Weber's law

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Noun1.Weber's law - (psychophysics) the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus; "Weber's law explains why you don't notice your headlights are on in the daytime"
law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"
psychophysics - the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effects
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That same trend, described by what's called Weber's law, shows up in humans' nonverbal approximate number system as well as in those of other animals.
This paper proposes a new contour-based shape descriptor, called Weber's Law Shape Descriptor (WLSD).
Among other things, Sense of Touch describes Weber's influential two-point discrimination test and provides the fullest description of what came to be known as Weber's Law.
Note that, based on considerable basic psychophysical research, Weber's law states that difference thresholds are a constant proportion of the original stimulus (Kling & Riggs, 1971).