Cognitive psychology

The cognitive psychology entries 51

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  Cognitive load

  The mental effort needed to complete a task. Too much and people slow down, make mistakes, or stop.

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  Mental model

  The mental picture someone holds of how something works. When the interface aligns with it, things feel intuitive; when it doesn’t, they feel broken.

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  Recognition vs recall

  Recognising something you’re shown is easier than recalling it from scratch. Good interfaces give you choices - menus, icons, recent items, autocomplete - instead of forcing you to remember and type from nothing.

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  Serial position effect

  When recalling a list, items at the beginning and end are remembered more easily than those in the middle. It’s not what’s on the list, but where it sits, that influences memory.

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  Chunking

  Chunking is how the brain groups individual pieces of information into meaningful units - like turning twelve digits into three sets of four. The chunk is the unit, not the items within it.

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  Von Restorff effect

  When one item in a group stands out, it’s more likely to be remembered. Its uniqueness acts as a memory cue: the odd one out captures attention, whether it wants to or not.

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  Change blindness

  We often miss changes that happen during a flicker, reload, or blink. Without a smooth motion cue, even obvious updates can slip past us until we notice them consciously.

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  Selective attention

  Selective attention means your mind focuses on what you’re actively looking for and tunes out everything else - even obvious things right in front of you. When deeply focused, you’ll often miss the most noticeable item on screen.

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  Choice overload

  Large choice sets can slow decisions or reduce satisfaction, especially when options are complex, unfamiliar, or poorly differentiated; the effect varies by context and is typically small and inconsistent.

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  Gulf of execution and evaluation

  Two gaps exist between a person and a system. The gulf of execution is the space between knowing your goal and figuring out how to achieve it - 'I know what I want, but how do I make this work?'. The gulf of evaluation is the space between the system acting and you understanding what happened - 'I did something, but did it work?'. Good design narrows both; bad design leaves you stranded on either side.

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  Norman's seven stages of action

  Norman's seven stages of action divide a single interaction into the mental steps you actually go through: set a goal, plan, specify and carry out the action, then perceive, interpret and compare the result. They turn the two gulfs - execution and evaluation - into a cycle, giving designers a clear checklist of seven distinct points where an interface can help or fail.

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  Conceptual model

  A conceptual model is the story a design tells about how it works - the model of the system that its appearance, labels and behaviour project to the user. People build their own mental model from that "system image", so when the design communicates a clear, accurate model, people use it correctly; when it implies the wrong one, they form mistaken beliefs and misuse it with total confidence.

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  Mapping

  Mapping is the connection between a control and what it affects. Natural mapping occurs when that link is so clear you don’t need to think. When controls are placed like the things they operate - such as a stove where each knob aligns with its burner - users get it right first time. When the layout contradicts the arrangement, they guess, get it wrong, and memorise a workaround.

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  Constraints

  Constraints are design limits that stop users from taking wrong actions, making the right choice the easiest path. Instead of telling users what to do and hoping they follow, you remove the option to act incorrectly - like a connector that fits only one way, a field that rejects invalid input, or a submit button that stays disabled until valid - so entire classes of error can’t occur.

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  Zeigarnik effect

  We remember - and are drawn back to - tasks we've started but not finished. An open loop lingers in working memory, pulling attention until it's closed; once completed, the mind lets it go.

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  Availability heuristic

  The availability heuristic is a mental shortcut where you assess how likely or common something is based on how readily examples come to mind. Vivid, recent, or frequently repeated things feel more common than they are - so it’s your memory of what you’ve seen, not reality, that shapes your sense of likelihood.

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  Peak-end rule

  We remember an experience mostly by its most intense moment (its peak) and how it ended, rather than by the average of every step - and we tend to ignore how long it lasted.

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  Halo effect

  The halo effect is when one positive trait - often appearance - unfairly influences how we judge unrelated qualities. A well-designed interface feels more trustworthy and easier to use, even if it’s functionally identical to a plain one, because its polish casts a glow over everything else. This is the engine behind the aesthetic-usability effect, and it’s double-edged: a polished surface buys goodwill and forgiveness, but it can also hide real flaws - yours and others’. Earn the halo with real quality, and don’t let a shiny veneer stop you from scrutinising substance.

