Design differently

Websites, shelves, and product lists—everywhere, elements compete for attention. The intuitive assumption is that all options should be presented equally so customers can compare them rationally. Yet users overlook important information, scroll past it, and abandon their search. The question is: How strongly does visual highlighting direct attention? Which factors determine what remains in memory—and what evidence exists about this?

Studies

The Original Isolation Experiment

In 1933, Hedwig von Restorff conducted a series of memory experiments at Berlin University. Test subjects viewed lists of items—mostly similar elements such as syllable pairs or numbers. In each list, one item stood out: for example, a colored syllable among black ones, or a number among letters. After a pause, participants were asked to recall the items. The surprising result: the distinctive element was remembered 2-3 times more frequently than the uniform elements. A colored syllable in a list of 10 black ones had a recall rate of 65%, while the black syllables achieved only 23%. The effect was so robust that it occurred regardless of the item's position in the list or the type of deviation.

The Color Highlighting Experiment

Reed Hunt and Janellen Worthen systematically tested which type of distinction works most effectively in a 1982 study at the University of North Carolina. They had 120 students view lists of 16 words on a computer screen. Some lists appeared entirely in black, while others featured one word in red, in a larger font, or enclosed in a border. One week later—without warning—students were asked to recall the words. The red word was remembered by 78% of participants, while the average black word had only a 12% recall rate. Color difference proved more effective than size (63%) or border (51%). The surprising finding: the effect was even stronger after one week than after one hour—the isolation enhanced the transition into long-term memory.

Principle

Which principle for Customer Experience Design can be derived from this? The Von Restorff Effect demonstrates that visual differentiation is a powerful tool for guiding attention—but only when used strategically and sparingly. Focus visual emphasis exclusively on the most important elements of your customer journey, because what looks different is automatically remembered better and receives greater attention. However, the effect only works with genuine isolation: when everything is highlighted, nothing stands out, and the cognitive impact is lost entirely. The principle is particularly effective at decision points, calls-to-action, or critical information that customers absolutely need to retain. The following guidelines show how to implement this principle in practice.

Guidelines

Highlight a primary CTA

Define ONE primary action for each page and emphasize it visually through color, size, or contrast. Design all secondary actions with restraint. For example: Use a signal color for the 'Buy now' button while presenting 'Learn more' as a simple text link. This prioritization guides attention and simplifies decision-making.

Visually isolate critical information

Use visual isolation for information that users must not miss under any circumstances: risks, deadlines, exclusions, and important limitations. Don't embed these details in body text; instead, highlight them in colored boxes, with icons, or in a larger font. For financial products, for example, display cancellation periods in an orange box rather than burying them in gray fine print.

Visually highlight the recommended option

In product comparisons or pricing tables: Highlight the recommended option through visual differentiation—a "Most Popular Choice" badge, a distinctive background color, or slightly larger sizing. This reduces decision-making effort and guides undecided customers toward the optimal choice. Important: Highlight only one option; otherwise, the effect is diluted.

Visually emphasize unique selling proposition

If your product has ONE standout feature that sets you apart, make it visually distinct in your feature list. Don't rely on text like "Only with us!"—use design instead: an icon in your accent color, slightly larger, with a background. Visual distinction makes the feature far more memorable than any verbal emphasis.