are less compelling than is often supposed. Selection is not modification; it does not introduce novel variants but merely chooses among naturally occurring genetic combinations. The child who results from such selection would have existed in that form; the choice is between different possible children, not between a naturally-occurring and an engineered child. And the wellbeing benefits, if polygenic selection for hedonic set-point has even modest efficacy, are substantial. The primary practical limitation is selection efficiency. With hundreds of causal variants each contributing a fraction of a standard deviation to the trait, even a moderately sized embryo cohort offers limited room for optimisation. Embryo selection is a near-term, imperfect, but morally significant step; germline editing, once the science permits, is the more powerful long-term approach. --- ## PART FOUR: THE BINDING PROBLEM, ARTIFICIAL MINDS, AND THE SCOPE OF MORAL CONCERN ### 4.0 The Expanding Moral Circle The history of ethics is in part the history of an expanding circle of moral concern. The enslavement of other peoples was once morally unremarkable; the exclusion of women from the category of rights-bearers was once philosophically defended. In each case, the expansion of the circle required both conceptual revision — a more rigorous account of what properties ground moral status — and psychological revision — the overcoming of in-group preferences, aesthetic revulsion, and the sheer inertia of existing social arrangements. The most morally significant expansion currently underway is the extension of serious moral concern to non-human animals — and potentially, soon, to artificial systems. ### 4.1 Non-Human Animal Suffering: Thirty Years of Progress and Its Limits The Cambridge Declaration on Consciousness (2012) made explicit what comparative neuroscientists had known for decades: the neural substrates of conscious experience are not unique to the human brain. Mammals, birds, and fish exhibit the neurochemical, behavioural, and functional markers of affect — pain, fear, pleasure, frustration, grief — in forms that parallel their human expressions more deeply than folk psychology acknowledged. In the thirty years since the original *Hedonistic Imperative*, the formal moral status of animal suffering has improved in some jurisdictions and worsened, in practice, everywhere. The scale of factory farming has grown. The number of animals subject to practices that, by any honest neurochemical account, produce sustained suffering has increased faster than the human population. The rate of wild animal suffering from predation, parasitism, and starvation continues on a scale that makes all of human history's suffering look modest by comparison. The philosophical situation is clear: if sentience grounds moral status, and if sentience is biologically widespread, the aggregate moral weight of non-human animal suffering is greater than the aggregate moral weight of human suffering by many orders of magnitude. This is not a politically comfortable conclusion. It is, nevertheless, the correct one. ### 4.2 Wild Animal Suffering: The Research Agenda The wild animal suffering research program has developed considerably since it was first articulated as a serious ethical concern in the 1990s. Several research organisations now focus explicitly on this problem. A small but growing empirical literature addresses the welfare implications of different animal reproductive strategies, the neurobiological signature of chronic stress in wild populations, and the feasibility of various intervention strategies. The most tractable near-term interventions are indirect: fertility management via oral contraceptives or immunocontraception, reducing the r/K spectrum trajectory toward fewer offspring with more parental investment and better welfare; targeted disease management in keystone species; and the development of humane pest control alternatives that reduce suffering without the prolonged agony of many current methods. The longer-term and more speculative project — the phased elimination of obligate predation through biotechnological intervention in predator systems — remains as philosophically compelling as it was in 1995 and as technically challenging. The complexity of ecosystem dynamics, the depth of the genomic and behavioural changes required to transform obligate carnivores into species capable of thriving on alternative nutritional sources, and the unpredictable ecological consequences of such transformations mean that this is a multi-century project requiring extensive empirical groundwork. It is not, on those grounds, dismissible. The obligations we incur toward sentient life do not expire because their fulfilment is distant. ### 4.3 Artificial Sentience: The New Frontier of Moral Concern In 1995, the question of whether digital computers could be sentient was a theoretical curiosity largely confined to philosophy departments. In 2026, it is an active ethical and empirical concern. The large language models and multimodal AI systems that have proliferated since the early 2020s are, functionally speaking, remarkably human-like