Laws of UX
Selective Attention
Users actively filter out everything not relevant to their current goal — elements outside their attention tunnel are invisible regardless of how prominent they are.
Where it comes from
Selective attention is a foundational idea in cognitive psychology — the mind's ability to focus on what's relevant and filter out the rest. The famous 'invisible gorilla' experiment by Daniel Simons and Christopher Chabris is its best-known demonstration: absorbed in a task, people miss things in plain sight.
Why it matters for your website
Selective attention is the mechanism behind both banner blindness and change blindness — and much more besides. Users in task mode are not passively receiving everything on a page; they are actively filtering for task-relevant signals and suppressing everything else. Elements that designers consider prominent may be functionally invisible to users whose attention tunnel is pointing elsewhere. The implication for audit findings is precise: location matters, but relevance-to-current-goal matters more. Content the user doesn't expect to need won't be seen, regardless of size or position.
Prominence is not the same as visibility. A user locked onto a goal will look straight past an element they don't expect to need — however large, bright, or central it is. This is why 'we made it bigger' so often fails to fix a 'nobody sees it' problem: size doesn't help if the element falls outside the user's current attention tunnel.
The practical lever is relevance, not just emphasis. To be seen, an element has to either sit on the path the user is already travelling toward their goal, or connect to what they're actively looking for. Placing information where the task naturally leads beats shouting at people from the margins.
Wrong vs right
An important notice placed in a sidebar or banner, away from the task flow, where goal-focused users filter it out.
The same notice placed directly in the path of the task, where the user's attention already is.
A promotion styled like an ad, in an ad-shaped slot, that banner blindness renders invisible.
The message integrated into the main content, looking like part of the page rather than an advert.
Assuming a change will be noticed because it's visually prominent, when users in task mode are scanning only for what's relevant.
Surfacing the change within the user's task path, tied to what they're actively trying to do.
Understanding Selective Attention
Selective attention is the mind's filter: faced with far more sensory input than it can process, it focuses on what's relevant to the current goal and suppresses the rest. This isn't a flaw — it's how people function in a busy world — but it has stark consequences for design. Users in task mode are not passively absorbing your page; they're actively hunting for task-relevant signals and screening everything else out.
It's the mechanism underneath several other principles. Banner blindness (ignoring ad-like elements) and change blindness (missing changes you didn't expect) are both selective attention in action. The unifying lesson is that an element's prominence — its size, colour, or position — is no guarantee it will be seen. If it falls outside the user's attention tunnel, it can be functionally invisible.
For design, this sharpens where things belong. Relevance to the current goal matters more than raw prominence: content the user doesn't expect to need won't be seen, however loud it is. The reliable way to be noticed is to sit on the path the user is already on, or to connect visibly to what they're searching for. It connects to banner blindness, change blindness, and involuntary attention.
How Kweri checks it
Whether a specific user will notice a specific element depends on their goal in the moment, which no static review can fully model — and Kweri is honest about that limit. What it can do is reason about placement relative to likely task paths, and flag important content that sits in locations (sidebars, ad-shaped slots, the margins) where goal-focused users tend to filter it out. So Kweri raises attention risks based on position and styling, while being clear that true visibility depends on the user's intent, which only testing with real users can confirm.
FAQ
What is selective attention?
Selective attention is the mind's ability to focus on information relevant to the current goal while filtering out everything else. In design, it means users in task mode actively ignore elements they don't expect to need, regardless of prominence.
Why do users miss prominent elements?
Because attention is goal-driven, not prominence-driven. If an element falls outside the user's current 'attention tunnel' — what they're focused on achieving — they can look straight past it, even when it's large or central.
What is the invisible gorilla experiment?
A study by Daniel Simons and Christopher Chabris in which viewers counting basketball passes failed to notice a person in a gorilla suit walking through the scene. It's a famous demonstration of selective attention and inattentional blindness.
How is selective attention related to banner blindness?
Banner blindness is a specific case of selective attention: users filtering out anything that looks like an advert. Both stem from the mind suppressing content it judges irrelevant to its current goal.
How do I make important content more likely to be seen?
Place it where the user's task naturally leads, and connect it to what they're actively looking for. Relevance and position on the goal path matter more than size or colour — shouting from the margins rarely works.
Related principles
People have learned to ignore anything that looks like an ad — even when it isn't one.
People miss changes that happen outside their current focus of attention.
Movement, contrast, and faces in the periphery capture attention automatically — before conscious decision-making kicks in.
Attribution & sources
Identified by Cognitive psychology (Simons & Chabris and others). Catalogued from Laws of UX (Jon Yablonski).
A foundational attention concept, famously demonstrated by Simons and Chabris's 'invisible gorilla' study; popularised for designers by Jon Yablonski's Laws of UX.
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