‘He has a seriously creepy vibe. I’m not going anywhere with him.’
‘This seems like phishing. I wouldn’t click that link.’
‘Something about this deal feels off. Walk away.’
When people say such things, they are not typically drawing conclusions from a chain of reasoning. The person who avoids getting in the stranger’s car is not thinking: ‘He displayed these three behavioural cues and, therefore, he poses a risk.’ The email isn’t flagged by going through an explicit checklist. The deal doesn’t announce its flaws through a formal audit. In each case, something is simply presented as having a certain character: the man as creepy, the email as fraudulent, the deal as suspect. And yet, acting on these intuitions seems not merely excusable but entirely reasonable. If the man really does strike you as creepy, staying out of his car was probably the smart call – even if you can’t say why.
Despite this, ‘vibes’ and ‘intuitions’ are often dismissed both in daily life and in academic enquiry as irrational or merely heuristic devices. And while we cannot always trust such reactions, they are central, indeed indispensable, to our ability to rationally navigate the world. Philosophers, however, have done surprisingly little to illuminate the rational credentials of these ordinary kinds of intuitions. Instead, they have focused the bulk of their attention on a much more rarefied kind of intuition called rational intuition, which is taken to function primarily in the a priori disciplines of philosophy, logic and mathematics.
My objective is to explain why our everyday intuitive reactions can have such rational force. The key is to see that intuition works in much the same way as perception, in that both can directly present something to us as actual. Once we understand what gives perception this feature, we can see why intuitions might involve exercising the same basic kind of cognitive capacity.
A standard way of characterising rational intuition is in terms of seemings, by analogy with perception. Just as it perceptually seems to you that there is a car in the garage, so it can intellectually seem to you that 2 + 2 = 4 – the former presenting a physical fact, the latter a conceptual one. But rational intuition and the everyday intuition at work when you decline to get in a stranger’s car are not as far apart as this rarefied example suggests: the philosopher’s intuition is, at bottom, a highly specialised version of the same basic capacity.
To draw these two capacities together, let’s consider a favourite pastime of philosophers: the thought experiment. Philosophers have a penchant for exotica, which is never more clearly on display than in their invocation of thought experiments. Consider two cases that have occupied philosophers for decades – one from ethics, one from the theory of knowledge.
In the trolley problem, the philosophers Philippa Foot and Judith Jarvis Thomson imagined a runaway trolley hurtling toward five people tied to the track. You are standing on a bridge above, next to another bystander. The only way to stop the trolley and save the five is to push the bystander off the bridge. If you do, his body will halt the trolley, but he will die as a result. Many people feel, immediately and forcefully, that pushing him is wrong, even if it saves five lives. But why?
We routinely entertain alternative possibilities in ordinary life
Or consider Carl Ginet’s case involving fake barns. Imagine you are driving through the countryside and see a barn. It looks exactly like a barn; you’re paying attention, the light is good. You form the perfectly reasonable belief that this is a barn. What you don’t know is that you’re in ‘fake-barn country’: the region is dotted with elaborate barn facades, indistinguishable from real barns when viewed from the road. You happen to be looking at the one real barn in this area. Your belief is true, and it seems justified. And yet almost everyone who considers this case has the immediate, firm sense that you don’t really know it’s a barn. But why not?
To sceptics and the uninitiated, these thought experiments can seem fantastical. Because we encounter them in their most dramatic forms, like runaway trolleys and fake barns, thought experiments seem exotic. But properly understood, these imaginative episodes are important tools for sharpening our grasp of key concepts. In fact, their functioning is continuous with something far more familiar: the way we routinely entertain alternative possibilities in ordinary life, wondering what might happen if we take one path rather than another in the proverbial fork in the road.
These imaginings are just thought experiments as they appear in everyday life. Imagine you are deciding whether to tell a friend that his husband has been unfaithful. You picture the conversation, the shock, the hurt that registers on his face. And in that imagined moment, you see that causing such pain is a reason to hold your tongue, even if it’s not a good or decisive one.
How did you determine that this was a reason against divulging the infidelity? It’s not as if you literally see that causing pain is a reason not to do something, nor do you infer it from other things. Rather, in entertaining the possibility, you apprehended his pain as a relevant consideration, as something that counts against disclosure. Its status as a reason emerged not from an argument, but directly from your understanding. It just seems like a reason to hold your tongue.
