Have you ever been in the middle of something—cooking dinner, answering an email, walking through a park—and suddenly, without warning, a secret you've been keeping slams into your thoughts like an uninvited guest? You didn't ask for it. You didn't plan it. But there it is, heavy and familiar, pulling your mood down a notch or two.
Welcome to FreeAstroScience, where we believe complex ideas deserve simple words. We're glad you're here. Whether you stumbled upon this page or came looking for answers, you're not alone in this. We all carry secrets—on average, about nine of them at any given time. And a groundbreaking new study from the University of Melbourne and Columbia University is finally shedding light on why those secrets keep replaying in our heads, and what that does to our emotional well-being.
Stick with us through this article. By the end, you'll understand the hidden machinery behind your wandering mind, and you might even feel a little lighter knowing that science has your back.
The Hidden Weight of Secrets: What New Research Reveals About Your Wandering Mind
We've all got them. Hidden in the quiet folds of our daily lives, secrets sit like stones in our pockets—sometimes barely noticeable, sometimes impossible to ignore. A lie we told years ago. A financial worry we haven't shared with our partner. A desire we've never spoken aloud. They live in us, and according to a rich new body of research, they don't just sit there quietly.
They move. They surface. They grab hold of our attention when we least expect it.
A January 2026 preprint by Valentina Bianchi and colleagues at the University of Melbourne—in collaboration with Michael Slepian at Columbia Business School—offers the most detailed look yet at how and why secrets replay in our minds, and what that mental replay does to our emotions . Their work, currently under review at the Journal of Personality and Social Psychology, draws on two intensive longitudinal studies and hundreds of participants to paint a picture that's both scientifically rigorous and deeply human.
Let's walk through what they found.
How Many Secrets Does the Average Person Actually Keep?
Here's a number that might surprise you—or might not, depending on how honest you're being with yourself right now.
In Study 1, participants held an average of 8.9 types of secrets. In Study 2, that number climbed to roughly 10.85 . The IFLScience summary rounds this to about nine "moderately significant" secrets per person .
That's not nine tiny white lies. These are things people rated as moderately to highly significant on a 7-point scale (averaging 5.50 in Study 1 and 5.03 in Study 2). And here's the emotional kicker: participants felt quite negative about their most important secret—scoring only 2.70 out of 7 on a scale from "very negative" to "very positive" .
So we're not talking about hiding a surprise birthday party. We're talking about things that weigh on people. Real things. Things that matter.
And you're carrying roughly nine of them right now.
What Are the Most Common Types of Secrets We Hold?
The researchers used the Common Secrets Questionnaire (CSQ), a validated 38-category tool originally developed by Slepian and colleagues in 2017. Participants indicated which categories of secrets they'd held—and the results were remarkably consistent across both studies .
Why Do These Particular Secrets Top the List?
Look at that table again. Lies. Body image. Money. Romance. Sex. These aren't exotic categories. They're about as human as it gets. They cut right to the core of how we see ourselves and how we fear others will see us .
The researchers noted that people's recurring thoughts about what others might think of the secret suggest a social-evolutionary function at work. We're wired—on some deep level—to protect our social standing. Keeping certain information hidden can preserve relationships, maintain reputations, and avoid painful social consequences .
As the IFLScience article puts it: "Secrets aren't just a problem for whoever is being kept out of the loop; they can weigh down the secret-holder, too" .
How Often Do Secrets Actually Cross Your Mind?
Here's where things get interesting—and a little unsettling.
Previous research by Slepian and colleagues (2017) found that mind-wandering episodes about secrets are twice as frequent as actual concealment episodes . That means you're thinking about your secret far more often than you're actively hiding it from someone.
A related earlier study (Bianchi et al., 2025) found that people thought about their most important secret roughly 31 times per week—that's about once every two hours .
Think about that for a moment. Every two hours, on average, your secret taps you on the shoulder.
And the problem? Most of those taps aren't ones you asked for.
Spontaneous vs. Deliberate: Two Very Different Beasts
This is the heart of the new research, and it's where things get genuinely surprising.
The researchers distinguished between two types of mind-wandering:
- Spontaneous mind-wandering — your secret barges into your thoughts without permission, like while you're trying to focus on work or enjoy a meal.
