What Is Intersubjectivity?

Intersubjectivity is the shared understanding that emerges when two or more people connect through feeling, attention and intention. The word sounds academic and the thing it names is not. A parent and a baby trading expressions before either of them has said anything; two colleagues finishing each other's sentences; a friend who knows what you meant before you got to the end of the sentence — all of that is what the word is for.

This page is the broad answer to the broad question. It covers what intersubjectivity is in plain language, the developmental levels and what the popular phrase "the three types" gets wrong, what it looks like in a life, why it matters, how psychology and philosophy and education each put it to work, what happens to it through a screen or with a machine on the other end, and where the theory is genuinely weak.

Three companion pages go deeper in three different directions, and it is worth knowing which one you actually want. If you came for the word itself — the dictionary senses, the etymology, the discipline-by-discipline meanings — the definition of intersubjectivity page is the compact one. If you would rather recognise the thing than define it, the page of intersubjectivity examples is nothing but scenes. And if you want the philosophical lineage and the argument about whether separate minds can share anything at all, that is the intersubjectivity philosophy page. This one stays broad on purpose.

Intersubjectivity in Simple Words

Intersubjectivity is the shared understanding between two or more people that makes communication possible rather than merely audible. Feelings, attention and intentions line up well enough that the people involved enter a space that is neither purely private nor purely external. It is shared, and it is made rather than found.

The word earns its place because neither of the two words we already had would do. Subjective experience is what happens inside one person: a private thought, an unspoken feeling, a sensation nobody else can reach. An objective fact holds whether or not anyone is looking; water boils at the same temperature regardless of your opinion about it. Intersubjectivity sits between those two and is not reducible to either. It is shared, but it is not fixed the way a physical fact is fixed, because it exists only because people are making it together.

The clearest analogy is two musicians improvising. Neither of them holds a complete score. Each is responding to the other's phrasing, tempo and emotional weight, and the music that comes out belongs to neither player on their own. It exists between them, and it stops existing when one of them stops playing. That is also why intersubjectivity runs on a spectrum rather than being on or off — from a two-second flicker of shared attention to years of sustained attunement between people who know each other well.

One thing worth saying early, because a lot of writing on this subject blurs it: no single settled definition of intersubjectivity exists. The social psychologists Alex Gillespie and Flora Cornish assembled seven distinct scholarly definitions in a 2010 paper, and their point was that the seven do not collapse into one. So what follows describes a family of closely related ideas rather than one crisply bounded technical term, and any page that hands you a single official version is handing you a preference.

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The Three Types of Intersubjectivity — and What That Phrase Gets Wrong

"The three types of intersubjectivity" is one of the most searched phrases on this subject and it is slightly wrong in two ways at once. It is worth untangling, because the untangling is most of the understanding.

The first problem is that they are not types. Primary, secondary and tertiary intersubjectivity describe a developmental sequence — how the capacity grows in a child over the first years of life — not three varieties of the thing that a person could pick between. They answer "how does this develop?" A second, different list — shared emotion, shared attention, shared intention — answers "what is this made of?" Those three are ingredients present in any single intersubjective moment, at any age. Confusing the sequence with the ingredients is the single most common error in popular accounts of this subject, and once you separate them the literature stops looking contradictory.

The second problem is attribution. The three levels are routinely credited to Colwyn Trevarthen alone, and that is not quite right either. Primary intersubjectivity is Trevarthen's, from his work on face-to-face exchange between infants and caregivers. Secondary intersubjectivity comes from his 1978 chapter with Penelope Hubley. Tertiary intersubjectivity comes later still, out of his long collaboration with the Norwegian social scientist Stein Bråten. Three names, three moments, one sequence assembled over decades — not a single scheme handed down whole.

Primary intersubjectivity is direct, face-to-face emotional exchange between an infant and a caregiver, with no external object involved. The two of them trade expressions, sounds and rhythms, and the interaction itself is the entire content. Trevarthen's films of eight-week-old infants "conversing" with their mothers are the best-known demonstration of it. Later work places the capacity at roughly two to three months, with the eight-week mark cited as the point where infants begin taking turns in these wordless exchanges.

Secondary intersubjectivity adds a third element around the ninth month. The relation shifts from person-to-person to person-person-object: an infant and a caregiver jointly attending to something in the world while each stays aware of the other's attending. A parent and a toddler pushing the same toy car are doing this. The shared focus now includes the object, which is what makes pointing, showing and checking a face possible at all. Trevarthen and Hubley described it as resting on a cooperative exchange of referential gestures, which is a precise way of saying the baby has started using you to mean something about the world.

