Theory of Mind: What Is It and Why Is It Crucial for the Child?
Understanding how children learn to read the thoughts and emotions of others — and why this ability is at the heart of social, emotional, and academic development
Why does a 3-year-old not understand that a friend might look for a toy where he hid it, and not where the friend last saw it? Why is a 5-year-old suddenly able to lie convincingly, make surprises, or understand jokes and double meanings? The answer to these questions lies in three words: theory of mind. This fundamental cognitive ability — understanding that others have thoughts, beliefs, desires, and emotions different from our own — is one of the most remarkable achievements of human development. It underpins social skills, empathy, communication, and even academic success. This guide explains what theory of mind is, how it develops in children, what can disrupt its development, and how to support it in daily life.
What Is Theory of Mind? Definition
Theory of mind (in English Theory of Mind, often abbreviated ToM) refers to the ability to attribute mental states — thoughts, beliefs, intentions, desires, emotions — to oneself and others, and to understand that these mental states influence behaviors. In other words, it is the ability to understand that others have an "inner world" that may differ from our own and from the real world.
The term was introduced by primatologists David Premack and Guy Woodruff in 1978, in a foundational paper questioning whether chimpanzees possess a theory of mind. Since then, this concept has become one of the most studied in developmental psychology and social neuroscience.
« The theory of mind is the ability to put ourselves in someone else's shoes, to understand their beliefs and desires even when they differ from our own. It is the foundation of all human social life. »
The “false belief”: the fundamental test
The most classic proof of the acquisition of the theory of mind is the false belief test, designed by psychologists Wimmer and Perner in 1983 and has become the reference paradigm in this field. In its most well-known version — the Sally and Anne test — the child observes the following scene: Sally puts a marble in her basket, then leaves the room. In her absence, Anne moves the marble into a box. The child is then asked: “Where will Sally look for her marble when she comes back?”
The correct answer is: in the basket — where Sally put it, where she thinks it still is. 3-year-old children generally answer “in the box” — where the marble actually is. They do not yet distinguish between their own knowledge and Sally's. 4-5 year old children answer correctly — they understand that Sally has a false belief, different from reality, and that her behavior will be guided by this belief, not by reality.
The development of theory of mind in children
The theory of mind is not acquired in a day. It develops gradually over the first years of life, following a relatively universal sequence that researchers have extensively documented.
Predecessors from the first year
Long before reaching 4 or 5 years old, babies exhibit behaviors that reflect the beginnings of social understanding. As early as 9 to 12 months, joint attention appears: the child begins to point at objects to share their interest with the adult and to follow the adult's gaze. This behavior already implies a primitive form of awareness that the other has a viewpoint, an intention, an attention directed towards something.
From 14-18 months, intentional imitation manifests: children imitate the intentional gestures of an adult (what they intended to do), and not just their accidental gestures — showing that they already distinguish the intentional from the accidental. Around 18 months, symbolic play (pretending a banana is a phone) emerges, demonstrating an ability to represent "what is not there."
From 2 to 4 years: understanding desires and emotions
Around 2-3 years, children understand that desires can differ from one person to another: they accept that an adult may want broccoli while they prefer cookies, and that the adult will be happy if given broccoli even if they would not be. They also understand that desires influence emotions: if one wants something and gets it, one is happy; otherwise, one is sad or angry.
At 3-4 years, they begin to understand true beliefs — that a person thinks something because they have seen or heard something specific. But false beliefs — that a person can believe something that does not correspond to reality — remain out of reach.
4-5 years: acquisition of first-order false belief
The acquisition of complete theory of mind — the ability to understand false beliefs — generally occurs between 4 and 5 years in typically developing children. It is a true cognitive revolution: the child can now mentally simulate another person's state of mind, different from their own and different from reality. This acquisition opens the door to fundamental social and cognitive abilities: lying (understanding that one can make someone believe something false), strategic deception, understanding irony and double meanings, surprises, secrets.
Understanding the first-order false belief
At around 4-5 years old, the child understands that Marie thinks the cat is in the garden (even though it is actually in the house) because Marie does not know that the cat has moved. He can correctly answer "Where will Marie go to look for the cat?" — in the garden, where Marie believes it is, not where it actually is.
6-12 years: second-order theory of mind and advanced social cognition
Between the ages of 6 and 8, children acquire second-order theory of mind: they can reason about what one person thinks about what another thinks ("Marie thinks Paul believes..."). This ability is essential for understanding complex social situations: rivalries, alliances, misunderstandings, manipulation, social strategy.
Throughout childhood and adolescence, theory of mind continues to become more sophisticated: understanding metaphors and sarcasm, detecting lies by omission, reading complex and ambiguous emotions (embarrassment, jealousy, indirect pride), understanding implicit social norms. These advanced levels of social cognition continue to develop into adulthood.
