Words and Pictures Together, Not Decoration

I’ve sat through enough CPD sessions to know that when someone starts talking about “multimodal cognitive load theory,” they’re usually about to sell you a subscription to a software suite you don’t need. They make it sound like you need a graphic designer to explain the causes of the Industrial Revolution, but that’s not how it actually functions in a classroom with thirty-two teenagers and a broken interactive whiteboard. The truth about how dual coding works isn’t found in a glossy PowerPoint; it’s found in the messy, practical reality of giving a student a visual anchor so they don’t drown in your words.

I’m not here to give you a lecture on neurobiology or tell you to redesign your entire slide deck from scratch. Instead, I want to talk about the low-stakes versions that actually survive a Tuesday afternoon. I’m going to show you how to use simple sketches, icons, and spatial layouts to make your explanations stick, even when you’ve only got thirty seconds of prep time. We’re going to focus on what actually moves the needle in a real lesson, stripped of the academic fluff.

Decoding Paivios Dual Coding Theory Without the Academic Fluff

Look, you don’t need to sit a masters in cognitive psychology to get the gist of what Allan Paivio was on about. At its heart, Paivio’s dual coding theory is just the fancy academic way of saying that our brains have two different channels for processing information: one for words and one for images. When you just lecture at a class, you’re hammering that verbal channel until it hits a wall. But if you pair your explanation with a simple sketch or a diagram, you’re tapping into both visual and verbal processing simultaneously.

It’s not about being an artist—heaven knows I can’t draw a straight line if my life depended on it. It’s about understanding that when we use both channels, we aren’t just doubling the work; we are effectively expanding the available space in a student’s mind. By providing a visual anchor, you help them move from just hearing a fact to actually encoding information visually, which makes it much harder for that knowledge to slip through their fingers by the time the bell rings for lunch.

Visual and Verbal Processing Making Information Stick for Good

The core of the idea is actually quite simple: our brains have two different channels for processing information. When you’re standing at the front of a room, you’re essentially trying to feed both the auditory and the visual channels at once. If you just talk, you’re relying entirely on one lane. But when you pair a spoken explanation with a simple, relevant image, you’re leveraging visual and verbal processing to create two separate mental paths to the same concept. It’s not about making things “pretty”; it’s about giving their brains two ways to grab hold of the same idea.

The catch—and there is always a catch in a real classroom—is that you have to be careful not to overload the system. If you put a massive, cluttered diagram on the screen while you’re also lecturing about a different topic, you aren’t helping; you’re just creating chaos. This is where cognitive load theory comes in to save your skin. You want to provide just enough visual support to anchor your words without making the students work harder just to decipher the slide. If the visual is too complex, they spend all their mental energy trying to make sense of the picture rather than actually learning the content.

Five Ways to Use Dual Coding Without Losing Your Mind (or Your Lesson Time)

• Stop the slide deck madness. You don’t need a high-definition graphic for every point; sometimes a quick, slightly wonky sketch on the whiteboard while you’re talking is more effective because the kids see the image and the explanation being built at the exact same time.
• Watch out for the “split-attention” trap. If you put a massive paragraph of text on a slide and then try to talk over it, you aren’t helping them; you’re just creating cognitive traffic jam. Give them a simple icon or a diagram, and keep the heavy lifting in your voice.
• Use symbols as anchors, not decorations. A little arrow, a lightning bolt for a key concept, or a specific shape around a definition isn’t just “fluff”—it’s a visual hook that helps a kid who has completely tuned out your voice to find their place again when they look up.
• Don’t overcomplicate the visual. If the diagram is so intricate that you spend ten minutes explaining the diagram instead of the actual history or science, you’ve failed. The visual should be a shortcut to understanding, not a new hurdle to jump over.
• Let them do the drawing. Instead of giving them a perfect handout to colour in, ask them to scribble their own quick representation of a concept in their books. The act of translating your words into their own messy sketch is where the actual learning sticks.

The Bottom Line for Your Next Lesson

Forget the polished infographics; if you can scrawl a messy, functional diagram on the whiteboard that anchors your spoken words, you’ve done 90% of the heavy lifting.

Don’t overload the visual; if your slide is a wall of text and a picture, you aren’t helping them learn, you’re just giving their brains a reason to tune out.

Use it as a survival tool, not a design project—dual coding is about making sure the concept sticks the first time so you aren’t re-explaining it for the tenth time during period five.

The Reality of the Visual Anchor

Dual coding isn’t about being a graphic designer or producing some polished, Pinterest-ready presentation; it’s about giving a student a mental hook to hang your words on, so when they walk out of your room, they aren’t just remembering a voice, they’re remembering a shape.

Ellery Mwangi-Selkirk

Don't Let the Theory Overwhelm the Teaching

Look, we’ve covered a lot of ground, from Paivio’s cognitive architecture to the practicalities of how the brain handles simultaneous streams of data. But if you take nothing else from this, remember that dual coding isn’t about becoming a graphic designer or spending your Sunday evening crafting perfect infographics on Canva. It’s simply about reducing the cognitive load by giving students a visual anchor for your words. Whether it’s a rough sketch on a whiteboard, a simple timeline, or a quick diagram in their notebooks, the goal is to provide a second way in. If you can pair your explanation with a visual that isn’t a distraction, you’ve done the heavy lifting of making the information stick without needing a degree in instructional design.

At the end of the day, we are all just trying to survive the lesson and ensure that something—anything—actually stays in those heads once the bell rings. Don’t get caught up in the trap of thinking every slide needs to be a masterpiece; the best dual coding often happens in the messy, spontaneous moments of a live explanation. Focus on the clarity of the connection, not the polish of the picture. You’ve got enough on your plate with the marking pile and the next inspection looming; just aim for small, functional wins in every lesson. That is where the real learning happens.

About Ellery Mwangi-Selkirk

Most educational advice is written for a classroom that does not exist — twenty motivated pupils, unlimited preparation time, no behaviour to manage. I write for the room you are actually in. What retrieval practice looks like when marking is already three weeks behind, why the seating plan matters more than the starter activity, and which of the last decade's initiatives left anything behind. Nineteen years taught me that the good ideas survive contact with a wet Wednesday and the rest do not.