From one day to the next, you inhabit one body; you have access to one set of memories; your personality, values and appearance hold more or less steady. Other people treat you as a single, unified person — responsible for last month’s debts, deserving punishment or reward for yesterday’s deeds, relating consistently with family, lovers, colleagues and friends. Which of these qualities is the one that makes you a single, continuous person? In ordinary life it doesn’t matter, because these components of personhood all travel together, an inseparable bundle.
But what if some of those components peeled off into alternative versions of you? It’s a striking coincidence that two much talked-about current works of popular culture — the Apple TV+ series “Severance” and the film “The Substance,” starring Demi Moore — both explore the bewildering emotional and philosophical complications of cleaving a second, separate entity off of yourself. What is the relationship between the resulting consciousnesses? What, if anything, do they owe each other? And to what degree is what we think of as our own identity, our self, just a compromise — and an unstable one, at that?
As “Severance” fans prepare for its long-awaited second season, which premieres on Friday, and “The Substance” makes its way through awards season, it’s worth considering why these two stories and the provocative questions they raise have struck such a nerve.
In “Severance,” characters voluntarily undergo a procedure that severs their workday memories from their home-life memories. At 9 each weekday morning, “severed” workers find themselves riding an elevator down to the office, with no recollection of their lives outside of work. These “innies” clock a full workday and then, at 5, ride the elevator back up, only to find themselves riding back down the next morning. Meanwhile, their “outies” come to consciousness each weekday afternoon in the upbound elevator. They live their outside lives and commute back the next morning, entirely ignorant of their innies’ work-time activities.
In “The Substance,” the cleaving works differently: An experimental drug splits users into two bodies, one young and beautiful, one middle-aged or old. They spend a week in each body, while the other lies comatose. The young and old selves appear to have continuous memories (though the movie can be tantalizingly ambiguous about that), but they develop different priorities and relationships. Sue, the younger self of Elisabeth, rockets to Hollywood stardom, while Elisabeth becomes a recluse, discarded by an entertainment industry that reviles aging female bodies.
The question of what makes you “you,” from moment to moment and across a lifetime, has been a subject of intense debate among philosophers. Writing in the 17th century, John Locke emphasized continuity of memory. By his standard, each innie-and-outie pair from “Severance” constitutes two entirely different people, despite their sharing one body. Conversely, Elisabeth and Sue from “The Substance” constitute a single person because they seem to recall some of the same experiences. In contrast, the 20th-century philosopher Bernard Williams prioritized bodily continuity, a perspective that makes an innie-and-outie pair a single person but Elisabeth and Sue two distinct people. The 21st-century psychologist Nina Strohminger and the philosopher Shaun Nichols emphasize continuity of moral values, yielding more complex judgments about these fictional cases. Other scholars view selfhood as a social construct, determined by relationships and societal expectations.
Unsurprisingly, the characters themselves are confused. In “Severance,” the innies sometimes seem to regard the outies as themselves, sometimes as different people, while the outies seem to regard their innies with indifference or worse. Meanwhile, in “The Substance,” mature Elisabeth says of young Sue that “you are the only lovable part of me” — in a single sentence treating Sue both as other and as part of herself.
In real life, such confusion rarely arises because memory, embodiment, personality, values and relationships typically align. Both my wife and the D.M.V. can decide on sight that I’m me, even if they care more about memory, skills and responsibility over time — since they trust in the correspondence of body with mind.
Of course, even outside of science fiction, the correspondence isn’t perfect. Advanced dementia can strip away memory and personality, leaving loved ones to wonder whether the person they once knew still exists. Personality, memory and social relationships can fragment in multiple personality or dissociative identity disorder, raising the question of whether Jekyll should be held responsible for the malevolence of Hyde.
But increasingly, we choose to splinter ourselves. The person you present on Instagram or Facebook is wittier, prettier, more accomplished than the person your spouse or roommate knows. Your 500 “friends” never see your pre-coffee-uncombed-depressed-in-bed self (unless sharing that self is your social media personality — in which case that becomes the curated, theatrical fragment of you). In the 1800s, Karl Marx talked about the alienation of labor; today people talk about not “bringing their whole self” to work. Many of us strive to be one person here, another person there, another person there.
People have always presented themselves differently in different social contexts. But social media, Zoom, photo-editing software and responses filtered through large language models raise our fragmentation to new heights. “Severance” and “The Substance” amplify these fissures through radical new technologies that irreconcilably divide the characters’ home selves from their career selves.
Future technological developments could render this fragmentation an even more acute daily perplexity. Designer drugs might increasingly allow us to switch into one self for work, another for parties, another for bedtime. If artificial intelligence systems ever become conscious — a possibility that neuroscientists, psychologists, computer scientists and philosophers increasingly (but by no means uniformly) take seriously — they too might fragment, perhaps in radical and unfamiliar ways, merging and splitting, rewriting their memories, strategically managing and altering their values and personalities.
Our concepts of personhood and identity were forged by a particular evolutionary, social and developmental history, where body, memory, values, personality and social relationships typically aligned, and exceptions mostly fell into predictable patterns. By inviting us to rethink the boundaries of the self in an era of technological change, “Severance” and “The Substance” disrupt these old concepts. Today they read as dystopic science fiction. Too soon, we may remember them as prophetic.
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