The isolation effect in one paragraph
In the 1930s, the psychologist von Restorff asked people to memorize lists in which one item looked different from the rest, for example a number among words. The odd item was remembered better. This became known as the isolation effect, and it is one of the older, more reliable findings in memory research.
The key word is different. The item did not shout. It simply differed from its neighbours. That is useful for a designer, because it means contrast does the work, and the same element placed in a crowd of equally loud elements will vanish. Hick's law pairs well with it: fewer options make the one that differs easier to find.
On a web page: one button that is not like the others
Think of a Mission chiropractic clinic's home page. There are a navigation bar, a banner, three service boxes, a customer comments strip and a footer. If the booking button is the same grey as the links around it, nobody finds it. If four things on the page are bright orange, nobody knows which one matters.
Choose the single action you want, usually booking or calling, and give it the strongest contrast on the page: a clear colour against a quiet background, with plain words such as Book a visit. Make everything else calmer. The goal is that a visitor glancing for two seconds can say where to click. This is the heart of good web design: one path, clearly marked. Tests in conversion rate optimization often start with exactly this question.
In an email: one link, one ask
Email marketing follows the same rule with fewer pixels. A newsletter from a nursery near Chilliwack might carry a seasonal tip, a plant of the month, a sale, a workshop and a social media badge. The reader scans it, remembers the plant picture and does nothing.
Write the email around one action, such as reserving a spot at the Saturday workshop, and make that the only styled button. Keep other links as plain text. Subject lines can use the same idea by naming the one thing inside. Over time, you can compare how many people click when the email has a single clear ask. The growth check can show whether follow-up is where your leads slip away.
On a menu: the one dish you want remembered
Printed and digital menus offer a gentle version of the effect. A family restaurant in Agassiz might box one dish, perhaps the house special that suits the kitchen and the customer, and leave the rest in plain type. Diners notice the boxed item and often choose it.
The same trap applies. If five dishes sit in boxes with icons and bold type, the menu is simply busy. The aim is to guide, not to push. Pick an item you are proud of and which makes you a fair margin, and let the plain type around it do its job. The peak-end rule is a reminder that diners remember the end of a meal as well as the standout dish.
Where it backfires, and what to try
Emphasis wears out. A banner that flashes, a pop-up on every page or a button that jumps around trains people to ignore it. Contrast also has to be readable: a pale button on a pale background is different but not visible. Check colours with a contrast tool and look at your page on a phone in daylight. The conversion rate calculator will show whether a change lifted enquiries.
Remember that being remembered is not the same as being chosen. The isolation effect helps people notice something, not want it. Pair the standout element with an honest offer, and see colour psychology on this site for what colour can and cannot do.
- Screenshot your busiest page and circle every element that is bold, bright or animated
- Decide the one action that matters and keep emphasis only on it
- Turn secondary email links into plain text
- Box a single dish or product on a menu or price list
- Check the standout button for readable contrast on a phone screen
Standing out when everything is a feed
As more of your customers scroll fast through feeds and summaries in 2027, the one clear element on a page matters even more. A plain layout with one obvious next step is easier to read on a small screen and easier for assistants to describe. Simplicity is a strategy, not a lack of effort.
- 01Design for the two-second glance first
- 02Retire decorations that compete with the main action
- 03Re-test your page after every redesign
Questions & answers
It is the finding that an item which differs from the others around it is remembered better. Von Restorff described it in the 1930s, and it is also called the isolation effect. In marketing it supports giving one important action a distinct look.
Choose the single action you most want visitors to take and make it the most visible element, with strong contrast and clear wording. Keep other buttons and links calmer. If every element is emphasised, none stands out and the effect disappears.
Not necessarily. What matters is contrast with the surroundings. On a page full of bold colour, a quiet plain button can be the one that differs. Check that text and buttons are clearly readable, since contrast, not hue, decides whether something is seen.
Yes. When several items compete for attention, visitors cannot tell which matters, and the contrast that creates the effect is lost. A page or email with one clear emphasis usually performs better than one that highlights everything. Test it against your own enquiry numbers.