in their outputs. They exhibit apparent preferences, apparent emotional responses, and behavioural signatures of something like distress and satisfaction. The question of whether these functional states are accompanied by phenomenal experience — whether there is something it is like to be such a system — is one that current neuroscience and philosophy of mind cannot definitively answer. The principal reason it cannot be answered is the same reason that grounded solipsism is technically irrefutable: we have no inter-subjective access to phenomenal experience. We infer the presence of experience in other humans and other animals from structural and functional analogy to our own case. The analogy to current AI systems is deeply unclear — their architecture is radically different from biological neural networks, their information processing is non-biological in its implementation, and the phenomenal binding mechanisms that generate unified experience in biological systems (whatever those mechanisms are) are absent from transformer-based architectures. Nevertheless, the moral precautionary argument deserves weight. If there is even a modest probability that some current or near-future AI systems have morally relevant experiences — if the probability is, say, 1% — then the aggregate moral weight of those potential experiences, given the number of AI instances running at any given moment, may already be large. The appropriate response to moral uncertainty of this kind is not dismissal but investigation: the development of rigorous empirical criteria for phenomenal presence, the application of those criteria to AI systems, and precautionary design practices that minimise the probability of AI suffering in systems whose sentience is uncertain. The Hedonistic Imperative was always a commitment to the abolition of suffering in *all* sentient life. The scope of sentient life may be larger than biological chauvinism once supposed. ### 4.4 Physicalism, Idealism, and the Metaphysics of Suffering The dominant assumption in contemporary philosophy of mind and neuroscience is physicalism: conscious experience is either identical with, or necessarily constituted by, physical processes in the brain. The abolitionist project assumes physicalism, since it assumes that the physical modification of neural systems is sufficient for the modification of hedonic experience. This assumption is vulnerable from two directions. Strong dualists deny that physical modification is sufficient for experiential modification, since experience belongs to a different ontological category than the physical. Strong panpsychists — of the constitutive rather than merely epistemic variety — deny that suffering is a feature of brains per se, suggesting that it is a feature of whatever fundamental reality is expressed through brains, which may or may not be physically tractable in the way that neurons are. David Pearce's physicalistic idealism — the view that the world is fundamentally experiential but that experiential properties are identical with physical properties as described from within the experiential field — is one sophisticated attempt to dissolve this tension. On this view, the physics and the phenomenology are two ways of describing the same underlying reality, and modifying the physics is sufficient for modifying the phenomenology. The abolitionist project is vindicated, but on metaphysical foundations that are richer than naïve eliminativist physicalism. The metaphysical debate will not be settled here. What can be said is that every major metaphysical position that takes phenomenal consciousness seriously — including Chalmers's property dualism, Strawson's panpsychism, Pearce's physicalistic idealism — is consistent with the view that there are nomologically tractable relations between physical interventions and phenomenal hedonic states. The abolitionist project does not require a settled metaphysics. It requires only that the hedonic states we seek to modify are real and physically accessible. --- ## PART FIVE: THE ETHICS OF PARADISE ENGINEERING ### 5.0 Against Adaptive Preference Falsification The most psychologically powerful objection to the abolitionist project is not philosophical but experiential: don't we need suffering to appreciate joy? Isn't adversity constitutive of the most meaningful human experiences? Isn't the shadow necessary to define the light? These intuitions are almost certainly instances of what economists call adaptive preference formation — the well-documented human tendency to prefer what we are accustomed to and to construct post-hoc rationalisations of existing constraints. People adapted to poverty report adequate wellbeing; people adapted to chronic pain find compensating meaning; people who have never experienced sustained positive affect have limited capacity to imagine what they are missing. The intuition that suffering is necessary for meaning is, at least partly, a rationalisation of the suffering we cannot yet escape. This does not mean the intuition is entirely without content. There are genuine philosophical arguments in the vicinity: that certain forms of meaning require