I was a child who read everywhere. Under the covers with a torch when I was supposed to be asleep. At the dinner table until someone took the book away. In the back seat of the car on long drives, sick as a dog from the motion but unable to stop. I do not remember learning to read. I only remember that at some point there was this other world available inside books, and once I found it I wanted to be there more than I wanted to be wherever I actually was.

I did not think of this at the time as anything other than a preference, the way some kids wanted to be outside and I mostly wanted to be somewhere in the 1800s or a spaceship or inside another person’s life. But I have been thinking about it differently lately. Not as a reading habit. As the place where my interior life was actually constructed. As the environment in which I learned how to be a person who could think and feel in ways that went deeper than whatever the immediate situation required.

Psychology has been making sense of this for decades. And what it says is more interesting than the usual praise heaped on reading as a learning tool.

What fiction does to the brain that nothing else quite replicates

Raymond Mar and Keith Oatley have produced some of the most important research on what reading fiction actually does to us. In a foundational paper published in Perspectives on Psychological Science, they proposed that fiction functions as a simulation of social experience. Not a description of it, not a record of it, but a running model that the reader inhabits. When you read a novel, your brain is not passively receiving information. It is actively constructing a social world, inhabiting other minds, running emotional scenarios, and processing the consequences of choices you did not make and may never have to make.

Mar and Oatley’s subsequent research confirmed what this theory predicted. Frequent readers of fiction showed better performance on measures of empathy and theory of mind, the ability to understand and model what other people are thinking and feeling, than people who read primarily nonfiction. The effect persisted even when controlling for personality traits and other individual differences. Something about inhabiting imagined inner lives, specifically, was developing the capacity to understand real ones.

The child under the blanket with a torch was not just entertaining herself. She was building a social and emotional intelligence that could not have been built any other way, because no other activity puts you inside another consciousness the way a novel does. You do not watch a character’s inner life. You occupy it. That distinction turns out to matter enormously for what the brain learns in the process.

The inner world that gets built in the quiet

There is a second layer to what childhood reading produces that is harder to measure but perhaps more important. Reading is an inward activity in a way that almost nothing else in a child’s life is. The school day is external. Sports are external. Play is often social. Even television is a stimulus arriving from outside. But reading is the opposite of stimulus. It is an invitation to generate the entire world yourself, inside your own head, from marks on a page. The images, the voices, the emotional texture of the scene, the sense of place, all of it constructed from the inside.

Research by Mary Helen Immordino-Yang, Joanna Christodoulou, and Vanessa Singh at USC and MIT, published in Perspectives on Psychological Science, examined what the brain is doing when it turns inward rather than outward. Their work on the brain’s default mode, the network that activates during rest, reflection, and internal mental life, found that this inward-facing processing is not idling. It is doing some of the most important cognitive and emotional work the brain performs. Consolidating memory. Imagining future scenarios. Processing social emotions. Constructing a coherent sense of self. And critically, they argued that the development of social-emotional skills may depend on having adequate opportunity for this kind of internally focused thought, and that sustained external stimulation that crowds out the default mode may be genuinely harmful to development.

The child who reads for hours is spending those hours in exactly this inward space, but not passively. They are generating a rich internal world with emotional stakes, populated by people whose minds they are actively inhabiting. It is the default mode in its most engaged form. And the children who spent thousands of hours there grew up having built an interior architecture that children raised on faster, more external stimulation simply did not have the opportunity to construct.

Quieter than the world they lived in

This is what the brief is pointing at, and it is worth slowing down on. The inner life that reading builds is not just well-stocked with information or stories or vocabulary, though it is those things too. It is structurally different from the inner life of someone who never spent time in that quiet inward space as a child. The reader grew up somewhere that did not exist in the shared physical world. They inhabited perspectives and emotional realities that nobody around them could see. They practiced, repeatedly and for enormous numbers of hours, the act of generating meaning from inside themselves rather than receiving it from outside.

This produces something recognizable in adults who were serious childhood readers. They tend to be comfortable with their own company in a way that is not loneliness. They tend to have an inner monologue that is genuinely active, not just repetitive worry but actual thinking, because they spent their formative years in a mental environment that rewarded and practiced that quality of thought. They tend to find the surface level of social interaction slightly thin compared to the level they are used to operating at, which can read as aloofness but is really just the gap between where they live and where casual conversation happens.

I notice this in myself every day here in Saigon. On my morning runs along the river, the inner life is loud and busy in a way that has nothing to do with what is physically around me. I am thinking about something I read, or working through an idea, or just inhabiting a quality of reflection that has no particular object. That interior richness did not appear in adulthood. It was built, over thousands of quiet hours in childhood, by books I chose and worlds I inhabited and people I knew only from the inside.

What it means now

My daughter is four. She does not read yet but she already disappears into her own imagination in ways that remind me strongly of myself at that age. I try not to interrupt it. There is an instinct, in modern parenting, to fill children’s time with activity and stimulation and engagement. But the research on what the inward-facing brain needs, and what childhood fiction reading uniquely provides, suggests that one of the most valuable things a child can do is inhabit a quiet interior world for long stretches of uninterrupted time.

The children who did this with books developed something that has followed them into adulthood. Not just knowledge or vocabulary or empathy, though those too. A self that was built somewhere quieter than the world they actually lived in, and that has been living there ever since.

Buddhism describes the richness of interior experience as something to be cultivated, not escaped. The concept of citta, sometimes translated as mind or heart-mind, points at the interior life as the primary location of meaning, suffering, and liberation alike. In my book Hidden Secrets of Buddhism, I write about the practices that develop this interior richness in adults. But reading, I think, is the natural version of those practices. The one that many of us stumbled into before we had any framework for understanding what it was doing to us.

The child under the blanket was not hiding from the world. She was building the one she would eventually live in.