Intuition’s verdicts simply present themselves, with no organ at work
Notice that this phenomenon also occurs in the thought experiments discussed above. It just seems wrong to push the bystander from the bridge; similarly, it just seems false that you would know it was a real barn in fake-barn country. In both cases, the answer doesn’t arise from an argument. These intuitions arrive unbidden, prior to any deliberation.
These seemings have an unmistakable epistemic pull. Because your friend’s pain seems like a reason, we accept it as such: the seeming is the reason. What is striking is not simply that we have such seemings, but that we trust them. They are involved in shaping our deliberations, guiding our actions, and eliciting belief. They do not merely occur to us; they appear to reveal something about how things must be in the imagined scenario.
For all their ordinariness, however, intuitions remain puzzling. In perceptual experience, we at least have an established framework: the world impinges on our senses, and different perceptual modalities reinforce one another. In the end, we can trace the causal route it takes to produce them. Intuition offers no such apparatus. Its verdicts simply present themselves, with no organ at work and nothing we can point to that they make contact with. Consequently, we rely on them without a clear account of their nature or epistemic authority. But before we can understand intuitions themselves, we need to situate them within a broader epistemological landscape, one shaped by attempts to unify the justification of our basic beliefs.
We all have beliefs about the world, and we care whether they are true. We want to get things right. But we can’t step outside our own minds to check a belief against the world; the best we can do is to hold it for good reasons – for considerations that, from where we stand, speak in favour of its truth. That is what justification is.
Now suppose that beliefs could only ever be justified by other beliefs. Then, as the ancient Sceptics observed, no belief could ever be justified at all. Each belief would derive its support from further beliefs, which would themselves require further support, and so on without end. To foil this regress, we have three options: embrace an infinite chain (infinitism), allow the chain to loop back on itself (coherentism), or hold that some beliefs are justified independently of others (foundationalism). It is this final option, the view that there is a starting point or foundation for justification, that I will develop. But to do so, we must spend a little time explaining how a belief can be justified by something other than another belief.
If it visually seems to you that there is a tree, then you have a justification for believing that there is a tree
Perception is the simplest example. When I see a tree, my visual experience makes it seem as if there is a tree in front of me. I am presented with the tree. As the philosopher William Tolhurst once put it, perceptual seemings have ‘the feel of truth’, a sense of revealing how things really are (unlike mere thoughts, imaginings or desires, which lack this air of disclosure). But visual experiences are not themselves beliefs: I can have them without forming a belief, perhaps because I distrust my eyesight or suspect my drink has been spiked. Conversely, I can believe there is a tree without seeing it, perhaps because I am told there is one there. Nevertheless, the fact that my visual experience seems to reveal a tree to me is relevant to explaining why I come to believe there is one and why this belief is reasonable.
This is the set-up we need in order to stop the regress of reasons: a state – the visual experience – that is not a belief, but that can nevertheless justify my belief. One influential proposal, developed in different ways by Jim Pryor and Michael Huemer, is that when the world seems to us to be a certain way, we thereby have some justification for believing that it is that way – unless we have a reason to distrust it. More specifically, if it visually seems to you that there is a tree in front of you, then you simply have a justification for believing that there is a tree. The justification does not depend on possessing independent reasons to think that your perceptual system is functioning properly, or that you are not hallucinating, or that your environment is benign. The perceptual seeming itself carries justificatory weight. Of course, my justification can be defeated (for instance, by evidence that I have taken a hallucinogen). The point is simply that no further positive belief is needed for a perceptual seeming to rationally support the corresponding belief.
This provides the basic framework for solving the regress problem. Perceptual experiences are not themselves beliefs, yet they provide reasons for belief. And they do so without relying on antecedent justified beliefs and are not themselves in need of justification. Still, this leaves us with an important question: what is it about these experiences that allows them to justify belief in this way?
Perceptual experience in general, and visual experience in particular, have two familiar features. First, as we have seen, they seem to reveal the world to us, to present objects and properties as actually being out there in the world. Second, they have a vivid phenomenology, a distinctive what-it’s-likeness, as the philosopher Thomas Nagel put it. Many philosophers take these two features to be inseparable: perception seems to disclose reality because it feels the way it does. On this standard view, its phenomenology is presentational, and it is this presentational phenomenology that explains the epistemic force of perceptual experience.