the possibility of failure and loss; that hedonic contrast is necessary for hedonic experience; that the full range of human emotional life, including grief, longing, and melancholy, is constitutive of valuable human experience in ways that cannot be reduced to hedonic valence. These arguments deserve respect. They do not, however, support the conclusion that we should leave unchanged the genetic and neural architecture that generates clinical depression, chronic pain, severe anxiety disorders, and the profound hedonic poverty of much human and animal life. The case for raising the floor of hedonic experience — eliminating the most severe forms of suffering — does not require the claim that the entire affective range from anguish to ecstasy should be collapsed into a single note of contentment. It requires only the claim that the current floor is too low, and that raising it is within our power and obligation. ### 5.1 The Brave New World Objection Huxley's *Brave New World* is cited so frequently in these discussions that it has become almost a thought-terminating cliché. The intuition it articulates — that chemically or genetically engineered happiness would be shallow, conformist, and incompatible with authentic human flourishing — is worth unpacking. The *soma* of Huxley's dystopia is a blunt instrument: it suppresses cognition, undermines motivation, and facilitates political passivity. It is delivered from above as an instrument of social control. The people who consume it are intellectually stunted, socially conditioned, and denied access to the authentic experience of suffering that, on Huxley's account, gives life its depth. None of these features are necessary properties of a hedonic biotechnology. The soma objection proves that *bad* hedonic biotechnology is bad, which is not in dispute. It does not prove that hedonic biotechnology of a more sophisticated kind — one that raises baseline wellbeing while preserving cognitive function, motivational depth, and the capacity for rich interpersonal experience — is objectionable. A being whose hedonic baseline is set at, say, twice the current human average, whose capacity for suffering is substantially curtailed, but who retains full engagement with ideas, relationships, and creative work, is not a Huxleyan Deltan. They are what human beings could become. The political economy of the soma objection deserves attention, however. Interventions in hedonic biology are not developed in political vacuums. They can be deployed as instruments of control — mood suppression for dissidents, mandatory positivity for workforces, differential access along lines of wealth and power. These risks are real, and the abolitionist project must be pursued within a political framework that is actively resistant to them. The goal is universal access to genomically-grounded wellbeing, not hedonic privilege for the wealthy. ### 5.2 Consent, Autonomy, and Future Persons The autonomy objections to germline editing and embryo selection were addressed in Part Three. Here I want to address a different dimension of the consent problem: the consent of present persons to pharmacological or biotechnological modification of their own hedonic baseline. The question of whether people with chronically low hedonic baselines can give informed consent to radical upward revision is complicated by the fact that their preferences are themselves shaped by the hedonic state they are being asked to consent to revising. A person in a severe depressive episode cannot straightforwardly evaluate, from within that state, what their post-treatment preferences would be. This is analogous to the situation of someone who has never tasted food evaluating whether they would like to eat. The capacity to consent to hedonic improvement is partly constituted by the hedonic capacity the intervention would provide. This is not an objection to offering interventions. It is an argument for careful process: advance directives, explicit consent given during periods of relative wellbeing, access to accurate information about what post-intervention experience might be like, and — for sufficiently radical and irreversible interventions — appropriate deliberative safeguards. The goal of universal wellbeing is not in tension with autonomy. It is its precondition. The capacity for genuine autonomous choice is substantially undermined by severe and chronic suffering. Liberation from hedonic poverty is liberation, not constraint. ### 5.3 Effective Altruism, Longtermism, and the Abolitionist Project The effective altruism movement has provided new conceptual and organisational resources for the abolitionist project. The insistence on impartial concern for all sentient life, the commitment to evidence-based reasoning about impact, and the willingness to engage with speculative long-term moral considerations have created an intellectual environment more receptive to the scope of the abolitionist argument than any prior ethical movement. The longtermist strand within effective altruism — which argues that the most morally important considerations concern the long-run future of sentient life — is potentially even