The Psychology of Luck: Why We Believe in Lucky Numbers, Charms, and Rituals

Somewhere right now, someone is knocking on wood, skipping the thirteenth-floor button in an elevator, or quietly reciting a lucky number before hitting submit on a lottery ticket. These small bargains with chance show up in nearly every culture on Earth, even though the specific numbers, colors, and objects involved rarely agree with each other. The number that unsettles a Roman is unremarkable in Tokyo; the number that comforts a Chinese business owner sounds, in Japanese, uncomfortably close to the word for suffering.

None of this makes superstition simple foolishness to be corrected. Decades of research in behavioral and cognitive psychology have mapped, in real experiments with real data, how superstitions form, why they persist, and why believing in luck can measurably change how well people perform — without the luck itself being real. The causal story ("this number bends probability in my favor") isn't supported by physics or statistics. But the psychological story underneath it, involving conditioning, confidence, and a well-documented human bias toward feeling in control, is real and worth taking seriously.

This piece walks through that research: B.F. Skinner's 1948 pigeon experiment on how "superstitious" behavior gets built from pure coincidence, a University of Cologne study on how lucky charms and rituals can genuinely improve task performance, a tour of lucky and unlucky numbers across cultures that goes beyond the usual 4-8-13 list, what sport psychology documents about pre-game rituals, and the "illusion of control" — a real, named concept from psychologist Ellen Langer that helps explain why belief in luck persists even in people who know, intellectually, that it shouldn't work.

In 1948, B.F. Skinner published a short, strange paper in the Journal of Experimental Psychology titled "Superstition in the Pigeon." He placed hungry pigeons in his now-famous operant conditioning chambers and set a mechanism to dispense food at fixed time intervals, regardless of what the pigeon was doing. He wasn't rewarding any particular behavior; the food simply arrived on a timer. Yet within a short time, most of the pigeons had developed distinct, repeated movements — one turned counterclockwise around the cage between deliveries, another thrust its head into an upper corner, another swayed in a pendulum-like motion.

Skinner's explanation was that whatever behavior a pigeon happened to be performing when food arrived got adventitiously reinforced — strengthened purely by coincidental timing — making the pigeon more likely to repeat it, and more likely to be doing that same behavior the next time food arrived. He called it "superstitious" because the pigeon behaved as if its actions controlled the food delivery, when the schedule was actually fixed and indifferent to anything the bird did.

The experiment is still cited as a foundational model of how random reinforcement can manufacture behavior that looks purposeful even when it isn't. But the analogy to human superstition shouldn't be oversold. A 1971 reanalysis by John Staddon and Virginia Simmelhag argued that much of what Skinner observed reflected pigeons' innate feeding-related behaviors rather than pure operant conditioning, and human superstition involves things pigeons don't have — language, storytelling, and explicit causal beliefs passed between people. Skinner's pigeons show that coincidental reinforcement can shape behavior; they don't, by themselves, explain the richer superstitions humans build around specific numbers and rituals.

The clearest evidence that believing in luck can change real-world outcomes comes from a 2010 study by Lysann Damisch, Barbara Stoberock, and Thomas Mussweiler at the University of Cologne, published in Psychological Science as "Keep Your Fingers Crossed! How Superstition Improves Performance." In one experiment, golfers putting on an artificial green sank significantly more putts when the experimenter mentioned that the ball they'd been given "has turned out to be a lucky ball" than when nothing was said about the ball at all — same ball, same green, different sentence.

In follow-up experiments, the researchers found the same pattern with other rituals: participants told the German equivalent of "I'll keep my fingers crossed for you" did better on a memory game and a motor-dexterity task, and people who brought a personal lucky charm to the lab outperformed those whose charm was taken away before the task. Across the studies, the effect ran through measurable psychological variables rather than magic: activating a luck-related belief raised participants' self-reported self-efficacy, and that boost was linked to higher goals, longer persistence, and better performance.

It's worth being straightforward about the evidence here: this is one influential study, not an unshakeable law. A 2014 replication published in Social Psychology found the same direction of effect but weaker and less consistent results, and some statisticians have questioned the size of the original effects. That's normal, healthy science — a reminder that "luck improves performance" is a live research question, not a settled fact. The self-efficacy mechanism it points to, though, is one of the best-supported ideas in performance psychology, whatever triggers it.

Beyond the familiar cases of 4, 8, and 13, numeral superstition is a worldwide habit, and the less-discussed examples make something clear: what makes a number lucky or unlucky is almost always about language and history, not the number itself. In Italy, the number many people avoid is 17. The likely explanation is old and linguistic: written as the Roman numeral XVII, seventeen rearranges into VIXI, Latin for "I have lived" — a phrase used on gravestones to mean, in effect, "my life is over." Some Italian hotels and airlines skip a 17th floor or row, and Friday the 17th, rather than Friday the 13th, is the date many Italians treat with extra caution.

Japan supplies a different, equally language-rooted case. The number 9 is pronounced "ku," which also means suffering or agony, so along with 4 (pronounced "shi," echoing the word for death) it's often skipped in hospital room and floor numbering. Cross into Chinese, though, and the story flips: 9 (jiǔ) is a near-homophone for a word meaning "long-lasting" or "eternal," making it one of the most auspicious numbers in Chinese culture, historically tied to the emperor. Same digit, neighboring cultures, opposite meanings — purely because of what it sounds like in each language.