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  Decision fatigue

  After sustained, effortful decision-making, people may shift towards defaults, avoidance or lower-effort choices - though the effect and its mechanisms vary a lot by setting and the evidence is mixed.

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  Priming

  Priming is how an earlier signal quietly shapes how you interpret what comes next. Once an idea, mood or word is activated in your mind, related things become easier to notice and lean your reading that way - so the same message, price or product can land quite differently depending on what you saw just before it.

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  Endowment effect

  The endowment effect is how owning something - even briefly or just feeling like you own it - makes you value it more than you would if you didn’t. The price you’d accept to give it up is usually higher than what you’d have paid to get it, simply because now it’s yours.

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  IKEA effect

  The IKEA effect is the way putting your own effort into something makes you value it more - often more than an identical thing you didn't build. The work you invest gets folded into how good the result feels, so a wobbly shelf you assembled can feel worth more to you than a flawless one bought ready-made.

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  Cognitive dissonance

  Cognitive dissonance is the mental discomfort from holding conflicting beliefs or actions - like a choice and its downsides - and the mind’s tendency to ease that tension by adjusting one of them. Rather than stay stuck in the unease, people shift their attitudes to match what they’ve done, so behaviour ends up reshaping belief.

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  Bandwagon effect

  The bandwagon effect is the tendency to do, like or believe something simply because many others already do. As a choice gains followers, it becomes more appealing just for that reason - popularity reinforces itself. People join partly because the wagon is already full.

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  Inattentional blindness

  Inattentional blindness means missing something obvious because your attention is focused elsewhere. When you’re concentrating on one thing, even large, clear elements - like banners or alerts - can go unnoticed, since seeing requires attention, not just open eyes.

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  Curiosity gap

  The curiosity gap is that itch you feel when you’re shown something you don’t know but are close to understanding. It pulls you in because you want to close the gap - which is why good teasers, subject lines, or ‘see why’ links are so hard to ignore.

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  Information scent

  Information scent is how strongly a link or label hints that it leads to what you're after. Like an animal following a trail, people follow the cues that smell most like their goal - so clear, goal-matching labels pull them confidently forward, while vague ones leave them sniffing around, unsure which way to go.

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  Habituation

  Habituation is how repeated, unchanged signals gradually stop registering. The first time something appears, you notice it; by the tenth identical time, your brain has learned it carries no new information and quietly tunes it out - which is good for ignoring noise, but bad when the thing you’ve learned to ignore is your warning.

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  Planning fallacy

  The planning fallacy is our habit of underestimating how long things will take and how much they'll cost, even when we know similar tasks have run over before. We picture the smooth, best-case version and quietly leave out the interruptions, rework and surprises that always show up - so the plan is optimistic almost by default.

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  Hyperbolic discounting

  Hyperbolic discounting shows how a reward feels much less valuable the longer you wait for it - not steadily, but sharply in the near term. The pull of 'now' is so strong that a smaller immediate reward often beats a bigger one later, and our preferences flip depending on whether the wait starts today or far in the future.

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  Satisficing

  Satisficing is choosing the first option that's good enough rather than searching for the best one. Instead of weighing everything to maximise, people set a rough bar and take the first thing that clears it - which is usually the smart move, because the effort of finding the perfect choice rarely pays for itself.

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  Spotlight effect

  The spotlight effect is our tendency to think other people notice us - our mistakes, our appearance, our small slip-ups - far more than they actually do. Because we're the centre of our own attention, we badly overestimate how much of a spotlight is really on us, when most people are too busy with their own concerns to notice.

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  Labour illusion

  The labour illusion is how visible effort makes a result feel more valuable and trustworthy - even when the wait is unnecessary. When a system shows its work - like 'searching 200 sites…' or 'checking 14 banks…' - people often judge the outcome more positively than if it arrived instantly, because the effort suggests care and thoroughness.

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  Barnum-Forer effect

  The Barnum-Forer effect is our tendency to accept vague, general statements as surprisingly accurate self-portraits. Phrases like 'you crave approval but are harshly self-critical' feel personal because we supply our own context, noticing the matches while ignoring the misses.