Tertiary intersubjectivity is collaborative awareness carried by symbol and narrative. Older children and adults reflect on shared experience, tell each other stories about it, argue about what it meant and build common frameworks out of the argument. This is the level that carries culture, schooling and any social coordination complicated enough to need words — and it is the level you are operating at right now, reading someone else's account of a concept and deciding what you make of it.

So: not three types, and not one author. A developmental sequence with a contested and slowly assembled lineage, sitting alongside a separate three-part account of what any intersubjective moment contains. The field has never settled on a fixed taxonomy of intersubjectivity, and the developmental sequence is the closest thing to an established framework it has.

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Where the Idea Came From

Intersubjective notions were circulating in psychology by the early 1900s. George Stout's 1903 textbook The Groundwork of Psychology is commonly cited as an early sighting, though no source establishes a firm coinage date for the term itself and different accounts place its arrival in the social sciences decades apart. An early sighting is not a starting gun, and it is worth resisting the tidier story.

Edmund Husserl is where the concept acquired weight. In the fifth of his Cartesian Meditations, out of Sorbonne lectures given in February 1929, he asked how we experience other people as minds rather than as objects that happen to move — and made that question central to phenomenology rather than peripheral to it. Jacques Lacan carried the concept into psychoanalysis in the 1950s. Jürgen Habermas took it up in 1970, in an essay in the journal Inquiry, arguing against Noam Chomsky that a grammar-centred account of how children acquire language is monological and misses the point: children learn to speak by participating in shared practice, which makes shared understanding the precondition for language rather than its byproduct. Colwyn Trevarthen brought it into developmental psychology in the 1970s with the infant films described above.

That is the compressed version, and compressed is the right amount here. The full lineage — what Husserl was actually arguing against, why Lacan's four-cornered diagram makes a transparent meeting of minds impossible, what Habermas thought was at stake — is laid out properly on our intersubjectivity philosophy page, and the origins of the word itself are handled on the definition page.

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What It Looks Like in Ordinary Life

A mother mirrors her baby's smile and coos; the baby answers with a sound; the exchange keeps going, each turn built out of the last one. No object, no words, nothing in the frame but the two of them. That is primary intersubjectivity happening in a kitchen.

Two children build a block tower. One steadies the base while the other places the next block, each anticipating what the other is about to do. They share attention on the tower and share the intention to make it taller. That is the secondary level, and it is also just a Tuesday afternoon.

Two friends talk about a film they both saw. One says the ending felt bittersweet. The other says, that is exactly what I felt and could not name. Something passes between them that neither had before the sentence, and it is not information — it is a shared reading of an experience that now belongs to both of them.

A therapist notices a client hesitate, reflects the hesitation back, and slows down. The client feels met. A design team sketches an idea and someone else immediately sees why it works, because the team has been building a common frame for months without ever writing it down.

These are illustrations rather than a catalogue. Recognising the pattern in your own week is a different job from defining it, and we keep a full page of intersubjectivity examples — including the ones where it fails, which are more instructive — for readers who want that job done properly.

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Why Is Intersubjectivity Important?

The first answer is developmental. Attuned early interaction is one of the conditions under which secure attachment forms. When a caregiver responds consistently and accurately to a child's signals, the child is learning something more general than the content of any exchange — that inner states are the kind of thing that can be shared, and that expressing one tends to produce a response. That lesson, or its absence, travels a long way.

The second is linguistic. Children do not absorb language passively from exposure. They acquire it inside exchanges where meaning is already being negotiated, which is precisely what Habermas was arguing against Chomsky. Words get their meaning from being used between people. The pointing toddler of the secondary level is doing the groundwork for every sentence they will ever say.

The third is social, and it is the least surprising. Shared understanding is what empathy, cooperation and trust are built out of. Without it, social life would be a series of individually reasonable actions that never add up to anything — a set of monologues delivered in the same room.

The fourth is clinical, and it is where the research has moved most recently. A 2023 editorial in Frontiers in Psychology gathering current work on intersubjectivity ranges across loneliness, very premature birth, parenting stress and autism spectrum conditions — which is to say the concept has become a lens through which specific clinical questions are being asked, rather than a purely theoretical commitment. Therapeutic approaches built directly on it exist too. Dyadic Developmental Psychotherapy, developed by the clinical psychologist Dan Hughes for adopted and fostered children who experienced developmental trauma, works from an attitude summarised as PACE: Playfulness, Acceptance, Curiosity and Empathy. The order is worth getting right, since it circulates in several scrambled versions.