The number 3 shows a more widely positive pattern, for varied reasons: it anchors the Christian Trinity, underlies the English idiom "third time's the charm," and in Chinese carries a mild positive association because "three" (sān) sounds close to a character meaning "life" or "birth." Storytellers across unrelated traditions also lean on three-part structures — three wishes, three trials, three brothers. None of this reflects a property of the numbers themselves; a "lucky" or "unlucky" number is really a record of what that sound has meant, historically, in a particular language.

Superstition doesn't distribute evenly across situations — it clusters exactly where you'd expect if it serves a psychological function: high stakes paired with low actual control. The pattern was first documented systematically in the field by anthropologist Bronisław Malinowski, who observed that Trobriand Island fishermen used elaborate ritual before setting out onto the dangerous open ocean but used almost none before fishing the calm, predictable lagoon. Decades later, anthropologist George Gmelch applied the same logic to American baseball in his widely cited paper "Baseball Magic," finding that batting and pitching — high-uncertainty, high-failure tasks — attract far more personal rituals and lucky objects among players than fielding routine plays, which are comparatively safe and predictable.

Professional sports still supply the best-documented modern examples. Hall of Fame third baseman Wade Boggs became known, in reporting corroborated across decades of sports journalism and by Boggs himself, for eating chicken before every game along with dozens of other fixed pre-game habits over his career. Sport psychology researchers have studied this kind of behavior directly: a 2025 scoping review in the International Review of Sport and Exercise Psychology, surveying the research literature on athletes' superstitions and rituals, found such behaviors widespread at every level of competition and generally associated with reduced pre-competition anxiety and a stronger sense of perceived control.

Coverage of this research in outlets like the Association for Psychological Science's Observer has made a similar point: a ritual doesn't change the physics of a free throw or a golf swing, but a consistent, personally meaningful routine beforehand can narrow attention and interrupt anxious rumination — the same psychological terrain Damisch's lucky-ball studies mapped in a lab setting.

The broadest explanation for why lucky-number and lucky-charm beliefs persist comes from psychologist Ellen Langer's 1975 paper "The Illusion of Control," published in the Journal of Personality and Social Psychology. Langer demonstrated that people reliably overestimate their influence over outcomes actually determined by pure chance, especially when the situation includes cues normally associated with skill — making an active choice, competing, practicing, or simply feeling familiar with the materials. In one of her best-known demonstrations, people allowed to choose their own lottery ticket demanded significantly more money to sell it back than people simply handed a ticket, even though a chosen ticket and an assigned ticket have identical odds.

Picking a "lucky" number, carrying a charm, or running through a private ritual before a big moment fits the same pattern: it turns a passive, uncertain wait into something that feels active and effortful — precisely the ingredient Langer found drives the illusion of control. That feeling doesn't change the odds of a coin flip or a hiring decision. But it does something real in the person doing it: the same reduction in anxiety and boost in confidence documented in the Damisch studies, delivered through a sense of agency rather than through the object or number itself.

Put together, the research points to a consistent functional story: superstitious beliefs and lucky-number rituals cost little, reduce the discomfort of genuine uncertainty, and hand people a felt sense of agency in situations — an exam, an interview, a playoff game — where actual control is limited. That psychological payoff is real and worth respecting, even though the causal claim behind it isn't something cognitive science or physics supports.

None of this research requires anyone to give up a lucky number, a favorite pair of socks, or a pre-exam ritual. The honest position is a narrower one: the belief that a specific number or object literally changes probability isn't supported, but the psychological experience of feeling luckier — calmer, more confident, more in control — is real, measurable, and can modestly improve performance on tasks that involve skill, focus, or nerve. Those are two different claims, and conflating them is where most confusion about "luck" comes from.

It's also worth noticing how culturally specific the actual numbers and objects turn out to be. A belief that feels ancient and self-evidently true inside one culture — that 4 is dangerous, that 17 is cursed, that 9 is blessed or doomed — usually turns out, on inspection, to be a local artifact of language and history rather than a universal law the rest of the world just hasn't noticed. That doesn't make the feeling any less real for the person who has it; it just means the "why" is closer to linguistics and cultural history than to anything in the number itself.

• Superstition in the Pigeon (Skinner, 1948) — PubMed
• Keep Your Fingers Crossed! How Superstition Improves Performance (Damisch, Stoberock, & Mussweiler, 2010) — Psychological Science
• Replication of the Superstition and Performance Study by Damisch, Stoberock, & Mussweiler (2010) — Social Psychology
• The Illusion of Control (Langer, 1975) — full text PDF
• Why 17 Is Unlucky in Italy — An American in Rome
• Lucky vs Unlucky Numbers in Japan: A Cultural Guide — Lingualift
• Silly Sports Rituals? Think Again — APS Observer
• Playoff Beards and Unwashed Uniforms: A Scoping Review on Athletes' Superstitions and Rituals — International Review of Sport and Exercise Psychology
• Baseball Superstition (Gmelch's "Baseball Magic"; Wade Boggs) — Wikipedia