The brain bases of theory of mind
Theory of mind relies on a specific neural network, sometimes called the mentalization network or "theory of mind" network. This network primarily includes: the right temporo-parietal junction (involved in the distinction between self and others and in understanding false beliefs); the medial prefrontal cortex (representation of others' mental states); the superior temporal sulcus (processing biological movements and intentions); and the amygdala (processing social emotions).
Mirror neurons and empathy
The discovery of mirror neurons in the 1990s sparked considerable enthusiasm for understanding the bases of empathy and social cognition. These neurons, activated both when performing an action and when observing someone else perform it, are involved in the mental simulation of others' actions and emotions. Although the exact role of mirror neurons in theory of mind remains scientifically debated, it is established that mental simulation — "putting oneself in someone else's shoes" — is a central mechanism of human social cognition.
Theory of mind and autism: a central link
Research on theory of mind has been profoundly influenced by the study of autism — and vice versa. Psychologist Uta Frith and her colleagues Simon Baron-Cohen and Alan Leslie proposed in 1985 that the characteristic social difficulties of autism could be explained by a specific deficit in theory of mind — which they called "mental blindness" (mindblindness).
The profile of autistic individuals regarding theory of mind
Autistic children generally fail false belief tests at ages when non-autistic children succeed — even when their overall intellectual level is normal. However, the understanding of theory of mind in autism is more nuanced than the simple initial "deficit": many autistic individuals eventually acquire theory of mind, but through different cognitive pathways (more analytical, less intuitive) and often later. Difficulties are more pronounced in spontaneous real-life social situations than in standardized tests.
⚠️ A delay in theory of mind can be a signal
If a 5-6 year old child consistently fails simple false belief tasks, shows marked difficulties in understanding the emotions and intentions of others, or has significant difficulties in social relationships with peers, an evaluation by a specialized professional (neuropsychologist, child psychiatrist) is recommended. These difficulties may be associated with autism spectrum disorder, other developmental disorders, or other factors for which early identification allows for appropriate management.
Theory of mind and other neurodevelopmental disorders
The difficulties in theory of mind are not exclusive to autism. Specific profiles have been identified in other neurodevelopmental disorders. In ADHD, social cognition difficulties exist, particularly in attributing emotional states and understanding complex social intentions — likely related to deficits in executive functions that support mental simulation. In language disorders, the development of theory of mind may be delayed, as language plays a crucial role in acquiring understanding of mental states. In deafness, deaf children of hearing parents (with less access to emotional and mental conversations) frequently show a delay in theory of mind.
The importance of theory of mind in child development
Theory of mind is not an abstract developmental curiosity. It decisively conditions many aspects of child development.
Social relationships
Understanding the intentions and emotions of peers is essential for cooperating, negotiating, resolving conflicts, and forming genuine friendships.
Academic success
Theory of mind is linked to reading comprehension (inferring the intentions of characters), communication with teachers, and collaborative learning.
Effective communication
Adapting one's speech to the interlocutor, understanding implications, irony, humor — all communicative skills depend on theory of mind.
Empathy and emotional regulation
Theory of mind is the cognitive basis of empathy: without understanding that others can suffer or rejoice, one cannot truly feel with them.
Theory of mind and reading comprehension
A strong link has been documented between the level of theory of mind and narrative text comprehension skills. Understanding a story involves inferring the intentions, motivations, and beliefs of the characters — a task directly dependent on theory of mind. Children with good mentalization abilities better understand the nuances of stories, ellipses, plot twists, and character motivations. This relationship is observed independently of decoding skills (word reading).
How to support the development of theory of mind?
Research identifies several environmental factors that promote the development of theory of mind — and activities that parents, teachers, and professionals can implement to support it.
Emotional and mental conversation
One of the strongest predictors of early theory of mind development is the frequency of conversations about mental states within the family. Parents who regularly talk about emotions, thoughts, intentions, and beliefs — “Do you think grandma is sad because...?”; “Why do you think your friend did that?”; “How would you feel if...?” — accelerate the acquisition of theory of mind in their children. This practice, called “mental state talk” by researchers, is one of the most natural and effective interventions.
💬 Example of conversations promoting theory of mind
After a conflict with a peer: “Why do you think Luca got angry? What do you think he must have thought when you took his toy?”
While reading a book: “Why does the wolf want to trick the little pigs? How do you think the little pig feels right now?”
In response to an emotion: “You looked sad earlier. Can you tell me what was going on in your head?”
In response to a social misunderstanding: “Why do you think the teacher said that? What do you think she wanted you to understand?”
