What is the Weber-Fechner law bias?
The Weber-Fechner law is a cognitive bias that makes people believe that the changes in our senses are proportional to the initial stimulus.
Why this bias is dangerous?
This cognitive bias can cause disasters if we have a control system based on it, because small variations in the input data will generate large variations in the output data.
For example: If a nuclear power plant has a sensor measuring temperature and a circuit based upon that input which controls the temperature of water being circulated through the reactor core, then any slight increase or decrease from normal temperature will lead to significant problems for everyone, as well as causing potential damage to resources and people near it. This may be especially problematic with systems designed to respond accurately to smaller changes.
Why do people use this bias?
This cognitive bias is used because it is easy to understand, and therefore easy to remember. This makes it very intuitive for experienced professionals. It also provides people with a sense of control over their sensory environment.
How do people use this bias?
People often expect the changes in our senses to be proportional to the initial stimulus. For example: The weight will feel lighter if we remove 10 % of the load, or heavier if we add 10% additional weight.
The reason behind it can be explained by Weber’s law which describes that “the just-noticeable difference between two stimuli is a constant fraction of the original stimulus”.
It means that when something increases/decreases by 1%, we can notice it more than if it increases/decreases the same amount again the next time.
How can we create this bias?
We can use many strategies to increase this cognitive bias. For example: We can use knowledge of Weber-Fechner law in advertising campaigns for promoting products, or by making people believe that some activity will be of greater benefit than another.
Another great strategy is telling people that they are changing something very slowly and gradually until they reach a desirable result. It gives them confidence that whatever they do, everything will be okay at the end..Many people fall under this trap because it seems rational according to their common sense about how our senses work.
An effective way to create this bias is by using examples that show people how Weber-Fechner law works in natural world.
For example: This principle is used in audio mastering during sound recording and audio levels, where the human ear hears louder sounds as brighter due to the principle of Fechner’s Law.
Examples of Weber-Fechner law:
1) People tend to believe that they are getting better at things the longer they invest in them.
2) The time it takes to recognize a difference between two stimuli is directly proportional to the magnitude of the intensity of those stimuli.
3) The game Pokémon Go has an extensive tutorial before starting, which seems like forever but quickly becomes irrelevant as you grow accustomed to the game.
4) If you are an amateur tennis player, playing against Wimbledon champion is probably discouraging because you will expect yourself to lose and play not that well. The same thing can happen if you buy a new TV and don’t like the sound it makes.
Which profession use the Weber-Fechner law bias?
There are many professions that use this cognitive bias to fool their clients into thinking what they do is legit or special. For example: Psychiatrists regulate your brain chemicals without having an evidence that it can actually work.
Another great example is artists tell you how much time they spent on painting your picture, but they don’t tell you that all of the work is behind the scene before this final product is created.
Weber-Fechner law conclusion.
As we can see it’s very easy for us to get caught under this bias if we don’t know exactly how it works or what are its effects. It’s good to be aware of strategies that would create this cognitive bias so we can avoid them in our life.