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The Weber–Fechner laws are two related scientific laws in the field of psychophysics, known as Weber's law and Fechner's law. Both relate to human perception, more specifically the relation between the actual change in a physical stimulus and the perceived change.
Weber's law has important applications in marketing. Manufacturers and marketers endeavor to determine the relevant JND for their products for two very different reasons: so that negative changes (e.g. reductions in product size or quality, or increase in product price) are not discernible to the public (i.e. remain below JND) and
Ernst Heinrich Weber (24 June 1795 – 26 January 1878) [1] was a German physician who is considered one of the founders of experimental psychology.He was an influential and important figure in the areas of physiology and psychology during his lifetime and beyond.
In psychophysics, sensory threshold is the weakest stimulus that an organism can sense.Unless otherwise indicated, it is usually defined as the weakest stimulus that can be detected half the time, for example, as indicated by a point on a probability curve. [1]
Gustav Theodor Fechner (/ ˈ f ɛ x n ər /; German:; 19 April 1801 – 18 November 1887) [1] was a German physicist, philosopher, and experimental psychologist.A pioneer in experimental psychology and founder of psychophysics (techniques for measuring the mind), he inspired many 20th-century scientists and philosophers.
It is often considered to supersede the Weber–Fechner law, which is based on a logarithmic relationship between stimulus and sensation, because the power law describes a wider range of sensory comparisons, down to zero intensity. [1] The theory is named after psychophysicist Stanley Smith Stevens (1906–1973).
Psychophysics quantitatively investigates the relationship between physical stimuli and the sensations and perceptions they produce. Psychophysics has been described as "the scientific study of the relation between stimulus and sensation" [1] or, more completely, as "the analysis of perceptual processes by studying the effect on a subject's experience or behaviour of systematically varying the ...
Location – the stimulus was presented to an area of the right eye where there is a high density of rod cells, 20 degrees to the left of the point of focus (i.e. 20 degrees to the right of the fovea). Roughly this degree of eccentricity (about 20 degrees) has the highest rod density across the whole retina.