Ace
Short answer: visualisation helps you study because your memory stores pictures and words in two connected systems, so an idea you have both read and seen has two ways back into your head. This is called dual coding. Drawing is especially strong: in experiments, people remembered more than twice as many words they had drawn as words they had written out. The trick is to make the picture yourself, from memory, rather than just looking at someone else's.
Why do pictures help memory?
Dual coding theory, set out for educators by Clark and Paivio (1991), describes memory as two linked systems: one for language and one for images. A word like "mitochondrion" lives in the verbal system. A sketch of a bean-shaped organelle with folded inner walls lives in the visual one. When both are connected, remembering either can pull up the other.
That gives you two practical advantages. First, you have a second retrieval route if the words will not come. Second, turning a paragraph into a picture forces you to decide what the parts are and how they relate, which is already a kind of understanding. A flowchart cannot be vague about which step comes first.
The drawing effect
Researchers at the University of Waterloo tested this directly. Wammes, Meade and Fernandes (2016) gave students simple words and 40 seconds each to either draw the word or write it out repeatedly. In a surprise recall test, students often remembered more than twice as many drawn words as written ones. Drawing also beat listing the object's features, picturing it in your head and looking at a picture of it. The quality of the drawing did not matter.
The authors' explanation is that drawing combines three things at once: thinking about meaning, making a visual image and moving your hand. Each adds a thread to the memory.
One honest limit: those studies used single words. Drawing a whole topic is harder, and the evidence for drawing as a learning strategy for complex material is more mixed. Fiorella and Mayer (2016) include drawing among eight "generative" strategies that help when learners actively make something from the material, and note that it works best when students already know enough to draw something meaningful, and when they get some guidance on what to draw.
Five ways to use visuals when you revise
- Redraw the key diagram from memory. Look at the diagram in your slides for a minute, close them, and draw it. Then compare and fix what you missed. This is active recall with a pencil.
- Turn processes into flowcharts. Any sequence (a signalling pathway, a legal test, a historical chain of events) becomes clearer as boxes and arrows. Doing it without notes shows you exactly which step you do not know.
- Pair every definition with a tiny sketch. A stick-figure doodle next to a key term is enough. You are building the second code, not making art.
- Draw the comparison. When two ideas are easily confused, put them side by side in a two-column sketch or a Venn diagram. The picture makes the differences hard to blur.
- Make a one-page map of the chapter. After finishing a topic, draw how the main ideas connect on a single sheet. If you cannot place something, that is your next thing to revise.
Where visualisation goes wrong
- Copying a diagram while looking at it. Tracing feels productive but involves almost no recall. Look, then close, then draw.
- Spending an hour on colour. A beautiful mind map is often a time sink. Rough and fast is fine; the thinking is what counts.
- Pictures with no words. Dual coding needs both codes. Label your sketches.
- Treating it as the whole plan. Visuals help you encode an idea. You still need to practise pulling it back out, spaced over several days.
Test the picture, not just the page
The best check is a question you answer without looking: can you label a blank version of the diagram, put the steps of the process in order, or pick the right part from four options? That is where visualisation and testing meet. If your lecture slides are full of diagrams, Ace can turn them into practice: it builds label-the-diagram questions using screenshots from your own file, alongside multiple-choice and put-the-steps-in-order questions, so you practise recalling the picture you were taught with. Our guide to memorising anatomy shows the same idea applied to a very visual subject.
Frequently asked questions
Do I need to be a "visual learner" for this to work?
No. Dual coding and the drawing effect were found in ordinary groups of students, not only in people who describe themselves as visual. Adding a picture to words gives almost anyone a second route to the memory.
Does it matter if I am bad at drawing?
No. In the Waterloo experiments, drawing quality made no difference. A rough sketch that captures the idea is enough.
Is a mind map the same as dual coding?
It can be, if it includes images or a clear spatial layout as well as words. A mind map made only of words in bubbles is mostly a reorganised list.
How is this different from just watching videos?
Watching gives you someone else's pictures. The memory benefit comes mostly from making or recalling the picture yourself.
Sources
- Clark, J. M., & Paivio, A. (1991). Dual coding theory and education. Educational Psychology Review, 3(3), 149–210. doi.org/10.1007/BF01320076
- Wammes, J. D., Meade, M. E., & Fernandes, M. A. (2016). The drawing effect: Evidence for reliable and robust memory benefits in free recall. Quarterly Journal of Experimental Psychology, 69(9), 1752–1776. Summary: University of Waterloo
- Fiorella, L., & Mayer, R. E. (2016). Eight ways to promote generative learning. Educational Psychology Review, 28(4), 717–741. doi.org/10.1007/s10648-015-9348-9