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  Curse of knowledge

  The curse of knowledge is the difficulty experts have imagining what it's like not to know what they know. Once something is obvious to you, you can't easily un-see it, so you overestimate how clear your explanations are and skip the very steps and terms a beginner needs - because to you they go without saying.

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  Banner blindness

  Banner blindness is the tendency to ignore elements that resemble advertisements. After years of scanning past flashy, boxed-off, brightly coloured promotional content, people have trained themselves to filter out those areas automatically - so much so that they’ll miss genuinely useful information if it happens to be styled like an ad.

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  Negativity bias

  Negativity bias is the way bad things weigh more heavily than good ones of the same size. A single harsh review, one error or one rude moment lands harder and lingers longer than several pleasant experiences - so it takes a lot of good to outweigh a little bad.

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  Picture superiority effect

  The picture superiority effect is the finding that we remember pictures far better than words. The same idea shown as a clear image is recognised and recalled more reliably, and for longer, than the idea written out - because pictures get encoded both as images and as meaning, giving memory two routes back to them.

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  Storytelling effect

  The storytelling effect is the way information wrapped in a story is understood, remembered and felt more strongly than the same information delivered as bare facts. A narrative gives facts a cause, a character and a sequence, so they stick together in memory and carry emotion that a plain list never does.

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  Schema

  A schema is a mental template built from past experience for how a kind of thing usually works - what a login form looks like, how a checkout flows, where the menu lives. We match new situations to these templates, so when an interface fits the schema people understand it instantly, and when it breaks the schema they're forced to stop and work it out.

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  Self-serving bias

  Self-serving bias is our habit of taking credit for successes and blaming something external for failures. When things go well it's down to our skill and effort; when they go badly it's bad luck, other people or the circumstances - a tidy accounting that protects our self-esteem but distorts what we learn.

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  Spacing effect

  The spacing effect is the finding that we remember things far better when study is spread out over time than when it's crammed into one session. The same total effort, distributed across days, builds much more durable memory than the same minutes done all at once - which is why last-minute cramming fades so fast.

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  Empathy gap

  The empathy gap is how poorly we predict behaviour - our own and others’ - across different emotional or physical states. When calm, we can’t really feel how we’ll act when stressed, rushed, hungry or angry, so our ‘cold’ selves consistently underestimate how much a ‘hot’ state changes what we do.

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  Centre-stage effect

  The centre-stage effect is our tendency to favour the option in the middle of a row. Faced with a line of similar choices, people disproportionately pick the central one - partly assuming it's the most popular or the intended default - so position alone, not merit, nudges the decision.

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  Time perception

  Time perception (chronoception) is how long something feels, which often differs from its actual duration. A wait feels longer when you’re idle and unsure, and shorter when you’re busy and know what’s happening - so the felt duration, not the clock, shapes how people judge an experience.

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  Flow state

  Flow is the state of complete, energised absorption in a task - "being in the zone" - where action feels effortless and time disappears. It happens in the sweet spot where the challenge of what you're doing is well matched to your skill: hard enough to engage you fully, not so hard that you're anxious or so easy that you're bored.

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  Hawthorne effect

  The Hawthorne effect is the way people change their behaviour when they know they're being watched. Under observation we tend to try harder, follow the rules more closely and act how we think we should - so what you observe isn't quite what people do when no one is looking.

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  Method of loci

  The method of loci, or memory palace, is a technique for remembering a list by mentally placing each item at a spot along a familiar route - rooms of your home, say - then "walking" the route to recall them in order. It works by hijacking our strong memory for places and spatial journeys to carry information that would otherwise be hard to hold.

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  Hick's law vs Miller's law

  Hick's law predicts how decision time rises as choice or uncertainty increases; Miller's law concerns immediate-memory capacity. Neither gives a universal limit for the number of menu items.

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  Confirmation bias

  Confirmation bias is the pull to notice, trust and remember whatever fits what you already believe - and to wave away whatever does not. It quietly turns research into a hunt for "yes" rather than an honest test of "is this true?".

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  Dunning-Kruger effect

  People with low skill in a domain may overestimate their performance, partly because the knowledge needed to perform well also helps you judge performance. The size and shape of the effect - and how much is measurement or regression artefact - remain debated.

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