- Deliberate mind-wandering — you choose to think about your secret, perhaps to daydream about it or to work through a related problem.
In Study 1 (240 UK participants, 14 days, 2,764 daily surveys), people reported mind-wandering to their secrets significantly more spontaneously than deliberately (b = 14.28, p < .001) .
In Study 2 (207 Australian participants, 7 days, 8 surveys per day, 7,538 total observations), the gap narrowed. There was no statistically significant difference between the two types (b = 3.31, p = .067) .
Why the discrepancy? The researchers offer a clever explanation. Study 1 asked people to report once per day—covering 24 hours of experience. Study 2 asked eight times per day—covering roughly 2-hour windows. It may be that spontaneous thoughts are more memorable and easier to recall over long periods, while deliberate episodes get underreported when people think back over a full day .
Spontaneous mind-wandering to secrets was significantly higher than deliberate mind-wandering in Study 1:
This means, on a 0–100 scale, participants rated spontaneous mind-wandering about 14 points higher than deliberate, on average.
What's the takeaway? The lion's share of your interactions with your own secrets aren't chosen. They're involuntary. Your secret doesn't wait for an invitation—it just shows up.
What Do People Actually Think About When Secrets Surface?
Study 1 didn't just track how thoughts arrived—it also explored what those thoughts contained. Each day, participants selected from a list of thought categories related to their most important secret .
A few things jump out.
Worrying dominates. On nearly a third of all surveyed days, people reported thinking about worries or concerns related to their secret. Sixty-three percent of all participants worried about their secret at least once during the two-week period .
Social judgment looms large. A full 70% of participants thought at least once about what others might think of the secret—the highest person-level frequency in the entire table .
Concealment is rare. Only 11% of surveys and 36% of participants involved thoughts about hiding the secret. And just 5% of surveys involved thinking about revealing it .
This is a big deal. For years, secrecy research conflated keeping a secret with concealing it in conversation. These data show that the real burden happens between conversations—in the privacy of your own mind .
As Bianchi and colleagues write: "People focus more on general concerns about the secret and the social impact of their secret than on ways to regulate who does (not) know the secret" .
Does Mind-Wandering to Secrets Really Hurt Your Well-Being?
Short answer: yes. But not all mind-wandering hurts equally.
Across both studies, spontaneous mind-wandering to secrets was consistently tied to greater negative emotion—both within a given person over time, and between people who varied in how much their minds wandered .
Here's what that means in plain terms:
- On days when your secret popped into your head more than usual (without you choosing to think about it), you likely felt worse about it.
- People whose minds wandered spontaneously to secrets more than others generally felt more negative overall .
And the pattern held up under every statistical test the researchers threw at it.
In Study 2's most conservative analysis—lagged models that tested whether spontaneous mind-wandering at one timepoint predicted negative emotion roughly two hours later, even after accounting for how negative you already felt—the effect was still significant (b = 0.04, p = .028) .
That's a small but persistent effect, and it tells us something powerful: spontaneous thoughts about secrets aren't just a reflection of feeling bad. They cause you to feel worse later.
The Vicious Cycle Nobody Talks About
Here's where the story gets darker—and where the science gets really illuminating.
The robustness checks in Study 2 tested the relationship in both directions. And what they found was a cyclical pattern :
- When you feel more negative than usual about your secret → your secret is more likely to pop into your mind spontaneously.
- When the secret pops in spontaneously → you feel more negative about it, both in the moment and two hours later.
- That increased negativity → makes the secret more likely to pop in again.
Round and round it goes.
The researchers call it a "vicious cycle concerning negative cognitive and emotional processes about the secret" . Psychologists Eric Klinger (1978) and Edward Watkins (2008) theorized about exactly this kind of loop decades ago—unresolved concerns stick to the mind, provoke bad feelings, which in turn make those concerns stickier—but until now, empirical evidence for the cycle was thin .
This study provides some of the first real-world proof that the loop exists, operates across hours, and is specifically driven by spontaneous (not deliberate) thoughts.
⬇️ Secret pops into your mind spontaneously
⬇️ Feeling even more negative (hours later)
🔁
Supported by concurrent, robustness, and lagged analyses in Study 2 (Bianchi et al., 2026 preprint)
Can Thinking About Your Secrets on Purpose Actually Help?
