Have you ever walked into a room and immediately known something was wrong? No one said anything unusual, and nothing looked particularly different, but you could still feel it. Something was off.

Maybe you have experienced the same thing when meeting someone for the first time. On the surface, there was absolutely nothing wrong with them, yet something inside you whispered that you shouldn’t trust them. Or perhaps you have known someone was upset before they told you, changed your mind about a decision at the last minute without being able to explain why, or had the strange sensation that you knew what was about to happen.

We have all sorts of names for experiences like these: intuition, instinct, a sixth sense, a premonition, or simply a gut feeling. When one of those feelings turns out to be right, it can feel a little like magic.

Since it is spooky season, I thought October would be the perfect time to explore some of these strange experiences through the lens of neuroscience. I am not interested in using science to explain away experiences that people find meaningful. Instead, I want to explore that wonderfully weird space where things we sometimes call magic overlap with things we are beginning to understand about the brain.

Intuition seems like the perfect place to start because sometimes we recognize something before we can explain how we recognized it.

Your Brain Is Paying Attention Even When You Aren’t

We tend to think of thinking as a conscious activity. We gather information, consider our options, and eventually reach a conclusion. Meanwhile, much of the processing involved in perception and judgment occurs without deliberate analysis.

Think about an ordinary conversation. You aren’t consciously cataloging every change in the other person’s facial expression, posture, tone of voice, cadence, eye contact, and movement. You would never get through a conversation if you tried. Yet all of those things can contribute to your perception of the interaction.

Previous experience matters too. Research on perception has shown that prior knowledge and expectations can influence how we process sensory information. In other words, we don’t encounter every situation as though we have never experienced anything before. What has happened in the past helps shape what we expect in the present.

Some neuroscientists study this through a broader framework known as predictive processing, which proposes that prediction is a fundamental part of how the brain makes sense of incoming information. It is an influential framework, but exactly how broadly it applies and how these predictions are implemented in the brain remain subjects of research. We don’t need to settle that larger debate to recognize something much less controversial: what we have experienced before affects what we expect and perceive now.

Imagine talking with someone you know well. They tell you they’re fine, and there is nothing obviously wrong with the way they say it, but you don’t believe them. Maybe their voice sounds slightly different, their expression isn’t quite what you expect, or there is a hesitation you can’t consciously identify.

You may never deliberately analyze any of those things. Yet together they may create an impression that something isn’t quite right. What feels like intuition may sometimes reflect rapid, nonconscious associations based on information and patterns you haven’t deliberately analyzed.

That can certainly feel like knowing something before you know how you know it.

The Ghosts of Experiences Past

This is where experience becomes particularly important. An experienced nurse may notice something concerning about a patient that a novice overlooks. A teacher may sense that a classroom is about to become chaotic even though everyone is technically behaving. An experienced driver might instinctively slow down around another vehicle without immediately being able to articulate exactly what the other driver did that caused concern.

Researchers studying intuition have described it as involving rapid, nonconscious associations, and expertise appears to matter. When someone has accumulated extensive experience within a particular domain, they have more relevant patterns to draw upon when encountering a new situation.

Psychologist Gary Klein has spent decades studying decisions made by people working in complex, real-world environments. His work on recognition-primed decision-making helps explain how experienced people can sometimes recognize a familiar pattern and arrive at a plausible course of action without consciously comparing a long list of alternatives.

This isn’t psychic ability. It is expertise doing something incredibly efficient.

I don’t think that makes it any less fascinating. Years of experience can influence what we notice and how quickly we recognize meaningful patterns. Sometimes the resulting judgment arrives faster than our ability to articulate why we made it.

Our past experiences become a little like ghosts that follow us into new situations. They influence what catches our attention, what seems familiar, and what feels out of place, even when we aren’t consciously thinking about the past at all.

There Really Is Something to a “Gut” Feeling

The phrase gut feeling is also more scientifically interesting than it sounds. Your nervous system isn’t only processing information coming from the world around you. It is also continually receiving information from inside your body.

Your heartbeat, breathing, temperature, hunger, muscle tension, and signals from your internal organs all provide information about your physical state. The nervous system’s sensing and processing of signals from within the body is called interoception.

This means that the physical component of a gut feeling isn’t necessarily imaginary. Your heart may beat faster, your muscles may tense, or your stomach may tighten as your body responds to what is happening around you. Those bodily signals can then become part of the information involved in how you experience and interpret a situation.

Research has even found connections between interoceptive sensitivity and intuitive decision-making. However, there is a fascinating catch: being more sensitive to bodily signals doesn’t automatically make a person more accurate. Bodily responses can help when those responses contain useful information, but they can also steer decisions in the wrong direction.

Your gut may be talking to you. That doesn’t mean your gut is always right.

I find it fascinating that people were talking about “gut feelings” long before anyone used a neuroscience term like interoception. People recognized that certain kinds of judgments seemed to have a physical component even when they didn’t understand the biological processes involved.

Sometimes we recognize a phenomenon before we understand its mechanism.

Your Inner Witch Is Not Always Right

Unfortunately, the same mind that is remarkably good at recognizing meaningful patterns is also capable of finding meaning where there may not be any.

Expectations can influence what we notice, and previous experiences can influence how we interpret ambiguous information. We may also remember the eerie gut feeling that turned out to be right far more readily than all the uneasy feelings that led absolutely nowhere.

Imagine waking up one morning with the strange feeling that someone is going to call you. The phone rings that afternoon, and suddenly the whole experience feels significant. You may tell that story for years. What you’re less likely to remember are all the mornings when you briefly thought about someone and they didn’t call.