It is at this point that intuitions re-enter the story. According to John Bengson’s concept of quasi-perceptualism, we should model the epistemic behaviour of intuitions on the epistemic behaviour of perceptual experiences: if perceptual seemings justify because they possess a presentational phenomenology, and if intuitions are to justify in the same basic way, then they must share that same kind of presentational phenomenology. When we have an intuition, it justifies a corresponding belief by virtue of exhibiting a felt quality analogous to the what-it’s-likeness of perception, a kind of intellectual seeming that presents its content as actual. For instance, think again of the stranger who gives you a seriously creepy vibe. Just as the tree visually seems green, so the stranger may simply seem untrustworthy. Something about him presents itself to you that way without you having worked out what exactly is making you uncomfortable.
On this view, the explanation for the epistemic force of intuition mirrors the explanation for the epistemic force of perception. Both states present certain facts as real (or present certain propositions as true) by virtue of a distinctive presentational phenomenology. Call this the phenomenal strategy. The difference between them lies simply in the character of this phenomenology. In perception, it is an empirical sensory experience of the external world; in intuition, it is an intellectual or conceptual experience that purportedly reveals the normative, modal or conceptual structure of the world. These are features of the world that we comprehend but can’t see – that gratuitous cruelty counts against taking an action (normative structure), that there could be no round square (modal structure), or that the lucky believer in fake-barn country still doesn’t really know (conceptual structure).
A state can feel exactly like perception while failing to present its contents as actual
But this phenomenological theory of the epistemic significance of intuitions faces a serious difficulty, one pressed most forcefully by Timothy Williamson and Ernest Sosa. Many reflective people report that they do not experience anything like the intellectual phenomenology that quasi-perceptualism posits. For them, judging that a proposition ‘seems right’ involves no distinctive experiential quality at all. If intuition lacks the requisite phenomenology in these cases, then the quasi-perceptualist explanation of its epistemic force collapses. (It’s worth evaluating this in yourself: do you feel an experiential quality when evaluating the thought experiments?)
This is the so-called absent intuition challenge. The kind of robust, presentational phenomenology developed on the basis of quasi-perceptualism is something many people simply deny having. Consequently, either these individuals lack introspective access to their own intuitions (an uncharitable conclusion), or the epistemic force of intuition cannot depend on the presence of a special intellectual phenomenology. If intuitions are to justify in the way quasi-perceptualism claims, then something other than phenomenology must be doing the epistemic work.
This conclusion can be pushed further to call into question even the epistemic significance of phenomenology for perception. To see why, consider the phenomenon known as derealisation disorder. Individuals with this condition report that their perceptual experiences feel perfectly normal from the inside – the colours, shapes and sensory qualities are all intact – yet the world does not seem real to them. Their experiences lack any sense of disclosure or revelatory force. In this respect, derealisation is the mirror image of a perfect hallucination. In derealisation, the experience gets things right, but it doesn’t feel like anything is being revealed; in hallucination, the experience gets things wrong, yet it feels totally convincing. The implication is striking. Call this apparent disclosure of reality presentationality: a mental state is presentational when its content is apprehended as how things actually are, rather than merely as they are thought about or imagined. Derealisation shows that neither the information carried by a perceptual state nor the way that state feels are sufficient for presentationality. A state can feel exactly like perception while failing to present its contents as actual. Phenomenology, then, cannot explain the epistemic force of perceptual seemings, let alone intuitions.
This suggests that defenders of quasi-perceptualism have been looking in the wrong place. Earlier, I noted that perceptual experience has two salient features: it has a rich phenomenology, and it seems to reveal the world to us. The phenomenal strategy seized on the first feature – understandably, given how vivid and conspicuous perceptual phenomenology is – and then treated it as the source of the second. But derealisation cases show that phenomenology can remain intact even when the experience loses its revelatory character. What matters for justification is not how we experience something, but how we apprehend it. On the view I defend, presentationality is a cognitive posture, a way of apprehending a content rather than a distinctive way the experience feels. And it is this posture, this way of grasping the world and not its phenomenological glow, that supplies perceptual experience with its epistemic force.