If spontaneous mind-wandering is the villain of this story, deliberate mind-wandering is the more complicated character.
In both studies, deliberate mind-wandering was linked to feeling more positive about one's secret in the moment . People who chose to think about their secrets reported greater positive emotion—both on specific occasions and as a general tendency.
And when people deliberately turned their thoughts to a secret, they were more likely to be fantasizing or daydreaming about it—not worrying .
Here's a telling contrast from the data:
- Spontaneous mind-wandering → greater odds of thinking about worries and concerns (both within and between participants, p < .001) .
- Deliberate mind-wandering → greater odds of fantasizing or daydreaming (both within and between participants, p < .001), and lower odds of worrying (p < .004) .
As the researchers put it: "Negative content like worries appears to intrude on people's minds unbidden, whereas fantasies about secrets are brought to mind more deliberately" .
But don't assume deliberate thinking is all sunshine. In Study 2's concurrent analyses, deliberate mind-wandering also predicted greater negative emotion in the moment (p < .001) . The picture is mixed. When you choose to think about a painful secret to process its meaning—to really sit with it—that engagement might sting right now, even if it could help in the long run .
The good news? Unlike spontaneous mind-wandering, deliberate mind-wandering showed no lasting emotional toll. It didn't predict how you'd feel two hours later . Its emotional footprint is briefer. Less sticky. More contained.
What Can We Actually Do About It?
This is where the research, while still young, starts to point toward real-world strategies.
The researchers suggest that different types of mind-wandering call for different interventions :
For spontaneous mind-wandering — the kind that sneaks in and drags your mood down — strategies focused on redirecting attention may help. When the secret barges in, gently shifting your focus to a present-moment task or sensation could break the cycle before it spirals.
For deliberate mind-wandering — the kind you choose — approaches that emphasize structured reflection and constructive processing might be more fitting. Think of it as steering your thoughts toward resolution rather than rumination .
The researchers also highlight cognitive reappraisal—reframing how you think about a situation—as a potentially powerful tool for managing secrecy-related distress. Yet they note that previous work (Bianchi et al., 2024) found people rarely use reappraisal when dealing with their secrets .
That's a gap worth closing.
If you're carrying a secret that haunts you, you don't have to suffer the loop in silence. Recognition is the first step. Just knowing that spontaneous thoughts are the ones most likely to drag you down—and that this is a normal psychological process, not a personal failing—can itself be a kind of relief.
Final Thoughts
We're all secret-keepers. Every single one of us. The average person carries about nine secrets of moderate importance, and those secrets don't just sit dormant. They surface spontaneously—about once every two hours—and when they do, they tend to bring worries, social fears, and negative feelings along for the ride .
This new research from Bianchi and colleagues—across 447 participants, 10,302 data points, and weeks of real-life tracking—gives us the clearest picture yet of how secrets live in our minds. Spontaneous mind-wandering to secrets feeds a cycle of negative emotion that can persist for hours. Deliberate mind-wandering, by contrast, is more emotionally contained and sometimes even accompanied by positive feelings like daydreaming .
The study has limits, of course. Both samples came from Western, educated populations (UK and Australia), and the work is still a preprint under peer review . It focused on each person's single most important secret—so we don't yet know how different types of secrets might behave differently in the mind. And because the data is observational, we can describe cycles and associations, but not pin down hard causation.
Still, the message is clear: the burden of secrets isn't mainly about hiding them from others. It's about the uninvited way they replay in your own mind.
And that's something we can start learning to manage.
This article was written specifically for you by FreeAstroScience.com, where we explain complex scientific principles in simple, honest language—whether the subject is black holes or the black boxes of the human mind. At FreeAstroScience, we believe in one thing above all: never turn off your mind. Keep it active. Keep it curious. Keep it questioning. Because as Francisco Goya once reminded us, the sleep of reason breeds monsters.
If a secret is weighing on you today, know this: you're not broken. You're human. And science is working hard to understand exactly what you're going through.
Come back to FreeAstroScience.com anytime. There's always more to learn, more to question, and more to discover—together.
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