Words and pictures

Dual Coding

Combine words and visuals — your memory uses both.

What the Research Says

Your brain stores words and images in two separate memory systems, and information is much better remembered when BOTH are used. Dual coding is not the same as “being a visual learner” — learning-styles theory has been debunked. Everyone benefits from combining words with visuals, regardless of any self-reported style preference.

Evidence Base

Study	Finding	Impact
Paivio (1971)	Original dual-coding theory: verbal and visual memory traces are separate and additive.	Two routes to recall is better than one.
Mayer (2001, 2014)	Multimedia learning research across 300+ studies: well-designed words+visuals combinations produce ~40% better transfer than words alone.	Well-placed visuals turn passive reading into active learning.
Dunlosky et al. (2013)	Dual coding is one of the few techniques rated “effective in most contexts” by the Association for Psychological Science.	Evidence-backed across age groups and subjects.
Castro-Alonso et al. (2019)	Student-generated visuals (drawing) produced bigger gains than pre-made visuals.	Draw it yourself, don’t just look at a diagram.

Step-by-Step Method

1
Pick a topic with relationships — causes and effects, timelines, comparisons, processes. Dual coding shines when there’s structure to capture.
2
Choose the right visual format — timeline for chronology, flowchart for processes, comparison table for differences, mind map for themes, annotated diagram for systems.
3
Draw it yourself — by hand or in a simple tool. Don’t just photocopy one from a textbook. The act of creating the visual forces your brain to organise the information.
4
Keep text minimal — labels, not sentences. The text and the visual should say different things. Duplicate labels distract (“redundancy effect”).
5
Revisit blank versions — print or redraw your visual with the labels removed. Fill them in from memory. This combines dual coding with retrieval practice.
6
Compare versions over time — a week later, redraw from memory. Spot the bits you missed.

Example 1

After Human Computer Interface (HCI) in Everyday Life (L2), draw a hub-and-spoke diagram by hand: ‘HCI’ in the centre circle, six spokes for banking, embedded systems, entertainment, fitness, home appliances, and retail. On each spoke, write two words for the device type and two words for the interaction method (e.g. ‘fitness — wearable — touch/voice’). Keep labels to 2–4 words. A week later, redraw the diagram from memory on a blank page. Any missing spoke is a gap. This technique works especially well for HCI because the content is about visual interfaces — encoding it visually reinforces the topic itself.

Example 2

Draw a three-column table by hand for Cyber-security: Threats & Impacts (L5) and Prevention Measures & IT Legislation (L6). Column 1: threat category (DoS / hacking / malware / social engineering). Column 2: one sub-type per row with a two-word definition. Column 3: the matched prevention measure. Keep each cell to four words. Draw a thick dividing line between physical prevention measures (left box) and logical prevention measures (right box) at the bottom of the table. A week later, redraw from memory — any missing cell is a revision target. Linking threat to countermeasure visually trains the ‘which prevention measure would mitigate this threat?’ question type.

Common Pitfalls

Decorative visuals. A picture that looks nice but doesn’t convey information adds cognitive load without the benefit.
Copying someone else’s. The learning happens while you make it. A textbook diagram is useful for reference, not for dual coding.
Too much text. If your “mind map” is paragraphs joined by lines, it’s still just text. Keep labels to 2–4 words.
Only making it once. One-off diagrams are useful. Ones you redraw from memory over weeks are powerful.

When to Use This

Mid-revision cycle — after you’ve learnt the basic facts and are starting to see connections. Before the exam, try a “one-page summary” for each unit combining a key diagram with 5–10 labelled points. Carry these in your bag. Use the night before.