What is Weber-Fechner´s Law?

Also known as the sensory-perception law, it states that sensory response to external stimuli (temperature, light, sound, etc.) is not proportional to the intensity of the stimulus. Where the intensity of the stimulus is very high, our senses self-adjust so as to only detect enormous differences, whereas when the intensity of the stimulus is very low, they adjust so as to amplify the smallest possible differences. In marketing, this implies that consumers do not always perceive variations in the pricing of a product or service. It depends on the size of the change. In user experience, this provides information, for example, on response times in interactions between the user and the systems.

 
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