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Minimising Cognitive Load To Improve Conversions

The Psychology of  Cognitive Load:

When seeking to improve conversion on a website it is essential to understand how visitor behaviour is heavily influenced by emotional impulses and sometimes appears irrational. People often react before thinking which is why having intuitive design and a clear visual hierarchy is so key.

Visual design matters because there is no such thing as a neutral design. It may be the imagery on the landing page, the familiarity of games, or the tone of voice used to encourage sign-up. Potentially everything we display can affect how visitors respond.

We know that people use their intuitive, largely automatic and unconscious mind, to make most of their daily decisions. Our intuitive mind is fast and impulsive because it employs rules of thumbs (heuristics), such as stereotypes. It also jumps to conclusion to minimise cognitive effort. Some of the key short-cuts that our mind uses are:

  • The affect heuristic: Where people allow their likes and dislikes to determine their beliefs about a subject or person. This often occurs because our emotional response (e.g. attitude towards the activity) will heavily influence a person’s beliefs about the benefits and risks. Thus, if someone likes to play poker they will generally overestimate their chances of winning and be more willing to play online or offline.


  • The availability heuristic: We judge the frequency of an occurrence by the ease with which instances come to mind. This is heavily influenced by the ease of recall and the number of instances we remember. People who like to be guided by their intuition are more susceptible to this bias. Thus gaming sites often display a live stream of recent winners to demonstrate the size and frequency of wins.

Recent winners image from gambling website

  • Availability and affect heuristic: People’s perceptions of the likelihood of an event occurring are distorted by the frequency and emotional intensity of messages they see. Thus a story that is repeatedly seen will be perceived to be more likely to occur again if it conveys real human emotions rather than sticking to the facts.
  • We are a social animal and so we love to hear about how people respond to events and how it may change them as a person. Indeed, social scientists have found that rich and vivid imagery of rare events (e.g. a jackpot win) also makes people less sensitive to the probability of it occurring again. Insurance companies use this to their advantage when selling accidental death cover. Very few people die from accidents as most deaths are the result of natural causes.


Vivid image of life for jackpot winner from Betfred.comSource:

Cognitive Effort:

When we need to undertake mental activities that require concentration and control, such as complex calculations, our intuitive self activates our slower, more conscious mind. Our slow mind is also activated when something is detected that doesn’t fit in with our model of the world that our fast mind maintains (e.g. something appears too good to be true).

This is why people often shun offers that are perceived to be too generous. People become cynical and assume there must be a catch. So don’t give away too much or reduce prices well below the competition as it may be counter-productive.

Much of the time our slow mind will confirm what our intuitive mind tells it as we don’t like to experience internal conflict. However, our conscious mind is also activated when we need to:

  • Simultaneously manage multiple ideas in our memory that need separate actions or have to be combined using a rule. Only our slow mind can deal with rules, compare items on several levels and deliberately choose between multiple options.
  • Processing statistical information. JC Penney discovered to its cost that people don’t like to calculate how much they may be saving. Mental maths uses lots of cognitive energy and humans are generally lazy when it comes to maths.
  • Instruct our memory to override habitual responses. When driving it is difficult to stop yourself putting your foot on the brake when you skid on ice or oil.
  • Using self-control to resist temptations or maintain a coherent train of thought.

The paradox here is that when our slow, conscious, mind is engaged in dealing with a challenging cognitive computation we are more likely to give into temptation. So don’t have a bag of sweets with you when you are playing a skill-based game if you want to have any left for later.

“If there are several ways of achieving the same goal, people will eventually gravitate to the least demanding course of action. In the economy of action, effort is a cost, and the acquisition of skill is driven by the balance of benefits and costs. Laziness is built deep into our nature.” Daniel Kahneman from Thinking, fast and slow.

Cognitive Strain:

Indeed and our slow mind has limited capacity. Concentration and computations quickly depletes our reservoir of mental energy resulting in mental overload. Our slow mind responds to this by focusing solely on the most important activity. When this occurs we can become completely blind to other stimuli. The case of the gorilla walking across the basketball court is a frequently quoted example.