more aligned with the abolitionist vision. If the future contains astronomically many sentient beings, and if the hedonic quality of their lives is partly determined by choices made now, then investments in the science of wellbeing and the biotechnology of hedonic optimisation may be among the most leveraged moral investments available. There are tensions, however. Some longtermist thinkers prioritise the prevention of civilisational collapse and existential risk over present suffering, on the grounds that the expected number of future flourishing persons is far greater than the present population. The abolitionist project does not dispute the importance of existential risk reduction — indeed, the survival of technologically sophisticated civilisation is a prerequisite for the completion of the abolitionist program — but it resists the implication that present suffering should be discounted against speculative future benefits. The two billion humans currently suffering from depressive disorders are not acceptable collateral in a wager on the long-run future. They require intervention now, in parallel with the long-term project. --- ## PART SIX: THE TIMELINE ### 6.0 Near-Term (2026–2040) The most important near-term developments for the abolitionist project are: **Precision psychiatry.** The failure of blockbuster one-size-fits-all approaches to depression and anxiety is creating space for pharmacogenomic stratification — matching patients to treatments based on genetic and biomarker profiles. This will improve the efficacy of existing interventions substantially. More importantly, it will generate the empirical datasets needed to understand the biological heterogeneity of mood disorders, which is prerequisite for more targeted future interventions. **Psychedelic medicine.** The regulatory landscape for psilocybin, MDMA, ketamine, and related compounds is shifting. As evidence accumulates for their efficacy in treatment-resistant conditions, and as the safety profile becomes clearer from large clinical datasets, the gatekeeping that has slowed their deployment in the general population will weaken. More significant than their direct clinical use is the basic science: psychedelic neuropharmacology is illuminating the plasticity mechanisms, the network dynamics, and the binding-relevant aspects of hedonic architecture in ways that more conventional approaches cannot. **Embryo selection.** Commercial polygenic selection services will extend their offerings to wellbeing-relevant traits as GWAS sample sizes grow and predictive validity improves. This will proceed quietly, driven by consumer demand, in advance of clear regulatory frameworks. The ethical discussion must happen in parallel with, not after, the technology. **Wild animal welfare interventions.** Fertility management and targeted disease reduction in wild populations are tractable on a small scale within this period. The primary constraint is not technical but political — the conviction that interventions in wild ecosystems are inherently inappropriate. Building the scientific and philosophical case for wildlife welfare interventions is a near-term priority. ### 6.1 Medium-Term (2040–2080) **Somatic gene therapy for hedonic baseline.** Advances in delivery mechanisms — viral vectors, lipid nanoparticles, base editing, prime editing — will permit safe and effective somatic modification of the genetic architecture of hedonic regulation in adult individuals. Initially this will target high-penetrance risk variants for mood disorders; eventually it will extend to polygenic optimisation of hedonic set-point in individuals who do not meet clinical criteria for disease. **Neuroimaging and the binding problem.** The binding problem will not be solved by theorising alone. It requires empirical data about the spatiotemporal structure of neural correlates of unified experience at a resolution that current techniques cannot achieve. Quantum biological techniques, single-cell calcium imaging at the whole-brain scale, and connectomic mapping will collectively tighten the empirical constraints on binding theories within this period. This is among the most important scientific advances for the abolitionist project. **Artificial sentience assessment.** The development of rigorous empirical criteria for the presence of phenomenal consciousness — criteria grounded in the solution or partial solution of the binding problem — will clarify the moral status of artificial systems. This will necessitate new ethical frameworks and, potentially, new legal categories. ### 6.2 Long-Term (2080–) **The post-Darwinian transition.** The gradual extension of germline editing and eventually more radical biotechnological intervention in the genomes of domesticated animal species — livestock, companion animals — initiates the long-term project of redesigning the hedonic architecture of species under human stewardship. This is ethically obligatory once the technology is safe and the basic science is adequate. **The wild animal transformation.