Laws of Perception · cognitive-bias
Von Restorff Effect
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When several similar things sit together, the one that stands out is the one people notice and remember. This 'isolation effect' is why a single high-contrast primary button among ghost buttons gets clicked, and why a 'Recommended' pricing tier draws the eye — but it also means if everything shouts, nothing is remembered.
Where it comes from
The effect is named for Hedwig von Restorff, a German psychiatrist and psychologist who demonstrated it in a 1933 study: when people memorised a list where one item differed (a number among letters, say), they recalled the odd one far better than the rest. The finding predates screens by decades, but it maps perfectly onto interface emphasis — distinctiveness drives both attention and memory.
Origin: Hedwig von Restorff's 1933 isolation-effect memory experiments
In the wild
- Primary buttons
One solid, high-contrast call-to-action among outline buttons pulls attention straight to the intended action.
- Pricing tables
The highlighted 'Most popular' plan is deliberately isolated with colour and a badge so it's the one you remember.
- Notification badges
A small red dot on an icon stands out against everything monochrome around it.
Further reading
Don't just read it — feel it.
Play the 3-minute game and let your own reactions prove the law.
Play the lesson