The hits make much better stories than the misses.

Something that feels like intuition can also reflect assumptions or biases rather than useful expertise. Familiarity, anxiety, stereotypes, and previous negative experiences can influence how we interpret a new situation. A person can genuinely feel uncomfortable around someone without that discomfort providing reliable information about the other person’s character or intentions.

The feeling can be real while the explanation we give it is wrong.

That distinction matters, particularly when our intuition involves other people. “Something feels wrong” tells us something about our own internal experience. It doesn’t automatically tell us something true about someone else.

Should You Trust Your Gut?

This is why I’ve never particularly liked the advice to simply “trust your gut.” I don’t think we should automatically ignore it either.

A gut feeling can be information worth noticing, particularly when it occurs in an area where we have significant experience. If you have spent twenty years doing something and suddenly feel that a familiar situation doesn’t look right, there may be value in stopping to figure out what caught your attention.

The important part is figuring it out.

Instead of treating intuition as a verdict, we can treat it as an invitation to become curious. What am I noticing? Is there something unusual here that I haven’t consciously identified? Do I have enough experience with this kind of situation for pattern recognition to be useful? Could fear, assumptions, or previous experiences be influencing my reaction? What other evidence do I have?

Intuition can be the beginning of an investigation rather than the end of one.

This gives us a useful middle ground. We don’t have to assume every gut feeling is mystical guidance that should be followed without question. We also don’t have to dismiss intuition as irrational nonsense.

Sometimes experience may be speaking before we have found the words to explain what it is saying.

But What About the Really Weird Ones?

Of course, some experiences are harder to tuck neatly into an explanation.

Most of us have stories about thinking of someone seconds before they called, choosing not to go somewhere and later being relieved that we didn’t, or having a strange feeling that turned out to correspond with something unexpected. Those are the experiences that make intuition feel less like ordinary pattern recognition and more like something genuinely spooky.

Science gives us several possibilities to consider, including coincidence, probability, selective memory, unconscious cues, previous knowledge, and our tendency to recognize patterns. What science generally cannot do is travel backward into one person’s experience and tell us with certainty exactly what produced a particular feeling at a particular moment.

I think it is okay to leave a little uncertainty there.

One thing that bothers me about conversations involving science and the experiences we sometimes label “woo” is the assumption that we immediately have to choose a side. Either an unusual experience proves something supernatural happened, or science must demonstrate that the person was foolish for finding the experience strange or meaningful.

Those aren’t our only choices.

Sometimes “That was weird. I wonder what happened?” is a perfectly reasonable response.

Maybe the Science Is the Magic

So, is intuition really a sixth sense? We don’t have scientific evidence establishing a supernatural sense that allows people to perceive future events or information unavailable through ordinary sensory processes. But saying intuition is “just your brain” also seems to undersell what our brains and bodies are capable of doing.

Experience can shape perception. We can form rapid associations without deliberately reasoning through them. Our bodies continually send information to our brains, and those signals can influence how we feel and make decisions. Expertise can allow people to recognize meaningful patterns with remarkable speed.

Sometimes the conscious result of all that complexity is nothing more sophisticated than, Something feels weird.

Understanding some of the mechanisms behind intuition doesn’t make it less fascinating to me. It makes me more interested in those moments when I seem to know something before I can explain why. It also makes me more cautious about assuming every strong feeling contains a hidden truth.

There is room for both wonder and skepticism here, and that is exactly the territory I want to explore this October.

Over the next few weeks, we’ll venture a little farther into the neuroscience of woo. We’ll look at why rituals and lucky charms can sometimes affect us, whether believing you are cursed can actually make you feel worse, and why perfectly ordinary places can sometimes feel undeniably haunted.

My goal isn’t to explain away the magic. I want to find out what happens when we look more closely at it.

Because sometimes understanding the trick doesn’t make the magic disappear. Sometimes it shows us just how strange—and wonderful—our brains really are.

References & Further Reading

Craig, A. D. (2002). How do you feel? Interoception: The sense of the physiological condition of the body. Nature Reviews Neuroscience, 3, 655–666. https://doi.org/10.1038/nrn894

Dane, E., & Pratt, M. G. (2007). Exploring intuition and its role in managerial decision making. Academy of Management Review, 32(1), 33–54. https://doi.org/10.5465/AMR.2007.23463682

Dane, E., Rockmann, K. W., & Pratt, M. G. (2012). When should I trust my gut? Linking domain expertise to intuitive decision-making effectiveness. Organizational Behavior and Human Decision Processes, 119(2), 187–194. https://doi.org/10.1016/j.obhdp.2012.07.009

de Lange, F. P., Heilbron, M., & Kok, P. (2018). How do expectations shape perception? Trends in Cognitive Sciences, 22(9), 764–779. https://doi.org/10.1016/j.tics.2018.06.002

Dunn, B. D., Galton, H. C., Morgan, R., Evans, D., Oliver, C., Meyer, M., Cusack, R., Lawrence, A. D., & Dalgleish, T. (2010). Listening to your heart: How interoception shapes emotion experience and intuitive decision making. Psychological Science, 21(12), 1835–1844. https://doi.org/10.1177/0956797610389191

Khalsa, S. S., et al. (2018). Interoception and mental health: A roadmap. Biological Psychiatry: Cognitive Neuroscience and Neuroimaging, 3(6), 501–513. https://doi.org/10.1016/j.bpsc.2017.12.004

Klein, G. (1998). Sources of Power: How People Make Decisions. MIT Press.