Von Restorff effect (isolation effect)

The Von Restorff effect (also known as the isolation effect) is a cognitive bias in which, out of a series of similar things, we best remember the one that differs from the rest. When one item in a pile of identical ones stands out in colour, size or shape, our brain automatically focuses on it and stores it better. This sentence, for example, makes me picture the scene from The Matrix with the woman in the red dress. Being different is a signal that something might be important. That is exactly why, in a sea of similar offers, the winner is the one that dares to be different, not the loudest one.

Classification of the cognitive bias

• Cause (Cognitive Bias Codex): Too much information
• Mental domain: Perception and memory
• Marketing function: Memory and perception
• Customer journey: Attention
• Cialdini’s principles: not applicable
• System 1 / System 2: System 1 (fast, automatic)

In a nutshell

• What it is: what stands out from its surroundings grabs our attention and we remember it better.
• Why we do it: we treat being different as a signal of something important.
• Where you’ll see it: a coloured button, a highlighted pricing plan, distinctive packaging on the shelf.
• How to use it: make what matters stand out clearly from its surroundings.

A real-life story

The effect was discovered and described in 1933 by the German physician and psychologist Hedwig von Restorff, after whom it is named. In her experiments, she gave people lists in which most items were of the same type and one differed markedly. People remembered that different item far more often than the others. One item that stood out beat a whole series of ordinary ones.

You know it from every online shop. In a table of three pricing plans, one is highlighted in colour and labelled “most popular”. That is the one that sticks with you and the one you lean towards. Or the “Buy” button that glows in a different colour from the rest of the website. It stands out, so your eye finds it instantly.

How the Von Restorff effect works

Our brain constantly filters a flood of stimuli, looking for whatever breaks the pattern. Anything that disrupts the expected sequence gets priority attention and a better place in memory. It is a defence mechanism, because being different could always mean an opportunity or a threat. The effect is linked to the serial position effect, because highlighting can rescue even the middle of a list, and to the halo effect, because we more readily attribute other qualities to whatever stands out and grabs our attention.

Use in marketing

1. A prominent CTA. Give your call-to-action button a contrasting colour that the rest of the page does not use. It must stand out.
2. A highlighted pricing plan. Set the recommended option apart with colour, a frame or a label so it draws the eye.
3. Different packaging on the shelf. A distinctive design among competitors catches attention sooner than even the best product that blends in.
4. An unexpected element in a campaign. Something that defies expectations is what people remember and like to share.
5. Contrast in content. A single highlighted quote, number or box keeps attention in a long text.

How to use the Von Restorff effect in moderation

1. Highlight only one thing. When everything stands out, nothing stands out. Choose one main element.
2. The difference must make sense. Highlight what you want people to remember, not something random.
3. Be careful as a customer. The highlighted option is not necessarily the best one for you, just the most visible.

How it interacts with other biases

The Von Restorff effect is the perfect partner for the serial position effect, which says that people forget the middle of a list. But if you make the middle item clearly different, you rescue it from the memory gap through the isolation effect. You can see this in action in a three-plan price list. The middle plan is the natural choice thanks to the compromise effect, and if you also highlight it in colour and label it “most popular”, you add the Von Restorff effect and social proof. Three biases pull the customer towards a single option.

Frequently asked questions

What is the Von Restorff effect?

A cognitive bias in which, out of a series of similar things, we best remember the one that differs clearly from the rest.

How can the Von Restorff effect be used in marketing?

By making a key element, such as a call-to-action button or a recommended pricing plan, stand out clearly through colour, size or a label.

Patrik Pilous

I am a marketing strategist and SEO consultant. I love the world of marketing, the internet and AI. I am at my best when planning business growth, setting and executing marketing strategy and optimising websites (SEO, GEO and, above all, sales).