To see what this posture amounts to, it helps to contrast it with more widely discussed attitudes. Belief, for example, is assertive: it commits us to the truth of its content. Imagination, by contrast, is non-assertive: it entertains possibilities without treating them as actual. Presentational attitudes (that is, seemings) occupy a middle ground. This cognitive posture is what makes a seeming capable of justifying a belief: it presents reality without committing to it, offering us a direct but defeasible route to acceptance.
Once we understand presentationality in this way, the case of intuition falls naturally into place. A crucial feature of presentational states is that they are happenings, not actions. They occur in us; we do not perform them. So, when something intuitively seems true, we do not decide to have this intuition any more than we decide to see a tree. It arrives unbidden. This passivity is precisely what allows a seeming to present its content as actual. When an intuition strikes us, we are not making a judgment or forming a belief. We are apprehending the content as the way things are. The intuition presents the scenario as actual in a manner that calls for belief. In this respect, intuitive seemings share the same role as perceptual seemings.
Belief-formation is less like drawing a conclusion and more like yielding to a disclosure
Understood in this way, the absent-intuition challenge dissolves. The quasi-perceptualist assumed that intuition’s presentational force must arise from an intellectual phenomenology analogous to the sensory phenomenology of perception. But if presentationality is a cognitive posture rather than a phenomenological glow, then no special ‘intellectual experience’ is needed. A person may have no distinctive phenomenology when an intuition arises and yet still apprehend the content as actual in the relevant sense. And once a content is apprehended as actual, it is reasonable to form the corresponding belief. The quasi-perceptualist is right that intuition and perception share something fundamental, but wrong about what that shared feature is. It is not a proprietary phenomenology, but the nature of the apprehension itself.
Why should apprehending a content as actual have any epistemic significance? The answer, I think, is simple. Presentational states are the cognitive events that place us in contact with the world or, more precisely, that seem to place us in contact with the world. When something presents itself to us as being the case, our default cognitive response is to form the corresponding belief. When I turn the corner of a building and my eyes fall on a tree, the tree is simply there before me. Believing that there is a tree is not normally a conclusion I draw; rather I simply accept what my experience presents to me. This is not a matter of inference or deliberation; it is the natural way a rational mind responds to what it takes to be reality.
Belief-formation is less like drawing a conclusion and more like yielding to a disclosure. When the apprehension is accurate, this default response reliably produces true belief; when it is not, the response is still intelligible and reasonable. Presentational states are epistemically respectable because they are where the world shows up for us: the point at which reality makes its first claim on belief. Intuitions inherit this status. They are simply the presentational events through which we apprehend the conceptual structure of a situation as actual, and in doing so provide a rational basis for belief without the need for any further epistemic mechanism.
Intuition saturates our ordinary reasoning. Whenever we see what follows from something, notice that something counts in favour of some action, or recognise something as a possible course of action, we are relying on intuition. These moments rarely announce themselves. They do not arrive with phenomenological fanfare. They are woven into the background of our deliberation, operating quietly whenever we take in a situation and immediately apprehend its normative or conceptual contours.
In this sense, intuition is to cognition what perception is to our engagement with the physical world. Perception allows us to navigate our environment by revealing how things stand around us; intuition allows us to navigate the space of reasons, norms and possibilities by revealing how things stand within the conceptual landscape. When we deliberate, we constantly rely on intuitions to apprehend which considerations matter, how they bear on one another, and what follows from them. Intuition is the cognitive means by which the conceptual structure of a situation is revealed to us.
Seen in this light, the thought experiments with which we started no longer appear as philosophical curiosities. They are simply highly controlled instances of a capacity we rely on constantly. When we imagine a runaway trolley or a real barn surrounded by fakes, we are not invoking a mysterious faculty or peering into a metaphysical telescope. We are exercising the same basic capacity we use when we imagine telling a difficult truth to a friend or weigh up different possible courses of action. The only difference is that philosophical cases are crafted to isolate a specific conceptual relation. Their dramatic trappings obscure the fact that they depend on the same presentational attitude at work in more mundane reasoning.