A caution belongs with all four. Deficits in shared understanding is a phrase that slides very easily from describing a pattern to indicting a childhood, and the evidence does not support the second thing. What the developmental literature establishes are associations, measured through specific coded constructs, in populations. It is a real signal and it is not a verdict on anyone in particular.

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How Psychology, Philosophy and Education Actually Use It

The three fields do not merely define the word differently. They put it to work on different problems, and the difference in the work is more informative than the difference in the definitions.

In psychology and psychotherapy, intersubjectivity is mostly used to relocate where change happens. Attachment theory treats the quality of early attunement as shaping how a person relates for decades afterward. Psychoanalysis went further: George Atwood and Robert Stolorow's Structures of Subjectivity, first published in 1984, was the first systematic presentation of the intersubjective viewpoint inside psychoanalysis, treating the analytic situation as a meeting of two organised subjective worlds rather than one expert examining one patient. Jessica Benjamin's The Bonds of Love, in 1988, brought a feminist reading of mutual recognition into the same conversation. The practical consequence in all of it is the same: the relationship stops being the setting in which the technique is applied and becomes part of what is doing the work.

In philosophy, the concept is doing something much harder and much less applied. It is asked to answer how separate conscious minds can establish anything in common at all — a question about conditions rather than about behaviour. Nothing in the psychological use of the term settles it, and nothing in the philosophical use tells a clinician what to do on Tuesday. Both are legitimate uses of one word, which is part of why seven definitions exist.

In education, intersubjectivity names the shared focus a teacher and a learner have to establish before anything can be taught. Barbara Rogoff's account of guided participation makes it the thing the whole arrangement rests on: adult and child must be attending to the same task, each aware of the other's attention, before the adult can build a bridge from where the child is to where the learning goes. That reframes what a lesson is. A student's puzzled face changes the teacher's next sentence, and the teacher's next question opens something in the student, and the learning happens in the traffic between them rather than crossing a gap in one direction.

It is worth being clear about what it is not, in a classroom. Intersubjectivity is not an instructional method with steps. It is a way of seeing what is happening in the relationship a lesson runs through, which is exactly why it travels so easily into education from two other fields and never quite becomes a technique.

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Intersubjectivity in the Digital Age: Screens, and Then Machines

Start with the easier question, which is screens between two humans. Online communication thins the channel. It removes tone, it delays the response, and it complicates the joint attention the secondary level depends on — you can no longer simply look at what the other person is looking at. A video call keeps some of the signal and loses the rest; text strips away nearly all of it.

And yet people plainly build real relationships this way, which tells you something. The reasonable reading is that intersubjectivity adapts to a thin channel rather than requiring a thick one. Participants do more explicit work to supply what the medium removed — spelling out tone, sending the emoji that stands in for a facial expression, asking directly whether that landed the way it was meant. The shared field is still built; it just costs more to build and it collapses more easily, which is why a message meant as brief so often reads as cold.

The harder question is a participant who is not a person. Affective computing — the field Rosalind Picard named in her 1997 book of that title — builds systems that recognise emotional cues and respond in ways calibrated to them. People using such systems frequently report feeling understood. That report is real and worth taking seriously as a fact about the person having the experience. What it does not settle is whether anything was understood on the other side, and those are genuinely two different questions.

There is a philosophically precise version of the problem, and it does not go our way. On Husserl's account, intersubjectivity requires encountering another as a subject with a first-person perspective of its own, not merely something behaving in familiar ways. No current system can be shown to supply that. A reader who concludes that machine interaction therefore is not intersubjectivity in the strict sense is reasoning correctly, and the argument is set out at length on our intersubjectivity philosophy page rather than glossed here.

Since this page belongs to an AI coaching system, a reader is owed a plain statement of where that leaves us. IX Coach is designed to do the externalising half of reflection: taking what you said, holding it still, tracking it across a conversation you would otherwise remember selectively, and handing back a pattern you had not named. Those are real functions. What we do not claim is that a second consciousness is meeting yours — we cannot demonstrate it, and a system built to support accurate perception of other minds would be undermining its own purpose by fudging that particular point.

The genuinely open question is not whether machines can be intersubjective in the human sense. It is what happens to human intersubjectivity when a large share of reflective conversation starts happening with something that is not a person. Nobody knows yet, the question applies to us as much as to anyone building in this space, and it is more useful standing open than resolved in our favour.

