Dual Coding: Why Words Plus Pictures Double What Children Remember
Reviewed byMedical & Pedagogical Advisory Team
Disclaimer: This article is for educational purposes based on peer-reviewed research and does not replace professional medical or diagnostic advice.
When a child studies a page of text alone, their brain stores one trace of that information. When the same idea is paired with a relevant picture or diagram, the brain builds two connected traces — a verbal one and a visual one — and either can later trigger recall of the other. This is dual coding theory, and it's one of the most consistently replicated findings in learning science.
What is dual coding theory?
Psychologist Allan Paivio proposed that the mind processes information through two separate but connected systems: a verbal system for words and language, and a nonverbal system for images and spatial information. Information encoded in both systems at once is easier to retrieve than information encoded in just one.
The key mechanism is redundancy of retrieval routes. If a child forgets the words describing how a heart pumps blood but still remembers the diagram, the image alone can bring the concept back to mind — and vice versa. Two weaker traces linked together often outperform one strong trace on its own.
Why does combining words and pictures nearly double recall?
Studies applying dual coding to real study materials consistently find that students remember substantially more from text-plus-relevant-image combinations than from text alone, with some experiments reporting close to double the recall on later tests.
The effect isn't just 'pictures are nice' — it depends on the image genuinely representing the same content as the words, not merely decorating the page. A relevant diagram of a process does far more for memory than an unrelated photo placed next to the same paragraph.
How does this connect to Mayer and Moreno's multimedia learning research?
Richard Mayer and Roxana Moreno extended dual coding into a practical multimedia learning principle: people learn better from words and pictures presented together than from words alone, but only when the materials are designed to avoid overloading working memory.
Their research also found that narration paired with animation beats narration paired with on-screen text describing the same animation — because reading text and watching images compete for the same visual channel, while spoken words and images use separate channels and reinforce each other.
How can families and students apply dual coding to studying?
Encourage children to sketch a simple diagram, timeline, or picture summarizing a passage they've just read, even a rough one. Drawing forces them to translate words into a visual structure, which is exactly the dual-coding process research shows strengthens memory.
When reviewing textbook material, look for or create a labeled diagram that captures the same information as the paragraph nearby, and study the two together rather than the text in isolation. On exam day, the visual memory often surfaces first and pulls the verbal details along with it.
Evidence & sources
Peer-reviewed research this article is based on.
Dual Coding Theory and Education
Paivio, A. · PubMed · 2003
The Dual-Coding and Multimedia Learning of Anatomy
Meyer, K., et al. · PMC · 2019
Nine Ways to Reduce Cognitive Load in Multimedia Learning
Mayer, R. E., & Moreno, R. · Educational Psychologist · 2003