Intuition does not compete with concept application. It enables it
This brings thought experiments back down to earth. Their epistemic significance arises not from exotic subject matter or imaginary scenarios, but from the fact that they trigger intuitions that disclose how certain concepts hang together. To see what it means for concepts to ‘hang together’, consider a familiar principle of storytelling: show, don’t tell. When J R R Tolkien in The Lord of the Rings (1954-55) describes the creature Gollum leading Frodo into the spider Shelob’s lair, he needn’t pause to explain: ‘This is an act of betrayal.’ The narrator doesn’t mark the moment when Gollum’s loyalties shift, or when his intentions cross a moral threshold. We grasp it directly from the unfolding of events. The situation presents itself as a betrayal: the actions, motives and dangers align in a way that demands the application of the concept. That is what I mean when I say that intuitions reveal how concepts hang together. They disclose the otherwise unstated conceptual requirements of a situation.
Now, a sceptic might argue that what is doing the work here is not intuition, but simply our skill at applying concepts. On this view, we respond correctly to cases because we are good at classifying situations. But this misses something crucial about the rationality of these classifications. To apply a concept is to act; it is to make a classificatory judgment. And judgments of this sort are not self-justifying. Simply deciding, without any basis, that a character has betrayed a friend would be epistemically arbitrary. Such judgments must themselves be grounded in something. Intuitions occur in us prior to and independently of any judgment. When a scenario strikes us as a clear instance of betrayal, that intuitive seeming is not itself an act of concept application. It is the pre-judgmental apprehension that makes the resulting judgment (the resulting application of the concept of betrayal) reasonable. In this sense, intuition does not compete with concept application. It enables it.
This same phenomenon of intuitive apprehension preceding judgment also shows up in ordinary perception. When we open our eyes, the world does not appear as a mosaic of colours and shapes. It appears as a scene populated with meaningful objects: a child reaching for a toy, a cat waiting expectantly for dinner, a car approaching too fast. As P F Strawson observed, if we try to describe what we see using only low-level sensory terms (patches of colour, shifting brightness), we falsify the experience. The world comes to us in perception already organised by concepts. What is presented is not bare visual data but things of certain kinds, situated in relations to one another.
And here, intuition enters even into everyday perceptual experience itself. Perception reveals not merely visual arrays but robust, three-dimensional situations that are concept-laden. This becomes particularly vivid in cases where expertise comes into play. Imagine walking through a field with a trained herpetologist. You both see a snake. Your sensory experience may be phenomenologically indistinguishable from hers – the same curves of the body, the same mottled pattern. Yet what is presented to each of you differs. To you, it is simply a snake. To her, it is an Agkistrodon contortrix. The difference is not in your visual apparatus per se but in the concepts at work within perception. Her grasp of the relevant distinctions generates a conceptually richer, even if phenomenologically identical, presentational state. And because intuitions are not phenomenologically robust, there is no need for any difference in how things look. This is why perceptual expertise can subtly transform experience without altering its sensory character.
Perception, then, is a perfect illustration of the broader point about intuitions. Because they lack any robust phenomenology, intuitions serve their function in plain view without our taking explicit notice of them.
The person who declines to get in the stranger’s car, or who flags the email as a phishing attempt, or who walks away from the deal – these individuals are not acting irrationally or on mere feeling. They are responding to a genuine presentational state: something is showing up as creepy, fraudulent or wrong. The situation is presenting itself as having a certain character, and that presentation carries epistemic weight – not because it is infallible, but because it is the same kind of state that grounds all of our most basic cognitive contact with the world.
This is precisely what philosophers mean when they talk about intuition. The difference between the person on the bridge who immediately senses that pushing the bystander is wrong, and the person who declines to get into a stranger’s car, is not a difference in kind. It is a difference in context and control. The philosopher’s thought experiment is a deliberately engineered situation designed to isolate and interrogate a single intuitive response. The everyday case is messier, embedded in a richer context, and rarely examined. But the underlying capacity, the presentational apprehension of how things are, is the same.
What has been missing in our theorising, until now, is simply the explicit recognition of this continuity. Philosophers have a well-developed account of why rational intuitions carry epistemic weight. They have been slower to claim that this account extends naturally to the intuitions we act on every day. Once we see this, ‘vibes’ and gut feelings are neither vindicated wholesale nor dismissed as mere noise. Instead, they are brought into the same framework that governs our most careful reasoning. The task of philosophy, then, is not to decide whether to trust intuition. It is to understand the role it already plays, from the thought experiment to the uneasy feeling about a stranger, in almost every act of understanding.