Reading and narrative stories
Shared reading of books rich in the mental states of characters is a particularly valuable developmental activity. Books that explicitly show the thoughts and emotions of characters, stories with misunderstandings or deceptions, and multiple perspective stories (the same event told by different characters) directly stimulate the capacity for mentalization. Guided reading — where the adult pauses to question the emotions or intentions of the characters — amplifies these benefits.
Symbolic and role play
Role-playing and pretend play is a natural trainer of theory of mind. By playing “pretend” to be a character different from themselves, the child practices adopting a perspective different from their own. By acting out social scenarios (playing shopkeeper, pirates, doctor), they stage and anticipate the mental states and behaviors of different roles. Studies show a strong positive correlation between the level of symbolic play at around 3 years old and theory of mind performance at 5 years old.
🌈 COCO — Cognitive stimulation for children aged 5-10
Developed by DYNSEO, COCO is a cognitive games application specifically designed for children aged 5 to 10. Its activities stimulate attention, memory, language, and reasoning in a playful, colorful, and safe environment. For children whose social cognition development requires specific support, COCO offers a stimulating foundation that supports the fundamental cognitive acquisitions on which theory of mind relies.
Discover COCOSupporting theory of mind in autism
For autistic children, explicit teaching programs for theory of mind have been developed and validated. These programs, such as Carol Gray's approaches (Social Stories) or emotion recognition training programs, explicitly and structurally teach the social rules and mental states that non-autistic children acquire implicitly.
😊 Facial Expression Decoder & Emotion Thermometer
DYNSEO has developed two practical tools particularly useful for supporting social and emotional cognition: the Facial Expression Decoder, which helps children identify and name emotions from facial expressions — a fundamental skill for theory of mind — and the Emotion Thermometer, a visual tool that allows expressing and grading the intensity of felt emotions. These tools are particularly valuable for children with autism, children with emotional difficulties, or simply for any child learning to identify and communicate their emotions. Discover all our support tools.
Augmentative and Alternative Communication
For non-verbal children or those with significant communication difficulties — often those whose theory of mind is the most fragile — augmentative and alternative communication (AAC) tools can open pathways for expressing and sharing mental states that would otherwise be inaccessible.
🗣️ MY DICTIONARY — Communication for Non-Verbal Children
MY DICTIONARY is a DYNSEO application specifically designed to promote communication in non-verbal individuals or those with expression difficulties, particularly autistic children. By facilitating the expression of needs, desires, and emotions, MY DICTIONARY helps build the bridges of intersubjective communication upon which social cognition development can rely.
Discover MY DICTIONARYTheory of Mind and Pedagogy: What Teachers Can Do
Teachers have a crucial role to play in the development of theory of mind, especially in preschool and elementary school. Several pedagogical practices are particularly effective.
Explicit Teaching of Social Cognition
Structured school programs for education on emotions and social skills — such as social and emotional learning (SEL) programs — have shown significant effects on theory of mind skills, peer relationships, and even academic performance. Dedicating explicit time to talk about emotions, analyze social situations, and practice perspective-taking is not wasted time: it is time invested in cross-cutting skills with lasting effects.
🎓 DYNSEO Training on Neurodevelopmental Disorders
Education and health professionals wishing to better understand and support social cognition difficulties can benefit from DYNSEO training on autism spectrum disorders and neurodevelopmental disorders. These Qualiopi certified trainings provide concrete tools to identify difficulties in theory of mind, adapt pedagogical and therapeutic practices, and effectively support the concerned children in their social and cognitive development.
Theory of Mind in Adulthood and Aging
Theory of mind continues to develop and become more sophisticated beyond childhood. In adults, it reaches its highest levels: understanding hidden intentions, double meanings, complex and mixed emotions, cultural implications, and subtle irony. It plays a role in the quality of interpersonal relationships, professional performance in relational jobs, and leadership skills.
With age, certain aspects of social cognition decline — particularly the recognition of emotions from facial expressions and the understanding of irony. These changes are related to modifications in the processing of social information in the aging brain. Therefore, stimulating social activities and rich interpersonal exchanges is also a factor in preserving theory of mind in aging.
Conclusion: Theory of Mind at the Heart of Our Social Humanity
Theory of mind is much more than a developmental stage checked off on the list of a child's cognitive acquisitions. It is the skill that allows us to live together, understand each other, cooperate, and care for one another. It is at the heart of empathy, communication, friendship, love, and even morality — all these abilities that define what we might call our "social intelligence."
Understanding how it develops — and how to support this development in children who need it — is one of the most valuable contributions that developmental psychology has made to education and therapy. Whether you are a parent, teacher, health professional, or simply curious to understand what makes humans so remarkably social, theory of mind is an invaluable key to understanding.
To go further in supporting socio-emotional development, explore our tools Facial Expression Decoder and Emotion Thermometer, our applications COCO and MY DICTIONARY, and our specialized training.