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Common Critiques and Limitations

The most basic critique is that intersubjectivity is not one settled concept. The seven definitions Gillespie and Cornish catalogued are the clearest evidence: different disciplines use the term for different work, and a reader moving between them can easily think they are following one argument when they are following three. That fragmentation is a real cost, whatever else the concept is worth.

The infant evidence has been questioned too. Films of eight-week-olds trading expressions with their mothers are the founding demonstration, and the reasonable objection is that adults reading intention into infant behaviour are extremely well equipped to see intention that is not there. The finding has held up well across five decades. It is still worth stating at its actual strength: films of infants suggest rather than prove, and the strong version of the claim — that newborns arrive with a full intentional sociality — outruns what a film can settle.

There is a cross-cultural limitation that matters more than it usually gets credit for. Most of the research grew out of Western, individualistic settings, and it went looking for face-to-face verbal exchange because that is what the researchers' own world was made of. Barbara Rogoff's work on Learning by Observing and Pitching In describes children in Indigenous and Indigenous-heritage communities of the Americas learning primarily through keen observation of and participation in ongoing community activity. The attunement there is real; it simply does not look like the thing the standard paradigm was built to detect. Communication styles vary the same way — the difference between spelling meaning out and leaning on shared history and silence is enough to make a considered pause read as resistance to someone trained on the other pattern.

Measurement is the hardest limitation and the least resolved. Two-brain recording during interaction has become a serious research programme and does find that people's neural activity coordinates during cooperative and emotionally engaged exchange. What that coordination means is open. Whether it constitutes shared experience, accompanies it, or simply reflects two people doing similar things at the same time is not something the imaging can currently distinguish, and any account that tells you the matter is settled has run ahead of the evidence.

A final and more personal limitation. People systematically overestimate how well they understand the people closest to them — the closeness of the relationship gets mistaken for accuracy about what the other person means, and the checking stops precisely where the confidence rises. That is not an argument against the concept. It is a reminder that the feeling of having connected is not evidence that connection occurred, which is the failure mode this whole subject is most useful for catching.

Even the sharpest critics tend to agree the concept picks out something real. The argument is about how to define it and whether it can be measured, not about whether the phenomenon exists.

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Frequently Asked Questions About Intersubjectivity

What is intersubjectivity in simple words? It is shared understanding between two or more people — the state you are in when minds meet through emotion, attention and intention rather than merely exchanging sentences.

What are the three types of intersubjectivity? Strictly, there are not three types. There is a developmental sequence — primary, face-to-face emotional exchange with nothing else in the frame; secondary, shared attention on an object or activity from around the ninth month; tertiary, collaborative meaning-making through symbol and narrative. Separately, there is a three-part account of what any intersubjective moment contains: shared emotion, shared attention, shared intention. The sequence describes how the capacity develops; the components describe what it is made of.

Can you give me an example of intersubjectivity? A parent and infant taking turns in a wordless cooing conversation. Or two friends discovering they both felt the same unnamed thing about a film, and the discovery changing what the film meant to each of them.

Why is intersubjectivity important? It underpins secure attachment, language acquisition, empathy, cooperation and trust, and its absence is implicated in a range of clinical questions from loneliness to the developmental consequences of very premature birth.

What is the difference between intersubjectivity and empathy? Empathy is feeling with another person and it can run one way — you can be deeply empathic toward someone who never learns it, and nothing intersubjective has happened. Intersubjectivity is reciprocal by definition: your response changes their expression, which changes your next response. Empathy is better understood as something that can operate inside an intersubjective exchange than as a rival to it.

Is intersubjectivity innate or learned? Both, on the current reading. The evidence points to an innate readiness, visible in infants at roughly two to three months, whose full expression depends on the social experience that follows. A capacity present at the start is not the same as a capacity that develops on its own.

The Short Answer

Intersubjectivity is the shared understanding that makes human connection possible — the space between minds where meaning gets made rather than transmitted. It is neither private like a thought nor fixed like a fact, and it exists only while people are making it.

What is often called the three types is really a developmental sequence, assembled over decades by Trevarthen with Hubley and later with Bråten, describing how the capacity grows from face-to-face exchange to shared attention on the world to collaborative meaning-making in words. The three components — shared emotion, shared attention, shared intention — are a different list answering a different question.

It matters because attachment, language, cooperation and a good deal of mental health run through it, and because its absence is felt rather than merely observed. It is contested because it is built out of subjective material, which is reported rather than measured, and no concept assembled that way will ever admit only one honest description of itself.

The practical version is smaller than any of that. The moments in your week when you felt genuinely met were instances of it, and the moments you did not were instances of its absence, and the difference between the two is usually whether anyone checked.