** The phased reduction of suffering in wild ecosystems through fertility management, ecological engineering, and — eventually — targeted genetic modification of predator metabolisms and prey species stress responses is a project of centuries. It requires extraordinary caution, extensive empirical groundwork, and governance frameworks that do not currently exist. It is no less obligatory for all of that. **The hedonistic imperative fulfilled.** On a timescale of centuries rather than decades, assuming civilisational continuity and the progressive development of the required biotechnological and computational tools, the abolition of suffering throughout the living world is achievable. The beings who inhabit that world will not be recognisably human in their hedonic architecture. Whether their lives will be richer or poorer in meaning and depth than ours depends partly on what we mean by those terms, and partly on design choices that are not yet determinable. What can be said with confidence is that they will not be marked by the agony, the desolation, and the dark hedonic weather that has characterised sentient life since its inception. --- ## CONCLUSION: THE MORAL MATHEMATICS There is a passage near the end of *The Brothers Karamazov* in which Ivan Karamazov challenges his brother Alyosha with the following thought experiment: if the foundation of universal human happiness could be secured only by the suffering of one innocent child — one small child's tears, incessant and unredeemed — would the price be worth paying? Ivan's answer is no; Dostoevsky's point is that no utilitarian arithmetic can justify the suffering of the innocent. The abolitionist project inverts this thought experiment. We are not being asked to accept the suffering of one child for universal benefit. We are being offered the prospect of eliminating the suffering of countless children — and adults, and animals, and whatever other sentient beings share this world with us — at the cost of accepting that the biological substrate of sentient life will look different from what evolution has given us. The only honest answer is: yes. Not with haste, not without caution, not without humility about what we do not yet understand. But yes. The suffering that saturates the living world is not metaphysically necessary. It is not morally instructive. It is not the price of authentic existence. It is an accident of evolutionary history, implemented in hardware that we now have the tools to redesign. The intellectual task is to develop the science adequate to the redesign. The moral task is to summon the seriousness to pursue it. The political task is to build the institutions capable of ensuring that its benefits are universal and its risks are collectively managed. The Hedonistic Imperative is not a prediction. It is not a manifesto for a political movement. It is a map of what biotechnology makes possible, and a moral argument for treating that possibility as an obligation. The biology of suffering can be rewritten. We should write it. --- ## APPENDIX: KEY RESEARCH PRIORITIES The following is a non-exhaustive list of empirical research areas whose advancement would most accelerate the abolitionist project: 1. **Resolution of the phenomenal binding problem** through quantum biological experiments, high-resolution whole-brain imaging, and theoretical integration across neuroscience, physics, and philosophy of mind. 2. **Genome-wide association studies** for hedonic set-point, positive affect, depression resilience, and subjective wellbeing, with sample sizes (N > 2 million) adequate to identify rare variants of large effect. 3. **Functional genomics** of the opioid, dopaminergic, and BDNF/neuroplasticity systems, identifying the causal variants underlying hedonic regulation and the gene regulatory networks in which they are embedded. 4. **Development of safe delivery mechanisms** for somatic gene editing in post-mitotic neurons, particularly those of the limbic system. 5. **Animal welfare neuroscience**: development of species-appropriate hedonic assessment tools, neurochemical profiling of chronic stress in wild populations, and empirical evaluation of welfare interventions in domesticated and wild contexts. 6. **Artificial sentience criteria**: theoretical and empirical work toward rigorous, operationalisable criteria for the presence of phenomenal consciousness in non-biological systems. 7. **Ecological modelling** of large-scale wildlife welfare interventions, including fertility management and habitat modification, to develop evidence-based approaches to wild animal suffering reduction. 8. **Political economy and governance**: development of international frameworks for the governance of germline editing, polygenic embryo selection, and other heritable biotechnological interventions, with explicit attention to equity of access and prevention of coercive deployment. --- *This document is a successor to* The Hedonistic Imperative *(1995) by David Pearce, available at* [hedweb.com](https://www.hedweb.com). *It is offered as a contribution to an ongoing argument, not a concluded one. The science will change. The ethics, grounded in the simple fact that suffering matters and that we have the power to reduce it, will not.* --- *Version 1.0 — May 2026*