On a website mental overload can result in visitors failing to see the primary call to action or an error message that informs them about a non-responsive user interface.  Fortunately for website designers as people become more adept at a task the energy required diminishes. This means we can allocate more resource to other activities and we notice more content on a site. However, this is of little help to the first time visitor and is another reason why unnecessary content can kill conversion.

A key trigger for our slow mind taking control over our decision making is cognitive strain. This can be caused by a number of factors including:

  • Instructions being in too small a font (not everyone has a large screen or good vision)
  • Poor contrast between the copy and the background
  • Jargon and unfamiliar words.
  • If we are frowning because we are in bad mood or have been irritated by not being able to find the information we are looking for we can also experience cognitive strain.

Low-contrast text image


So, why does this matter? Well, if we are suffering from cognitive strain this can create friction and we are generally:

  • More careful and suspicious about an activity (too good to be true?)
  • Pay more attention and scrutinize the content more than usual
  • Feel less comfortable and certain about the nature of the content
  • Make fewer errors  as we rely on our intuition less
  • Are less creative and thus less responsive to creative content (not good for gaming!)

The danger here is that cognitive strain creates sufficient uncertainty and negative feelings about a site (i.e. friction)  that visitors will not feel comfortable enough to sign up or make a transaction. It is human nature to avoid uncertainty because it makes us feel uncomfortable.  This is partly why site security and trust is so important to website visitors.

On the positive side cognitive ease can assist conversion by making content appear more familiar and so visitors are more willing to consider signing up or making a transaction.

Cognitive ease model image

So what other factors can result in cognitive strain that we need to avoid when designing a web page?

Asking visitors to switch from one task to another (i.e. multi-tasking). Have a clear hierarchy of calls to actions and keep distractions, such as requests for information, to a minimum.

Time pressure. Some sense of urgency can encourage visitors to complete a task. However, be careful not to give visitors so little time that they feel pressurised or the site times-out while they are looking for information you have asked them for. You will just annoy customers and they will probably go elsewhere.

Asking for too much information at once. Divide tasks, such as sign-up, into smaller, easy steps.

Difficult to pronounce words. Easily pronounced words evoke positive feelings whilst the opposite is true with words that we have difficultly saying.

Unfamiliar ideas or words. If something is unfamiliar we are more suspicious and critical of it. Due to associations in our memory people are generally more accepting of familiar ideas and phrases.  Avoid using jargon or technical terms as you will frighten off novice players who don’t understand what the terms mean. Similarly repetition leads to cognitive ease because it results in a feeling of comfort and familiarity.

Mood. As mentioned above if we are in a bad mood we are prone to cognitive strain. However, websites can counter this problem by using humour in their content. Experiments by social scientists have shown that smiling can lead to cognitive ease.

Choices involving trade-offs that create conflict. Asking people to make choices that involve trading-off attributes (e.g. two different welcome packages), that lack a compelling reason to select either option creates conflict and makes decision making difficult. Emotionally it is not pleasant as it forces us to think about opportunity costs and the losses implicitly involved. Introducing a third, noticeably inferior option, provides a comparison that makes it easier for people to make decisions.

Too many options. We are often told giving people choice is good for people. Unfortunately as the number of alternatives that we offer people increase so also the positive features associated with the discarded options accumulate. People find it difficult to forget about the rejected options and choice almost always involves giving something up of value. Research indicates that shoppers who are shown a larger display are less likely to buy. Further, evidence suggests that the cumulative opportunity cost of having increased choice can result in reduced levels of satisfaction with a purchase.

5 product offerings from image


A key insight from this is that cognitive ease is a cause of feeling good, but also a consequence. Feeling good also leads to us to be more confident that we understand information and to judge content as truthful. The opposite is true with cognitive strain and not surprisingly decisions that create discomfort lead to indecision.

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Further reading: 



Thinking, Fast and Slow


The Paradox of Choice: Why More Is Less (P.S.)

  • Neal has had articles published on website optimisation on  and as an ex-research and insight manager on the GreenBook Blog research website.  If you wish to contact Neal please send an email to You can follow Neal on Twitter @northresearch, check out the Conversion Uplift  Facebook page or connect on LinkedIn.

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