We don't look at everything equally. We notice what's already on our mind — and ignore the rest. Designers who understand this can guide attention to what matters. Those who abuse it can hijack it.
You're walking through a city you've never been to. You're hungry. Suddenly, you notice every restaurant on the street — signs you would have walked straight past otherwise. Nothing changed about those signs. What changed was your mental state. Hunger primed your brain to look for food, so food-related information jumped out at you.
This is attentional bias: we tend to pay more attention to things that match what we're already thinking about or feeling. It's not a flaw — it's efficient. Your brain can't process everything at once, so it prioritises what seems most relevant right now.
In interface design, this plays out constantly. A user searching for “UX Designer remote” will notice those words the moment they appear on a page. A user with an anxiety about missing messages will notice every red notification dot. The question for designers is: are you directing that attention toward what genuinely helps the user — or toward what benefits you?
“We don't attend to the world as it is — we attend to the world as we expect and need it to be.”
— Daniel Kahneman, Thinking Fast and Slow, 2011
When someone searches “UX Designer remote,” those words are already loaded in their head. They're what the user came to find. Highlighting the matching words in search results uses attentional bias honestly — it makes relevant information visually distinct, so the user's eye jumps straight to the words they're looking for.
Without highlighting, every job listing looks the same. The user has to read every card to find the relevant details. With highlighting, those details pop immediately. Same content — completely different scanning experience.
This works because the highlighted words match what the user already has in mind. Attentional bias does the rest automatically. You're not forcing the user to pay attention — you're meeting their attention where it already is.
Red notification badges are one of the most effective attention tools in mobile design — and one of the most abused. The red dot works because our brains are wired to notice red. It originally signalled danger. Today, apps use it to signal “something needs your attention.”
When the badge is honest — “someone replied to your message” — it's genuinely useful. The user needs to know. But when every tab has a red badge just because there are unread promotional emails or marketing notifications, the signal becomes noise. The red still grabs attention. But now it's grabbing it for nothing. After a while, users learn to ignore all badges — including the important ones.
The good version is how Slack actually works — and for good reason. Red appears only for direct messages and @mentions — things that require your personal response. Regular unread channels get a bold name or a grey count. The eye immediately goes to the red items. Everything else is readable without being alarming. The same number of unread messages, completely different experience.
This is the ethical test for any attention-grabbing design element: does the user benefit from having their attention pulled here, or only the product? A red badge on a newsletter is stealing attention. A red badge on a direct message is earning it.
Every time you reach for bold text, a coloured highlight, a badge, or an animation — you're making a claim about what the user should notice. The claim should be true. If it's not, you're borrowing attention you haven't earned.
A practical rule: highlight the thing the user came looking for, not the thing you want them to buy. Show urgency badges on things that are actually urgent. Use animation for state changes, not decoration. When everything screams for attention, nothing gets it.
Kahneman, D. (2011). Thinking, Fast and Slow. Farrar, Straus and Giroux. · Posner, M. I. (1980). Orienting of attention. Quarterly Journal of Experimental Psychology, 32(1), 3–25. · Brignull, H. (2010). Dark patterns. darkpatterns.org.