Weber’s Law
JND depends on ratio between stimulus magnitude and magnitude of the original stimulus
Weber’s law (also known as Weber-Fechner law or Weber’s-Fechner’s law) is a fundamental principle in the field of psychology, specifically in psychophysics. The law states that the perceived difference between two stimuli is proportional to the magnitude of the stimuli. In other words, the greater the magnitude of a stimulus, the greater the change in that stimulus must be for an individual to detect the difference.
For instance, if a person is holding a small weight of 1 kilogram, they would be able to detect a difference of 100 grams as a noticeable change. However, if the person is holding a weight of 100 kilograms, it would take a change of 10 kilograms before they would be able to detect the difference. This means that larger stimuli require larger changes to be perceived as different.
Weber’s law applies to a variety of sensory modalities including vision, hearing, and touch. It has several practical applications in many fields, such as manufacturing, marketing, and economics.
Overall, Weber’s law highlights how perception is influenced by changes in the physical world and can help explain some of the limitations of human sensory abilities.
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