Learn with Pictures: The Power of Dual Coding

Dual coding is the idea that we store information in two channels, one for language and one for images. When you learn something with both, you build two routes back to it instead of one.

That redundancy is the point. If the word slips your mind during a test, the picture might still be there, and the other way round. Two paths to the same idea make it far harder to lose.

This is the part people worry about, but a good learning drawing is not a masterpiece. A rough box, a stick figure, or a single arrow is plenty. The messiness is fine, because the thinking you do while drawing is what helps.

The real work is deciding how to show an idea. To sketch how a plant makes food, you have to choose what goes where and what points to what. That small act of translation forces you to understand the idea, not just read past it.

You can slip dual coding into what you already do. A few easy moves:

• •Draw a quick diagram of how the parts of a process connect.
• •Turn a list into a simple timeline or map.
• •Add a tiny doodle next to a hard term to anchor it.
• •Redraw a textbook figure from memory, then check it.

Artistry is beside the point. What matters is that the arrangement on the page carries meaning: a timeline puts events in order left to right, a flowchart shows what leads to what, a map shows what is near what, a table lines up things that are being compared. Position is information, and it is information your verbal channel is bad at holding.

So the useful question is not can I draw this but what is the shape of this idea. A sequence wants a line. A cause and its effects want arrows. Parts of a whole want a labelled sketch. Categories want columns. Once you have the shape, the drawing is just boxes and lines.

A photograph next to a paragraph, chosen because it looks nice, adds almost nothing and can pull attention away from the words. The picture has to carry the structure of the idea, not decorate it. Textbooks are full of images that fail this test, which is one reason students learn to ignore them.

Not everything has a visual form either. An abstract argument in philosophy may have no natural shape, and forcing one can distort it. Use dual coding where relationships, sequences or parts are what you need to hold, and use plain words where the idea really is just words.

Maths is full of ready-made visuals that make abstract ideas concrete. A number line shows why negative numbers behave the way they do. A bar split into equal parts makes fractions easy to compare, and a rectangle divided into sections shows why multiplying out two brackets gives four terms. When a method feels like a string of rules, ask whether there is a picture behind it. Very often there is, and seeing it turns a rule you have to remember into an idea you understand.

For languages, pictures can replace translation. Instead of a flashcard with the English word on one side, put a small sketch or image on the front and the new word on the back. You then link the word directly to its meaning rather than to another word, which is closer to how you learned your first language. This works especially well for concrete nouns and actions. For trickier grammar, a simple diagram, such as a timeline showing when each tense applies, can make a pattern click.

A common way to overload learners is to show a slide full of text while someone reads the same text aloud. It seems helpful, since the message arrives twice, but both versions compete for the same language channel. Your eyes race ahead of the speaker or lag behind, and attention splits instead of doubling. Research on multimedia learning has fairly consistently found that people tend to learn better from spoken words with a relevant picture than from spoken words plus the same words printed on screen. Reading a slide silently or listening without it both tend to work better than doing both at once.

This matters whether you are making study materials or choosing them. If you record yourself explaining a topic, talk over a diagram rather than over your notes. If you watch a video lesson, favour ones where the narration explains a visual rather than repeating text. And when you revise with someone, sketch while you talk. The words go in through one channel, the picture through the other, and that is dual coding working as intended.

Words and pictures are a team, so stop making your brain work with one hand tied. Next time an idea feels slippery, sketch it, even badly. The doodle you would never frame might be the thing you remember when it counts.