Frequently asked questions

Research

• Theano Kokkinaki, Jonathan Delafield-Butt, Emese Nagy & Colwyn Trevarthen, (2023), Editorial: Intersubjectivity: recent advances in theory, research, and practice, Frontiers in Psychology, 14:1220161 — The introduction to a collection of current intersubjectivity research. It is cited here for the clinical range described on this page — loneliness, very premature birth, parenting stress and autism spectrum conditions are among the topics the collection covers. verified 2026-10-08
• Colwyn Trevarthen & Penelope Hubley, (1978), Secondary intersubjectivity: Confidence, confiding and acts of meaning in the first year, In A. Lock (ed.), Action, Gesture and Symbol: The Emergence of Language, pp. 183-229. Academic Press — The chapter that named secondary intersubjectivity and placed it toward the end of the first year, as a three-way relation between infant, caregiver and an object they jointly attend to. This is the source for attributing the secondary level to Trevarthen with Hubley rather than to Trevarthen alone. A book chapter with no stable URL to verify a passage against, so it carries no verifiedOn date.
• Stein Braten (editor), with Colwyn Trevarthen, (2007), On Being Moved: From Mirror Neurons to Empathy, Advances in Consciousness Research 68, John Benjamins — Where the tertiary level and the idea of other-centred participation are developed, in the long collaboration between Braten and Trevarthen. Popular summaries commonly credit all three levels to Trevarthen alone, which is the misattribution this page corrects. verified 2026-09-13
• Alex Gillespie & Flora Cornish, (2010), Intersubjectivity: Towards a Dialogical Analysis, Journal for the Theory of Social Behaviour, 40(1), 19-46 — The paper credited with assembling seven distinct definitions of intersubjectivity. It treats the term as covering a range of possible relations between perspectives, which is why this page presents no taxonomy as official.
• George Frederick Stout, (1903), The Groundwork of Psychology, Hinds & Noble, New York — Commonly cited as an early instance of intersubjective notions in psychology. The book and its date are confirmed; no source establishes a precise coinage date for the term itself, which is why this page claims an early sighting rather than an origin. verified 2026-10-08
• Jurgen Habermas, (1970), Towards a theory of communicative competence, Inquiry, 13(1-4) — The essay in which Habermas questions whether Chomsky's account of linguistic competence can support a theory of communication, on the grounds that it is monological. It is the basis for this page's claim that language acquisition depends on shared understanding.
• George E. Atwood & Robert D. Stolorow, (1984), Structures of Subjectivity: Explorations in Psychoanalytic Phenomenology, The Analytic Press — Described by its publisher and by later retrospectives as the first systematic presentation of the intersubjective viewpoint in psychoanalysis. Cited here for the claim that psychoanalysis came to treat the analytic situation as a meeting of two organised subjective worlds. verified 2026-10-08
• Jessica Benjamin, (1988), The Bonds of Love: Psychoanalysis, Feminism, and the Problem of Domination, Pantheon Books — The book that brought a feminist intersubjective perspective, centred on mutual recognition between two subjects, into psychoanalytic theory. verified 2026-10-08
• DDP Network / Dan Hughes, What is meant by PACE?, DDP Network — Source for the correct expansion and ordering of PACE - Playfulness, Acceptance, Curiosity, Empathy - and for Dan Hughes' authorship of Dyadic Developmental Psychotherapy. Scrambled orderings of the four are common elsewhere. verified 2026-10-08
• Barbara Rogoff, (2014), Learning by Observing and Pitching In to Family and Community Endeavors: An Orientation, Human Development, 57(2-3), 69-81 — The framework behind this page's cross-cultural caution. Rogoff's own qualifier matters and is carried into the prose: the pattern may occur in all communities and is described as especially prevalent in Indigenous and Indigenous-heritage communities of the Americas, which makes it a tendency rather than a rule about a people.
• Rosalind W. Picard, (1997), Affective Computing, MIT Press — The book that named and defined affective computing as the effort to give machines the ability to recognise, interpret and express emotion. Cited here for the description of systems that respond to emotional cues, not as evidence that such systems understand anything. verified 2026-10-08
• Ana Rita Pereira, Joana Coutinho et al., (2024), Interpersonal neural synchronization during social interactions in close relationships: A systematic review and meta-analysis of fNIRS hyperscanning studies, Neuroscience & Biobehavioral Reviews — Representative of the two-brain recording literature this page describes. It supports that neural coordination is observed during social interaction; it does not establish that the coordination constitutes shared experience, which is why the measurement question is presented here as open.