From Enhanced Human to Posthuman

Push past repair and you reach enhancement proper: interventions meant not to restore a function but to extend it beyond the species norm. Baertschi sorts them into the familiar families. Physical enhancement, like the endurance a doped athlete gains. Cognitive enhancement, the stimulants and future drugs that sharpen memory or attention in already-healthy brains. Mood and emotional enhancement, where a substance does not treat depression but simply makes an untroubled person feel better. And moral enhancement — the most startling idea — where we would use biology to make people more empathetic or less aggressive.

The objections arrive quickly, and Baertschi takes them seriously rather than dismissing them. One is about authenticity: a self improved by a pill, the worry goes, is no longer quite your self; the achievement is the drug's, not yours. Another is about fairness: if enhancement is expensive, it widens the gap between those who can afford a better brain and those who cannot. A third is older and vaguer — the sense that we are overstepping, playing at being more than human, reaching for what some would call hubris.

Enhancement improves humans. The posthuman is something else: a being that no longer counts as human at all, because the improvements have gone far enough to change the kind of thing it is. Baertschi takes the idea seriously as philosophy, not spectacle. Transhumanist thinkers — Nick Bostrom and Julian Savulescu among the most cited — argue that nothing sacred attaches to our current biology, and that a creature with vastly longer life, far greater intelligence, or emotional range we can barely imagine would not be a monster but a successor worth welcoming.

The leap raises a question enhancement alone never forced: what makes someone a person, and does it survive the transformation? Baertschi's answer leans on continuity of mind rather than of body. If a being remembers being you, pursues the projects you cared about, and relates to others as a moral agent, the fact that its substrate has been radically altered may not break the thread of identity. On this view the posthuman is not the end of us but a continuation under new conditions — the way an adult is continuous with the child who no longer exists.

Step back from any single drug or implant and look at the line itself — therapy on one side, enhancement on the other — and notice how it keeps moving. What counted as enhancement a generation ago often counts as ordinary care now. Vaccination once looked like meddling with nature's design; today refusing it looks like negligence. Correcting vision, managing cholesterol, fertility treatment — each migrated from the suspect column to the routine one. Baertschi's deeper point is that the boundary is not a fact we discover but a decision we keep renegotiating, usually without noticing we are deciding.

This matters because the line is doing heavy institutional work. Insurers use it to decide what they will pay for. Regulators use it to decide what is medicine and what is lifestyle. Ethicists use it to sort the permitted from the frowned-upon. All of that machinery rests on a distinction that, pressed hard enough, turns out to track our evolving judgments about what a good human life requires — not a stable fact about bodies. When the therapy-enhancement line moves, it is because we moved it, often in response to what has simply become available.

Return to the two patients on the operating table — the child with the cleft palate and the adult after a sharper jaw. Baertschi's road from the clinic to the posthuman shows that our instinct to separate them was never resting on the firm biological ground we assumed. Health is partly a statistical convention and partly a moral one; the baseline bends; the vocabulary of disease smuggles in values while claiming to report facts. The line between healing and improving is real enough to use, but not solid enough to settle an argument on its own.