Shared reading on paper creates a "neural bridge" between parent and child that tablets seem to disrupt. This brain-to-brain alignment is the foundation of how preschoolers learn to name objects and remember stories.
Reading a physical book together synchronizes parent and child brain waves significantly better than reading the same story on a tablet. This neural alignment helps preschoolers build stronger verbal memory and language skills by keeping both parties socially and cognitively "in sync."
The medium of a book changes the brain chemistry of the interaction, even when the words and pictures are exactly the same. For parents of preschoolers, the goal of reading isn't just decoding words; it is establishing "joint attention." This is the shared focus that allows a child to download information from an adult’s brain.
When that focus is fractured—even slightly—the child's ability to name objects and recall the plot of a story takes a measurable hit. If you are deciding whether to pack a thin tablet or a heavy hardback for a flight, or choosing which format to use for the nightly bedtime routine, the paper version provides a superior "social-emotional frequency" for your child’s developing executive functions.
Researchers have long suspected that the "digitalness" of a screen creates a barrier to the natural back-and-forth of human conversation. Previous studies showed that parents talk less and ask fewer open-ended questions when reading from a screen compared to paper.
This study aimed to go deeper by looking inside the skull. Scientists used "hyperscanning"—measuring two brains simultaneously using EEG caps—to see if the physical medium of the book changed how the brains actually fired in tandem. They wanted to know if the "neural bridge" required for language learning is sturdier when the interface is paper rather than glass.
Physical books are more effective at building a shared mental state between parent and child than digital devices.
- Neural synchronization was significantly higher when pairs read printed books. Their brain waves literally matched up more frequently and intensely.
- Joint attention dropped on screens. Parent-child pairs looked at each other or the same page about 25% of the time with print, but that plummeted to about 18% when using a tablet.
- Screens cause "non-joint attention." When reading on a tablet, parents and children spent more time looking in different directions, missing the shared visual cues that anchor a story.
- Brain synchrony predicts performance. The stronger the "sync" measured by the EEG, the better the child performed on subsequent tests for verbal memory and object naming.
The "medium is the message" applies to the brain's hardware. Even a "flat" digital book—one without the distracting games, animations, or "Read to Me" features found in many apps—interferes with the interpersonal connection. This suggests that the issue isn't just about "distracting" apps; it is about the device itself.
A physical book offers a tactile, stable environment that requires a shared physical rhythm—turning a page is a mutual act. A tablet is a private, high-stimulation device by nature. Even when we try to share it, our brains may default to a more solitary "user" mode rather than a "social" mode. The physical book acts as a shared anchor, making it easier for both parent and child to stay on the same cognitive wavelength.
This finding comes from a pilot study with a very small sample size. While the researchers studied 49 pairs, they were only able to collect high-quality, usable brain-wave data from 11 of those pairs.
The study was also conducted within a specific population of Hebrew-speaking families in Israel, and the reading sessions were only five minutes long. We don't yet know if these brain-sync benefits persist over longer reading sessions or if children eventually "habituate" to screens in a way that allows for better synchrony over time. For now, this should be viewed as a provocative snapshot rather than a final word.
- If you want to maximize your child’s language retention, prioritize physical paper books for the "high-value" reading sessions, such as the nightly bedtime story or weekend read-alouds.
- If you are using a tablet to read together, consciously compensate for the "screen gap" by frequently pointing to specific illustrations and making eye contact to manually re-establish the joint attention that paper creates naturally.
- If your child is struggling with naming objects or following a plot, remove the digital middleman. Return to paper books for a few weeks to see if the increased neural synchrony helps them "lock in" the new vocabulary.
- If you are traveling and must use a digital device, choose the simplest, most static version of the book possible. Avoid "interactive" features that encourage the child to tap the screen rather than talk to you.
The human brain evolved to learn through social connection, and paper books provide the most stable interface for that connection. While tablets offer convenience, they seem to subtly de-sync the parent-child relationship at a neural level. To build your child's verbal memory, stick to the tech that doesn't require a battery.
Jomaa F, Ebraheem F, Horowitz-Kraus T (2025). Greater Parent-Child Brain Synchronisation During Printed Book Versus Screen Reading Using Hyperscanning Electroencephalograph Data. Acta paediatrica (Oslo, Norway : 1992). doi:10.1111/apa.70007 — ncbi.nlm.nih.gov